Consider the following statements regarding Kutch and Saurashtra Mesozoic Sedimentary Sequences:
1. The Mesozoic sedimentary sequences of Kutch are primarily represented by the Patcham, Chari, Katrol, and Bhuj formations, spanning from the Middle Jurassic to the Early Cretaceous period.
2. The Bhuj Formation represents the youngest Mesozoic sequence in the Kutch basin and is characterized by thick sequences of marine shales deposited during the late Cretaceous period.
3. The Dhrangadhra Formation in Saurashtra is composed of extensive marine limestone deposits that correlate with the Callovian stage of the Middle Jurassic found in the Kutch mainland.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is correct because the Kutch Mesozoic stratigraphy is indeed categorized into the Patcham, Chari, Katrol, and Bhuj formations, representing a continuous depositional history from the Middle Jurassic to the Early Cretaceous. Statement 2 is incorrect because the Bhuj Formation is primarily composed of fluviatile and deltaic sandstones, not marine shales, and it dates to the Early Cretaceous rather than the late Cretaceous. Statement 3 is incorrect because the Dhrangadhra Formation consists mainly of terrestrial and deltaic sandstones and shales, and it is chronostratigraphically correlated with the older Patcham and Chari formations, not specifically the Callovian marine limestone stage.
Consider the following statements regarding Vindhyan Supergroup Stratigraphy and Lithology:
1. The Vindhyan Supergroup is broadly divided into the Lower Vindhyan and Upper Vindhyan sequences, separated by a significant unconformity.
2. The Kaimur Group, which forms the basal unit of the Upper Vindhyan, is primarily composed of massive sandstones and quartzites.
3. The Rewa Group is characterized by the presence of diamond-bearing kimberlite pipes, which are exploited for industrial diamonds in the Panna region.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is incorrect.
The Vindhyan Supergroup is divided into Lower and Upper sequences by a major unconformity representing a significant hiatus in deposition, and the Kaimur Group indeed serves as the basal unit of the Upper Vindhyan, consisting largely of mature sandstones and quartzites. Statement 3 is incorrect because diamond-bearing kimberlite pipes are associated with the Majhgawan volcanic pipe, which intrudes into the Kaimur Group, whereas the Rewa Group itself is primarily composed of shales and sandstones rather than being the source of the kimberlite pipes.
Consider the following statements regarding Dharwar Craton Metallogenic Provinces:
1. The Kolar Gold Field, located in the Eastern Dharwar Craton, is hosted within the Neoarchean greenstone belts composed of amphibolite-facies metavolcanic rocks.
2. The Sargur Group represents the oldest supracrustal sequence in the Dharwar Craton, with zircon U-Pb ages dating back to approximately 3.3 billion years.
3. The Dharwar Craton is divided into the Western Dharwar Craton and the Eastern Dharwar Craton, separated by the Chitradurga Shear Zone.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
All three statements are correct: the Kolar Gold Field is hosted in Neoarchean amphibolite-facies rocks of the Eastern Dharwar Craton, and the Sargur Group is geologically established as the oldest supracrustal sequence with zircon U-Pb ages reaching approximately 3.3 billion years. Furthermore, the Dharwar Craton is structurally bifurcated into the Western and Eastern blocks by the prominent Chitradurga Shear Zone, which serves as a major crustal boundary.
Consider the following statements regarding Archaean Gneissic Complexes and Cratonic Nuclei:
1. The Bundelkhand Craton is primarily composed of massive granitic batholiths and is considered a stable continental nucleus that has remained largely unaffected by major tectonic deformations since the Proterozoic era.
2. The Bastar Craton, also known as the Bhandara Craton, consists of a complex assembly of tonalite-trondhjemite-granodiorite (TTG) gneisses and supracrustal rocks known as the Bengpal and Bailadila groups.
3. The Sargur Group of rocks in the Dharwar Craton serves as a key lithostratigraphic unit, consisting of high-grade metamorphic rocks such as pelitic schists, quartzites, and banded iron formations.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
The Bundelkhand Craton is a classic example of a stable Archaean nucleus dominated by granitic batholiths that stabilized around 2.5 billion years ago. The Bastar Craton, often linked with the Bhandara Craton, is characterized by its TTG suite and the distinct iron-rich supracrustal sequences of the Bengpal and Bailadila groups. The Sargur Group represents the oldest high-grade metamorphic basement in the Dharwar Craton, providing critical evidence of early crustal evolution through its distinct lithological association of pelitic schists and banded iron formations.
Consider the following statements regarding Cuddapah Basin Sedimentation Cycles:
1. The Gandikota Quartzite is a member of the Kurnool Group and serves as the primary marker horizon for identifying the boundary between the Cuddapah and the underlying Dharwar craton.
2. The Cuddapah Basin is characterized by a thick sequence of Proterozoic sedimentary rocks, with the Papaghni Group representing the oldest cycle of deposition unconformably overlying the Archaean basement.
3. The sedimentation within the Cuddapah Basin shows a uniform thickness across its entire extent, with the eastern margin being dominated by undisturbed horizontal limestone beds.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 2 is correct. Statement 1 is incorrect. Statement 3 is incorrect.
Statement 2 is correct because the Cuddapah Basin contains Proterozoic sedimentary sequences where the Papaghni Group represents the initial depositional cycle unconformably resting on the Archaean basement. Statement 1 is incorrect because the Gandikota Quartzite belongs to the Chitravati Group (Cuddapah Supergroup), not the Kurnool Group, and the Great Eparchaean Unconformity separates the Cuddapah rocks from the underlying Dharwar craton. Statement 3 is incorrect because the basin exhibits significant lateral variations in thickness and facies, and the eastern margin is characterized by intense deformation, folding, and thrusting rather than undisturbed horizontal beds.
Consider the following statements regarding Aravalli-Delhi Fold Belt Tectonic History:
1. Geochronological studies indicate that the main phase of the Delhi Orogeny occurred approximately between 1.7 and 1.4 billion years ago during the Mesoproterozoic era.
2. The Banded Gneissic Complex serves as the basement for the Aravalli sequence, and its metamorphic grade reflects the intense thermal activity associated with the Himalayan Orogeny.
3. The Delhi Supergroup, which constitutes the younger sequence of the Aravalli-Delhi Fold Belt, is characterized by the presence of the Alwar and Ajabgarh Groups.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 3 is correct. Statement 2 is incorrect.
Statement 1 is correct as the Delhi Orogeny is well-documented in the Mesoproterozoic era (approx. 1.7-1.4 Ga), while Statement 3 is correct because the Delhi Supergroup is stratigraphically divided into the older Alwar Group and the younger Ajabgarh Group. Statement 2 is incorrect because, although the Banded Gneissic Complex is the basement for the Aravalli sequence, its metamorphic history is related to the Proterozoic Aravalli-Delhi orogenic cycles, not the Himalayan Orogeny, which is a much younger Cenozoic event.
Consider the following statements regarding Siwalik Group Molasse Deposits:
1. These molasse deposits are primarily composed of fluvial sediments, including sandstone, siltstone, shale, and conglomerate, derived from the rising Himalayan mountain range.
2. The Siwalik Group represents a thick sequence of Cenozoic sedimentary deposits that accumulated in the Himalayan foreland basin during the Miocene to Pleistocene epochs.
3. Lithologically, the Siwalik sequence is divided into three units: the Lower Siwalik (Chinji Formation), the Middle Siwalik (Nagri and Dhok Pathan Formations), and the Upper Siwalik (Tatrot and Pinjor Formations).
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
The Siwalik Group consists of syn-orogenic fluvial sediments (sandstone, siltstone, shale, and conglomerate) eroded from the rising Himalayas, confirming Statement 1. These deposits accumulated in the Himalayan foreland basin between the Miocene and Pleistocene epochs as a direct result of the ongoing continental collision, validating Statement 2. Statement 3 is accurate as the Siwalik sequence is lithostratigraphically categorized into the Lower (Chinji), Middle (Nagri and Dhok Pathan), and Upper (Tatrot and Pinjor) formations based on distinct fossil assemblages and sediment characteristics.
Consider the following statements regarding Craton-Mobile Belt Interaction in Central India:
1. The Betul Belt is situated between the Sausar and Mahakoshal groups and is primarily composed of Archean granulites that represent the deepest exposed crustal section of the Central Indian Craton.
2. The Gavilgarh-Tan Shear Zone marks the northern limit of the Deccan Volcanic Province, separating the Paleozoic basement rocks of the Satpura range from the younger sedimentary basins of the Gondwana Supergroup.
3. The Mahakoshal Group consists of volcanic and sedimentary sequences deposited in a back-arc basin, which experienced intense deformation during the collision of the Dharwar Craton with the Singhbhum Craton at 2.5 billion years ago.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because the Betul Belt is a Proterozoic mobile belt, not an Archean granulite terrain, and it represents an island arc accretion rather than the deepest crustal section. Statement 2 is incorrect as the Gavilgarh-Tan Shear Zone is a major tectonic feature within the Satpura Mobile Belt, not the northern limit of the Deccan Volcanic Province, which is defined by the Narmada-Son Lineament. Statement 3 is incorrect because the Mahakoshal Group is a Paleoproterozoic sequence associated with the Central Indian Tectonic Zone (CITZ), and its deformation is linked to the collision between the Bundelkhand and Bastar cratons, not the Dharwar-Singhbhum collision.
Consider the following statements regarding Aravalli-Delhi Fold Belt Tectonic History:
1. The Marwar Supergroup unconformably overlies the Delhi Supergroup, and its depositional history is linked to the Hercynian orogeny that affected the northern Indian shield.
2. The Aravalli-Delhi Fold Belt is primarily composed of Archean volcanic rocks, and its structural grain was established during the formation of the Gondwanaland supercontinent 500 million years ago.
3. The Aravalli-Delhi Fold Belt represents a Proterozoic orogenic belt that evolved through the successive accretion of the Banded Gneissic Complex and the Marwar Craton.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 3 is correct. Statement 1 is incorrect. Statement 2 is incorrect.
Statement 3 is correct as the Aravalli-Delhi Fold Belt is a classic Proterozoic orogenic belt formed by the crustal accretion of the Banded Gneissic Complex and the Marwar Craton. Statement 1 is incorrect because the Marwar Supergroup is Neoproterozoic to early Cambrian in age, not linked to the Hercynian orogeny, which occurred much later in the Paleozoic. Statement 2 is incorrect because the belt is composed of Proterozoic sedimentary and volcanic sequences, and its structural grain was established during the Aravalli-Delhi orogeny (approx. 1.7-1.0 billion years ago), long before the formation of Gondwanaland.
Consider the following statements regarding Ophiolite Suites and Suture Zones of the Indus-Tsangpo:
1. Geophysical surveys indicate that the Moho discontinuity beneath the Indus-Tsangpo Suture Zone reaches a depth of 80 kilometers, reflecting the deep-seated subduction of the Indian lithospheric mantle.
2. The melange zones within the suture region contain exotic blocks of limestone and radiolarian chert, which originated in the continental shelf environments of the Gondwanan margin.
3. The Indus-Tsangpo Suture Zone (ITSZ) represents the tectonic boundary where the Indian Plate collided with the Eurasian Plate during the Eocene epoch, approximately 50 million years ago.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 3 is correct. Statement 1 is incorrect. Statement 2 is incorrect.
Statement 3 is correct as the ITSZ marks the major tectonic boundary formed by the collision of the Indian and Eurasian plates during the Eocene epoch (~50 Ma). Statement 1 is incorrect because the Moho depth beneath the Tibetan Plateau and ITSZ is typically around 70-75 km, and it reflects crustal thickening rather than deep-seated mantle subduction. Statement 2 is incorrect because the exotic blocks of limestone and radiolarian chert in the ophiolitic melange are remnants of the Tethyan oceanic crust and seamounts, not the continental shelf of the Gondwanan margin.
Consider the following statements regarding Craton-Mobile Belt Interaction in Central India:
1. The Aravalli-Delhi Mobile Belt extends eastward into the Son-Narmada North Fault, providing the primary structural link between the Bundelkhand Craton and the Singhbhum Craton during the Neoarchean era.
2. The Sausar Group, located within the southern part of the Central Indian Tectonic Zone, underwent high-grade regional metamorphism during the Satpura Orogeny approximately 1.0 to 0.9 billion years ago.
3. The Central Indian Tectonic Zone (CITZ) acts as a Proterozoic mobile belt that separates the Bundelkhand Craton in the north from the Dharwar and Bastar cratons in the south.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 2 is correct. Statement 3 is correct. Statement 1 is incorrect.
Statement 1 is incorrect because the Aravalli-Delhi Mobile Belt is located in northwestern India and does not extend into the Son-Narmada North Fault, which is a structural feature of the Central Indian Tectonic Zone (CITZ). Statement 2 is correct as the Sausar Group within the CITZ underwent high-grade metamorphism during the Neoproterozoic Satpura Orogeny (approx. 1.0-0.9 Ga). Statement 3 is correct because the CITZ serves as a major Proterozoic collisional suture zone that effectively divides the northern Bundelkhand Craton from the southern Dharwar and Bastar cratons.
Consider the following statements regarding Deccan Traps Flood Basalt Volcanism:
1. The Deccan Traps are primarily composed of acidic igneous rocks with high silica content, which formed during the tectonic collision between the Indian and Eurasian plates in the Eocene epoch.
2. The Rajmahal Traps in eastern India were formed by the same mantle plume activity as the Deccan Traps, occurring synchronously during the final stages of the Gondwana breakup in the Paleocene.
3. The Malwa Plateau represents the northernmost extension of the Deccan Traps, where the basaltic layers are interbedded with thick deposits of marine limestone formed during the Jurassic period.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because the Deccan Traps are composed of basaltic (mafic) rocks, not acidic, and formed due to the Reunion hotspot during the Cretaceous-Paleogene transition, not the Eurasian collision. Statement 2 is incorrect as the Rajmahal Traps are significantly older (Early Cretaceous) and associated with the Kerguelen hotspot, whereas the Deccan Traps are younger (Late Cretaceous/Paleocene). Statement 3 is incorrect because the Malwa Plateau consists of Deccan basalt, but it does not contain Jurassic marine limestone, as the traps formed much later and are largely terrestrial in origin.
Consider the following statements regarding Deccan Volcanic Province Petrology and Geomorphology:
1. The transition from the underlying Precambrian basement to the Deccan basaltic flows is marked by the presence of Intertrappean beds, which contain fossilized remains of marine invertebrates indicative of a deep-sea depositional environment.
2. The Western Ghats escarpment, or the Sahyadri range, represents the western edge of the Deccan plateau, where the basaltic layers reach a maximum thickness of over 2,000 meters near the Mumbai region.
3. The paleomagnetic studies of the Deccan Traps suggest that the eruptions occurred in three distinct pulses, with the largest volume of lava extruded during the early Eocene epoch as the Indian plate crossed the equator.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 2 is correct. Statement 1 is incorrect. Statement 3 is incorrect.
Statement 2 is correct because the Sahyadri escarpment marks the western limit of the Deccan Traps, with basaltic thickness exceeding 2,000 meters near the coast due to the proximity to the volcanic center. Statement 1 is incorrect because Intertrappean beds are primarily lacustrine or fluvial deposits containing freshwater fossils, not deep-sea marine invertebrates. Statement 3 is incorrect because the main phase of the Deccan volcanism occurred during the Late Cretaceous period (approximately 66 million years ago), not the Eocene epoch.
Consider the following statements regarding Deccan Volcanic Province Petrology and Geomorphology:
1. The formation of the Deccan plateau is associated with the northward drift of the Indian plate, which resulted in the creation of extensive columnar jointing patterns commonly observed in the granitic outcrops of the Vidarbha region.
2. The Mahabaleshwar formation represents the uppermost stratigraphic unit of the Deccan sequence, known for its high concentration of acidic rhyolitic flows that cover the majority of the northern Malwa plateau.
3. The Deccan Traps are classified as a Large Igneous Province that originated from the Reunion hotspot, which currently lies beneath the Mascarene Plateau and continues to generate active shield volcanoes in the central Indian craton.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because the Deccan Traps consist primarily of basaltic lava, not granite, and the columnar jointing is a feature of basaltic cooling, not granitic outcrops. Statement 2 is incorrect as the Mahabaleshwar formation is a middle-to-upper stratigraphic unit composed predominantly of tholeiitic basalt, not acidic rhyolite, and rhyolitic flows are localized rather than covering the Malwa plateau. Statement 3 is incorrect because while the Deccan Traps originated from the Reunion hotspot, the hotspot is currently located beneath the Reunion Island in the Indian Ocean, not the central Indian craton, and it does not generate active volcanoes within the Indian landmass.
Consider the following statements regarding Aravalli-Delhi Fold Belt Tectonic History:
1. The Aravalli Craton underwent significant crustal thickening during the assembly of the Columbia supercontinent, which influenced the structural evolution of the Delhi Fold Belt.
2. The South Delhi Fold Belt is characterized by the presence of ophiolitic rocks, suggesting the closure of a paleo-oceanic basin during the Proterozoic tectonic cycle.
3. The Great Boundary Fault marks the tectonic contact between the Vindhyan Supergroup and the older rocks of the Aravalli-Delhi Fold Belt in the southeastern region of Rajasthan.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
Statement 1 is correct as the Aravalli-Delhi Fold Belt (ADFB) experienced major orogenic events around 1.7-1.6 Ga, coinciding with the assembly of the Columbia supercontinent. Statement 2 is correct because the South Delhi Fold Belt contains mafic-ultramafic suites, including serpentinites, which are diagnostic indicators of ancient oceanic crust closure during the Proterozoic. Statement 3 is correct as the Great Boundary Fault (GBF) is a major tectonic feature extending over 400 km, acting as a structural interface that separates the Proterozoic Vindhyan sediments from the older Aravalli-Delhi basement rocks.
Consider the following statements regarding Geological Evolution of the Shillong Plateau:
1. Geological surveys indicate that the Tura Formation, located in the western part of the plateau, represents a marine transgression that occurred during the late Jurassic period, preceding the deposition of the Sylhet Trap volcanics.
2. The Dauki Fault is a strike-slip feature that facilitated the lateral movement of the plateau towards the east, effectively connecting the Shillong massif to the Arakan Yoma fold belt during the Miocene epoch.
3. The plateau is composed primarily of Precambrian crystalline rocks, including granites and gneisses, which correlate geologically with the Chota Nagpur Plateau of the Indian Shield.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 3 is correct. Statement 1 is incorrect. Statement 2 is incorrect.
Statement 3 is correct because the Shillong Plateau is a detached block of the Peninsular Indian Shield, primarily composed of Precambrian granites and gneisses that share a common geological origin with the Chota Nagpur Plateau. Statement 1 is incorrect because the Tura Formation is of Eocene age, not Jurassic, and it post-dates the Sylhet Trap volcanics (Early Cretaceous). Statement 2 is incorrect because the Dauki Fault is primarily a transverse reverse fault that accommodates the uplift of the plateau, rather than a strike-slip feature connecting it to the Arakan Yoma fold belt.
Consider the following statements regarding Peninsular Shield Faulting and Lineament Patterns:
1. The Cauvery basin lineaments are associated with the rifting of the eastern continental margin, and these faults became tectonically inactive during the late Cretaceous period.
2. The Satpura horst structure is flanked by the Tapti and Narmada grabens, which developed during the Himalayan orogeny to accommodate the northward drift of the Indian plate.
3. The Dharwar craton is bisected by the Palghat-Cauvery shear zone, which represents the primary suture point between the Indian and Antarctic plates during the formation of Gondwanaland.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because the Cauvery basin lineaments remain tectonically active, showing seismic activity well beyond the Cretaceous period. Statement 2 is incorrect as the Narmada-Tapti grabens formed much earlier during the Precambrian and Paleozoic eras, not as a consequence of the Himalayan orogeny. Statement 3 is incorrect because the Palghat-Cauvery shear zone is an intra-continental suture representing the collision between the Madurai and Dharwar blocks, rather than the boundary between the Indian and Antarctic plates.
Consider the following statements regarding Proterozoic Purana Sedimentary Basins:
1. The Vindhyan Supergroup is characterized by extensive sandstone, shale, and limestone formations that extend from Chittaurgarh in Rajasthan to Sasaram in Bihar.
2. The Cuddapah Supergroup, representing the oldest Purana sedimentary basins, is primarily distributed in the crescent-shaped basin of the Andhra Pradesh region.
3. The Kaladgi Basin, located in northern Karnataka, consists of sedimentary sequences that unconformably overlie the Archean basement rocks of the Dharwar Craton.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
All three statements are correct: the Vindhyan Supergroup forms a massive Proterozoic basin spanning from Rajasthan to Bihar, known for its significant sedimentary deposits. The Cuddapah Supergroup is the oldest Purana sequence, characterized by a distinct crescent-shaped basin in Andhra Pradesh formed after the Archean era. The Kaladgi Basin in northern Karnataka represents a classic Proterozoic sequence that rests unconformably upon the older Dharwar Craton, confirming its geological position within the Purana sedimentary framework.
Consider the following statements regarding Proterozoic Purana Sedimentary Basins:
1. The Kurnool Group, which overlies the Cuddapah Supergroup, is noted for its distinct lack of significant metamorphic alteration compared to the underlying older sequences.
2. The Cuddapah Basin is divided into the Papaghni and Chitravati groups, and these formations are characterized by widespread coal seams of high-grade bituminous quality.
3. The Vindhyan Supergroup contains the Panna diamond-bearing kimberlite pipes, which were formed during the initial depositional phase of the Kaimur sandstone series.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is correct because the Kurnool Group represents a younger, relatively undeformed sedimentary sequence that rests unconformably over the older, more tectonically disturbed Cuddapah Supergroup. Statement 2 is incorrect because the Cuddapah Basin is Proterozoic and predates the evolution of land plants required for coal formation, which occurred much later in the Gondwana period. Statement 3 is incorrect because the Panna diamond-bearing kimberlites are associated with the Majhgawan pipe, which intruded the Vindhyan sediments rather than being formed during the deposition of the Kaimur sandstone series.
Consider the following statements regarding Indo-Gangetic Foredeep Alluvial Architecture:
1. The formation of the Indo-Gangetic foredeep is attributed to the subsidence of the Tethyan oceanic crust, which provided the structural depression necessary for the deposition of the Vindhyan supergroup sediments.
2. The Tarai region is defined by the emergence of fine-grained silt and clay deposits that originated during the Pliocene period, creating a zone of high groundwater recharge and perennial surface flow.
3. The Aravalli-Delhi fold belt acts as a rigid subsurface ridge that divides the Indo-Gangetic foredeep into two distinct basins, with the Indus basin receiving sediment exclusively from the Karakoram range.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because the Indo-Gangetic foredeep formed due to the down-warping of the northern edge of the Indian plate during the Himalayan orogeny, not the Tethyan crust, and it is filled with Quaternary alluvium, not Vindhyan sediments. Statement 2 is incorrect as the Tarai region consists of coarse-grained sediments (bhabar-derived) deposited during the Pleistocene-Holocene, not fine-grained Pliocene deposits. Statement 3 is incorrect because while the Delhi-Hardwar ridge acts as a subsurface divide, the Indus basin receives sediment from a complex network including the Zanskar, Ladakh, and Karakoram ranges, not exclusively the Karakoram.
Consider the following statements regarding Quaternary Fluvial and Aeolian Deposits:
1. Aeolian deposits in the Thar Desert are characterized by the presence of longitudinal and transverse dunes, which were significantly influenced by the aridification trends observed during the Late Pleistocene.
2. The Bhabar zone is a narrow belt of porous gravel and boulder deposits formed by the depositional action of Himalayan rivers, which serves as the primary recharge area for the deep-seated aquifers of the Peninsular plateau.
3. The Indo-Gangetic plains are primarily composed of Quaternary alluvium, which can reach depths exceeding 1,000 meters in certain parts of the Himalayan foredeep.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 3 is correct. Statement 2 is incorrect.
Statement 1 is correct as the Thar Desert's dune systems, including longitudinal and transverse types, evolved significantly due to intensified aridity during the Late Pleistocene. Statement 3 is correct because the Indo-Gangetic foredeep acts as a vast sedimentary basin where Quaternary alluvium has accumulated to depths exceeding 1,000 meters in regions adjacent to the Himalayas. Statement 2 is incorrect because while the Bhabar zone is indeed a porous belt of gravel and boulders, it serves as the recharge area for the Indo-Gangetic plains' aquifers, not the Peninsular plateau, which is a distinct geological entity separated by the central highlands.
Consider the following statements regarding Tertiary Orogeny and Himalayan Tectonic Evolution:
1. The Salt Range in Pakistan is associated with the western syntaxial bend of the Himalayas, where the Precambrian evaporites were thrust over younger Cenozoic strata during the Oligocene.
2. The Main Central Thrust (MCT) defines the contact between the Tethyan Himalayas and the Tibetan Plateau, facilitating the northward subduction of the Indian lithosphere since the Pliocene.
3. The Siwalik group consists of thick sedimentary deposits derived from the erosion of the rising Himalayas, with the Lower Siwaliks dating back to the late Eocene period.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because the Salt Range represents a decollement surface where Precambrian evaporites were thrust over younger strata, but this occurred primarily during the Pliocene-Pleistocene, not the Oligocene. Statement 2 is false as the Main Central Thrust (MCT) separates the Higher Himalayas from the Lesser Himalayas, whereas the Indus-Tsangpo Suture Zone (ITSZ) defines the contact between the Indian plate and the Tibetan Plateau. Statement 3 is incorrect because the Siwalik group is composed of molasse deposits ranging from the Middle Miocene to the Pleistocene, and the Lower Siwaliks (Kamlial formation) date to the Middle Miocene, not the Eocene.
Consider the following statements regarding Cuddapah Basin Sedimentation Cycles:
1. The Cuddapah Basin's sedimentary architecture is defined by a single continuous depositional cycle that lasted from the Palaeoproterozoic to the early Cambrian without any significant hiatus.
2. The Gulcheru Quartzite represents the final phase of the Cuddapah sedimentation cycle and is characterized by deep-water turbidite deposits found in the western part of the basin.
3. The Bairenkonda Quartzite, located within the Nallamalai Group, is composed of high-grade metamorphic gneissic rocks formed during the final tectonic collapse of the basin.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
The Cuddapah Basin is characterized by multiple distinct depositional cycles separated by significant unconformities rather than a single continuous event. The Gulcheru Quartzite is the basal unit of the Cuddapah Supergroup, representing shallow-marine or fluvial deposition at the start of the cycle, not deep-water turbidites at the end. Furthermore, the Bairenkonda Quartzite is a sedimentary formation within the Nallamalai Group, not a metamorphic gneiss, and it was deposited during the Proterozoic rather than being a product of tectonic collapse.
Consider the following statements regarding Deccan Volcanic Province Petrology and Geomorphology:
1. The Deccan Volcanic Province covers an estimated area of 500,000 square kilometers, primarily formed by fissure-type eruptions during the Late Cretaceous period approximately 66 million years ago.
2. Tholeiitic basalt constitutes the predominant rock type of the Deccan Traps, characterized by a fine-grained texture and the presence of plagioclase, pyroxene, and iron-titanium oxides.
3. Geomorphological features such as the Lonar Crater in Maharashtra were formed by volcanic subsidence during the final phase of the Deccan eruptions, creating a saline lake within the basaltic bedrock.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is incorrect.
Statement 1 is correct as the Deccan Traps cover roughly 500,000 sq km, originating from fissure eruptions linked to the Reunion hotspot around 66 million years ago. Statement 2 is correct because tholeiitic basalt is the primary volcanic rock type, composed mainly of plagioclase, pyroxene, and opaque iron-titanium oxides. Statement 3 is incorrect because the Lonar Crater is not a volcanic feature but an impact crater formed by a high-velocity meteorite collision, which subsequently became a saline lake due to the unique basaltic environment.
Consider the following statements regarding Vindhyan Supergroup Stratigraphy and Lithology:
1. The Semri Group represents the oldest sequence of the Vindhyan Supergroup and is characterized by a mix of carbonate rocks and shales.
2. The Bhander Group, the youngest sequence of the Vindhyan Supergroup, consists of alternating layers of red shales, sandstones, and limestones.
3. The Vindhyan basin is a large intracratonic sedimentary basin that covers an area of approximately 100,000 square kilometers across central India.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
The Semri Group forms the basal sequence of the Vindhyan Supergroup, primarily composed of limestones and shales deposited in a marine environment. The Bhander Group represents the youngest stratigraphic unit, characterized by distinct red-colored sandstones and shales indicative of terrestrial depositional conditions. The Vindhyan basin is a classic Proterozoic intracratonic sedimentary basin extending over 100,000 square kilometers across central India, and since all three statements accurately describe these geological features, all are correct.
Consider the following statements regarding Archaean Gneissic Complexes and Cratonic Nuclei:
1. The Bastar Craton is defined by the presence of the Sakoli Group, which represents the oldest volcanic sequence in the central Indian shield and is unconformably overlain by the Sausar Group.
2. The Aravalli Craton experienced its final phase of cratonization during the Neoproterozoic era, coinciding with the deposition of the Vindhyan Supergroup in the adjacent sedimentary basin.
3. The Singhbhum Craton is characterized by the presence of the Kolar Schist Belt, which serves as the primary gold-bearing geological formation within the easternmost segment of the Indian peninsula.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because the Sakoli Group is associated with the Nagpur-Bhandara region (Central Indian Tectonic Zone) rather than the Bastar Craton. Statement 2 is incorrect as the Aravalli Craton underwent its primary cratonization during the Archean-Paleoproterozoic boundary (c. 2.5 Ga), long before the Neoproterozoic deposition of the Vindhyan Supergroup. Statement 3 is incorrect because the Kolar Schist Belt is located within the Dharwar Craton in Southern India, not the Singhbhum Craton, which is instead famous for the Iron Ore Group and the Singhbhum Granite.
Consider the following statements regarding Quaternary Fluvial and Aeolian Deposits:
1. The Younger Alluvium, or Khadar, is characterized by a high rate of annual deposition and is primarily found in the active floodplains of the Indus, Ganga, and Brahmaputra river systems.
2. The Thar Desert's aeolian landscape is dominated by the Luni River basin, which acts as the primary source of sediment for the active sand dunes located in the westernmost parts of Jaisalmer.
3. The Older Alluvium, known as Bhangar, consists of semi-consolidated calcareous clay and kankar nodules, dating back to the Middle to Late Pleistocene epoch.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 3 is correct. Statement 2 is incorrect.
Statement 1 is correct as Khadar consists of fresh, nutrient-rich silt deposited annually by the Himalayan river systems, maintaining high fertility. Statement 3 is correct because Bhangar represents the older, elevated alluvial terraces formed during the Middle to Late Pleistocene, characterized by the presence of calcium carbonate concretions known as 'kankar'. Statement 2 is incorrect because the Thar Desert's aeolian sand dunes are primarily derived from the weathering of underlying rocks and long-distance transport by winds from the Rann of Kutch, rather than being sourced from the ephemeral Luni River, which is a drainage system rather than a sediment source for active dunes.
Consider the following statements regarding Tertiary Orogeny and Himalayan Tectonic Evolution:
1. The Indus-Tsangpo Suture Zone (ITSZ) represents the collision boundary between the Indian Plate and the Eurasian Plate, characterized by the presence of ophiolitic suites.
2. The Himalayan orogeny initiated approximately 50 million years ago during the Eocene period, following the closure of the Tethys Sea.
3. The Main Boundary Thrust (MBT) separates the Lesser Himalayas from the Sub-Himalayan Siwalik range, marking a significant tectonic discontinuity formed during the Miocene epoch.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
All three statements are correct: the ITSZ marks the tectonic suture where the Indian and Eurasian plates collided, trapping oceanic crustal fragments known as ophiolites. The Himalayan orogeny began roughly 50 million years ago in the Eocene following the closure of the Tethys Sea, while the MBT serves as the distinct tectonic boundary between the Lesser Himalayas and the Siwaliks, established during the Miocene epoch as the mountain building process progressed southward.
Consider the following statements regarding Siwalik Group Molasse Deposits:
1. The Lower Siwalik deposits are characterized by coarse-grained boulder conglomerates, which indicate a high-energy glacial environment during the initial phase of Himalayan orogeny.
2. The Pinjor Formation of the Upper Siwalik is distinguished by its fine-grained clay deposits, which signify a deep-marine depositional setting far from the mountain front during the Pliocene.
3. The Siwalik Group is renowned for its rich vertebrate fossil record, including the discovery of various hominoid remains such as Sivapithecus, which were extensively studied in the 19th century.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 3 is correct. Statement 1 is incorrect. Statement 2 is incorrect.
Statement 3 is correct as the Siwalik Group is globally significant for its rich vertebrate fossils, including the Miocene hominoid Sivapithecus, extensively documented since the 19th century. Statement 1 is incorrect because the Lower Siwalik (Chinji/Nagri formations) consists primarily of fine-grained sandstones and shales, while coarse boulder conglomerates characterize the Upper Siwalik. Statement 2 is incorrect because the entire Siwalik sequence represents a terrestrial, fluviatile (river-dominated) molasse deposit formed in a foreland basin, not a deep-marine environment.
Consider the following statements regarding Tertiary Marine Transgressions in Western India:
1. The Khirthar series, dating back to the Middle Eocene, records the presence of marine fauna such as Discocyclina and Nummulites in the stratigraphic successions of Western India.
2. During the early Tertiary period, the Tethys Sea extended into the present-day desert regions of Rajasthan, leading to the formation of the Fuller's Earth deposits in the Palana area.
3. The transgression during the Oligocene epoch resulted in the deposition of the Kharaghoda formation, which is geologically associated with the development of evaporite sequences in the Rann of Kutch.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
Statement 1 is correct as the Middle Eocene Khirthar series is characterized by rich foraminiferal assemblages like Discocyclina and Nummulites, indicating a widespread marine transgression. Statement 2 is correct because the Eocene sea extended into the Bikaner-Jaisalmer basins of Rajasthan, depositing marine sediments including Fuller's Earth (bentonitic clay) near Palana. Statement 3 is correct as the Oligocene marine incursions in the Kutch region facilitated the deposition of evaporites and saline sequences, such as those found in the Kharaghoda formation, due to restricted basin conditions.
Consider the following statements regarding Ophiolite Suites and Suture Zones of the Indus-Tsangpo:
1. The Spongtang Ophiolite complex in the Zanskar range serves as a significant geological marker for the obduction of oceanic lithosphere onto the northern margin of the Indian continental plate.
2. Ophiolite suites within the Ladakh region are characterized by a sequence of ultramafic rocks, including peridotite and dunite, which represent remnants of the Tethyan oceanic crust.
3. The Shyok Suture Zone, located north of the Indus-Tsangpo Suture Zone, is associated with the closure of the back-arc basin that existed between the Ladakh Batholith and the Karakoram block.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
The Spongtang Ophiolite complex represents a classic obduction event where Tethyan oceanic lithosphere was thrust onto the Indian plate margin during the initial stages of the India-Asia collision. The Ladakh ophiolites, specifically those in the Indus Suture Zone, are composed of mantle-derived peridotites and dunites that confirm the existence of the Neo-Tethyan oceanic crust prior to its subduction. The Shyok Suture Zone marks the tectonic boundary formed by the closure of the back-arc basin located between the Ladakh magmatic arc and the Karakoram block, distinct from the main Indus-Tsangpo Suture Zone.
Consider the following statements regarding Dharwar Craton Metallogenic Provinces:
1. The Gadag gold field is associated with the Dharwar Supergroup in the Eastern Dharwar Craton, where mineralization is linked to the emplacement of the 2.5 billion-year-old Closepet Granite.
2. The Peninsular Gneiss complex serves as the basement for the entire Dharwar Craton and exhibits uniform isotopic signatures across both the eastern and western tectonic blocks.
3. The Sandur Schist Belt is situated within the Western Dharwar Craton and contains extensive banded iron formations that were deposited during the Paleoproterozoic era.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because the Gadag gold field is located in the Western Dharwar Craton, not the Eastern. Statement 2 is incorrect because the Peninsular Gneiss complex is not a single uniform basement; it exhibits distinct isotopic and geochemical differences between the older Western Dharwar Craton (3.4-3.2 Ga) and the younger Eastern Dharwar Craton (2.7-2.5 Ga). Statement 3 is incorrect because the Sandur Schist Belt is located in the Eastern Dharwar Craton, and its banded iron formations belong to the Neoarchean era (c. 2.7 Ga) rather than the Paleoproterozoic.
Consider the following statements regarding Geological Evolution of the Shillong Plateau:
1. The plateau's basement complex consists of sedimentary sequences from the Gondwana system, which were metamorphosed during the late Paleozoic era when the Indian plate drifted northward from the supercontinent Pangea.
2. The Cherrapunji region is characterized by the presence of extensive limestone deposits formed during the Oligocene, which were subjected to intense folding forces during the final phase of the Himalayan orogeny.
3. The southern margin of the Shillong Plateau exhibits a steep escarpment that overlooks the Surma Valley, reflecting significant vertical displacement along the Dauki Fault system.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 3 is correct. Statement 1 is incorrect. Statement 2 is incorrect.
Statement 3 is correct because the Shillong Plateau is a detached block of the Peninsular shield separated by the Malda Gap, and its southern margin is defined by the active Dauki Fault, causing a sharp vertical escarpment. Statement 1 is incorrect because the basement complex consists of ancient Archean-Proterozoic rocks (Shillong Group), not Gondwana sedimentary sequences. Statement 2 is incorrect because the extensive limestone deposits of the Cherrapunji region belong to the Eocene (Sylhet Limestone formation), not the Oligocene, and were deposited during a marine transgression before the main Himalayan orogenic folding.
Consider the following statements regarding Gondwana Coal-bearing Formations and Rift Valleys:
1. The Jharia coalfield is associated with the Damodar valley graben, where the coal seams are interbedded with thick layers of limestone formed during the Jurassic period.
2. The Satpura Gondwana basin is characterized by the Mahadeva series, which consists of coarse-grained conglomerates that were deposited in a high-energy fluvial environment during the Devonian period.
3. The Panchet series, forming the uppermost division of the Lower Gondwana, is composed of greenish-grey sandstones and was deposited in an arid environment following the retreat of the Tethys Sea.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because Gondwana coal seams are interbedded with shales and sandstones, not limestone, and the coal formation occurred primarily during the Permian, not the Jurassic. Statement 2 is incorrect as the Mahadeva series belongs to the Upper Gondwana system (Triassic-Jurassic), not the Devonian period, which predates the Gondwana sequence. Statement 3 is incorrect because the Panchet series is the uppermost division of the Lower Gondwana, but it was deposited in a fluviatile environment during the Triassic, not due to the retreat of the Tethys Sea, which is unrelated to the depositional setting of these inland rift basins.
Consider the following statements regarding Indo-Gangetic Foredeep Alluvial Architecture:
1. Seismic refraction studies indicate that the maximum thickness of the alluvial sediments in the Ganga basin exceeds 6,000 meters near the Himalayan foothills, thinning progressively toward the Peninsular shield.
2. The Indo-Gangetic foredeep originated as a peripheral foreland basin during the Miocene epoch, resulting from the crustal flexure of the Indian plate beneath the advancing Himalayan orogenic wedge.
3. The Brahmaputra valley represents a distinct tectonic trough formed by the strike-slip movement of the Dauki Fault, which serves as the primary sediment source for the entire eastern foredeep architecture.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is incorrect.
Statement 1 is correct as geophysical surveys confirm the Ganga basin is a deep asymmetrical foredeep with sediment thickness exceeding 6,000 meters near the Himalayan front, tapering towards the rigid Peninsular shield. Statement 2 is correct because the basin formed as a peripheral foreland trough during the Miocene due to lithospheric flexure caused by the loading of the advancing Himalayan orogenic wedge. Statement 3 is incorrect because, while the Brahmaputra valley is a tectonic trough, it is primarily a structural depression associated with the Himalayan foredeep and the Shillong Plateau's uplift, and its sediment supply is derived from the eastern Himalayas and the Mishmi Hills rather than being solely defined by the Dauki Fault.
Consider the following statements regarding Geological Evolution of the Shillong Plateau:
1. The Shillong Plateau underwent extensive volcanic activity during the Cretaceous period, which resulted in the formation of the Rajmahal Traps and the subsequent uplift of the Khasi Hills.
2. The Malda Gap originated as a result of the collision between the Indian Plate and the Eurasian Plate during the Eocene epoch, creating a deep oceanic trench that was later filled by alluvial deposits.
3. The Shillong Plateau is a detached segment of the Peninsular Block, separated from the main landmass by the Malda Gap, which was formed due to down-faulting during the late Tertiary period.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 3 is correct. Statement 1 is incorrect. Statement 2 is incorrect.
Statement 3 is correct because the Shillong Plateau is a detached block of the Peninsular plateau, separated by the Malda Gap formed through down-faulting during the late Tertiary period. Statement 1 is incorrect because while the Rajmahal Traps formed during the Cretaceous, they are distinct from the Shillong Plateau's crystalline basement. Statement 2 is incorrect because the Malda Gap was not formed by the Himalayan collision, but rather by tectonic subsidence or down-faulting that created a trough subsequently filled by Ganga-Brahmaputra alluvium.
Consider the following statements regarding Tertiary Orogeny and Himalayan Tectonic Evolution:
1. The Great Himalayan range is primarily composed of high-grade metamorphic rocks such as schists and gneisses, which were uplifted during the second phase of the Himalayan orogeny.
2. The Trans-Himalayan region includes the Ladakh and Zanskar ranges, which originated from the volcanic arc activity occurring along the southern margin of the Indian plate during the Cretaceous.
3. The Lesser Himalayas are characterized by the presence of the Krol Belt, which contains fossiliferous limestone deposits formed during the early Jurassic marine transgression.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is correct as the Great Himalayas consist of core crystalline rocks like schists and gneisses uplifted during the Miocene epoch (second phase). Statement 2 is incorrect because the Trans-Himalayas (Ladakh/Zanskar) originated from the volcanic arc activity along the southern margin of the Eurasian plate, not the Indian plate. Statement 3 is incorrect because the Krol Belt of the Lesser Himalayas is primarily associated with the Proterozoic to early Cambrian periods, not the Jurassic marine transgression.
Consider the following statements regarding Craton-Mobile Belt Interaction in Central India:
1. The Bastar Craton is characterized by the presence of the Bailadila Iron Ore Series, which formed during the Mesoproterozoic period as a result of active subduction along the southern margin of the Central Indian Tectonic Zone.
2. The Tan Shear Zone serves as a significant crustal-scale boundary within the Central Indian Tectonic Zone, facilitating the tectonic juxtaposition of the Mahakoshal Group against the Bundelkhand Craton.
3. The Satpura Orogeny is defined by the widespread emplacement of the Deccan Traps, which effectively masked the underlying cratonic boundaries of the Central Indian Tectonic Zone during the Late Cretaceous period.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 2 is correct. Statement 1 is incorrect. Statement 3 is incorrect.
Statement 2 is correct as the Tan Shear Zone acts as a major tectonic boundary separating the Mahakoshal supracrustal belt from the Bundelkhand Craton. Statement 1 is incorrect because the Bailadila Iron Ore Series belongs to the Neoarchean Iron Ore Group, not the Mesoproterozoic, and is not associated with subduction along the Central Indian Tectonic Zone. Statement 3 is incorrect because the Satpura Orogeny is a Proterozoic tectonic event, whereas the Deccan Traps are flood basalts formed during the Late Cretaceous, which post-date the orogeny by hundreds of millions of years.
Consider the following statements regarding Proterozoic Purana Sedimentary Basins:
1. The Bhima Group, situated along the Bhima River valley, contains limestone deposits that are commercially exploited for the cement industry in the Deccan plateau.
2. The Chhattisgarh Basin is recognized as the largest Purana sedimentary basin in the Peninsular region, occupying a significant portion of the Mahanadi valley.
3. The Delhi Supergroup, often associated with the Proterozoic era, represents the final phase of the Purana basins and is composed primarily of extensive marine evaporite deposits.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is incorrect.
Statement 1 is correct as the Bhima Group is a well-known Proterozoic basin rich in limestone, which serves as a vital raw material for the cement industry in the Deccan region. Statement 2 is correct because the Chhattisgarh Basin covers approximately 35,000 sq. km, making it the largest among the Purana basins of Peninsular India. Statement 3 is incorrect because the Delhi Supergroup consists primarily of metamorphosed sedimentary rocks like quartzites, phyllites, and schists, rather than marine evaporites, and it represents a complex tectonic fold belt rather than a simple sedimentary basin.
Consider the following statements regarding Tectonic Significance of the Main Boundary Thrust (MBT):
1. The Main Boundary Thrust is associated with the formation of the Trans-Himalayan batholiths, and its structural orientation is primarily controlled by the northward propagation of the Main Frontal Thrust (MFT) since the early Pleistocene.
2. Tectonic analysis shows that the MBT functions as a strike-slip fault system that accommodates the eastward extrusion of the Tibetan Plateau, effectively decoupling the Lesser Himalayas from the crystalline core of the Zanskar range.
3. Lithological studies confirm that the Main Boundary Thrust consists of Precambrian metamorphic rocks thrust over the Gondwana coal-bearing strata, a process that concluded during the Pliocene epoch approximately 2 million years ago.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
All three statements are incorrect because the MBT is a major thrust fault separating the Lesser Himalayas from the Sub-Himalayas (Siwaliks), not the Trans-Himalayas or Zanskar range. Statement 1 is false as the MBT predates the MFT and is not associated with Trans-Himalayan batholiths. Statement 2 is incorrect because the MBT is a reverse/thrust fault, not a strike-slip system, and it does not facilitate Tibetan extrusion. Statement 3 is inaccurate because the MBT involves the thrusting of older Himalayan rocks over the younger Siwalik (Tertiary) sediments, not Precambrian rocks over Gondwana strata, and its activity has continued well into the Quaternary period.
Consider the following statements regarding Tertiary Marine Transgressions in Western India:
1. The Miocene-aged Dwarka beds are associated with the regressive phase of the Tethys Sea, which deposited thick sequences of coal-bearing strata in the Cambay graben during the Burdigalian stage.
2. The Tertiary marine sequences in the Surat-Broach region are marked by the presence of the Tarkeshwar formation, which serves as a key marker for the Early Eocene sea-level rise.
3. The Umia series of the Kutch basin consists of marine limestones formed during the Paleocene transgression, providing the stratigraphic foundation for the subsequent deposition of the Bhuj sandstone.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 2 is correct. Statement 1 is incorrect. Statement 3 is incorrect.
Statement 2 is correct as the Tarkeshwar Formation represents the Early Eocene transgression in the Cambay Basin, characterized by lignite-bearing shales and marine fossils. Statement 1 is incorrect because the Dwarka beds are marine deposits from the Miocene transgression, not a regressive phase, and the Cambay coal-bearing strata (e.g., Cambay Shale) are primarily Eocene in age. Statement 3 is incorrect because the Umia series belongs to the Upper Jurassic-Lower Cretaceous period, predating the Tertiary marine transgressions by millions of years, and the Bhuj sandstone actually underlies the Tertiary sequences.
Consider the following statements regarding Kutch and Saurashtra Mesozoic Sedimentary Sequences:
1. The Deccan Traps in the Saurashtra peninsula are underlain by the Dhrangadhra Formation, which contains evidence of fluvial and deltaic sedimentation during the Lower Cretaceous.
2. The Patcham Formation constitutes the basal unit of the Kutch Mesozoic sequence and is defined by its widespread volcanic ash beds that originated from the initial rifting of the Gondwana supercontinent.
3. The Mesozoic strata of the Kutch mainland exhibit a distinct structural trend influenced by the E-W trending Katrol Hill Fault, which separates the northern and southern sedimentary basins.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 3 is correct. Statement 2 is incorrect.
Statement 1 is correct as the Dhrangadhra Formation, dating to the Lower Cretaceous, represents fluvio-deltaic deposits unconformably overlain by Deccan Trap basalts. Statement 3 is correct because the Katrol Hill Fault is a major tectonic feature in the Kutch mainland that controls the depositional patterns and structural configuration of the Mesozoic strata. Statement 2 is incorrect because the Patcham Formation, the basal unit of the Kutch Mesozoic sequence, consists primarily of marine limestones and shales deposited during the Middle Jurassic, not volcanic ash beds related to Gondwana rifting.
Consider the following statements regarding Quaternary Fluvial and Aeolian Deposits:
1. The Karewa deposits of the Pir Panjal range are composed of thick marine limestone layers that were uplifted during the early Pliocene, marking the transition from the Tethys Sea to the current fluvial regime.
2. The loessic deposits found in the Kashmir Valley are associated with the Karewa formations, representing a unique Quaternary fluvial-lacustrine sequence.
3. The Rann of Kachchh contains Quaternary marine and fluvial sediments that reflect the complex interaction between sea-level fluctuations and the tectonic uplift of the region.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 2 is correct. Statement 3 is correct. Statement 1 is incorrect.
Statement 1 is incorrect because Karewa deposits are lacustrine (lake-derived) deposits consisting of silt, clay, sand, and gravel, not marine limestone. Statement 2 is correct as the Kashmir Valley features thick Quaternary fluvial-lacustrine sequences known as Karewas, which are often overlain by wind-blown loessic deposits. Statement 3 is correct because the Rann of Kachchh is a geologically active region where Quaternary sediments record the interplay between episodic marine transgressions and tectonic movements related to the ongoing collision of the Indian Plate.
Consider the following statements regarding Cuddapah Basin Sedimentation Cycles:
1. The Cheyair Group is noted for the Vempalle Formation, which contains significant deposits of bedded barite and dolomite formed during the primary marine transgression.
2. The Nallamalai Group constitutes the basal sequence of the Cuddapah Supergroup and is primarily composed of volcanic basalt flows associated with the initial rifting phase of the basin.
3. The Kurnool Group, which rests unconformably over the Cuddapah Supergroup, is defined by extensive glacial tillites deposited during the late Neoproterozoic period.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
All three statements are incorrect because they misidentify the stratigraphic sequence of the Cuddapah Basin. Statement 1 is false as the Vempalle Formation belongs to the Papaghni Group, not the Cheyair Group. Statement 2 is incorrect because the Nallamalai Group represents the upper sequence of the Cuddapah Supergroup, whereas the basal sequence is the Papaghni Group characterized by volcanic activity. Statement 3 is false because the Kurnool Group consists of sedimentary rocks like shales and limestones, not glacial tillites, and it represents a distinct sedimentary cycle separated by a major unconformity.
Consider the following statements regarding Peninsular Shield Faulting and Lineament Patterns:
1. The Godavari rift valley exhibits a northwest-southeast trending fault system that originated during the Gondwana sedimentation period.
2. The Narmada-Son lineament acts as a major crustal fracture zone, separating the Bundelkhand craton to the north from the Deccan plateau to the south.
3. The Western Ghats escarpment is interpreted by geologists as a continental margin feature formed by the rifting of the Indian plate from Madagascar approximately 88 million years ago.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
Statement 1 is correct as the Godavari rift is a classic NW-SE trending graben that facilitated Gondwana sedimentation. Statement 2 is correct because the Narmada-Son lineament is a deep-seated crustal fracture zone acting as a major tectonic boundary between the northern Bundelkhand/Vindhyan blocks and the southern Deccan shield. Statement 3 is correct as the Western Ghats escarpment is a rift-flank uplift resulting from the breakup of the Indo-Madagascar block approximately 88-90 million years ago, which created the passive continental margin of western India.
Consider the following statements regarding Tectonic Significance of the Main Boundary Thrust (MBT):
1. The MBT is a low-angle normal fault that allows for the extension of the Himalayan orogen, providing the structural framework for the development of the intermontane Dun valleys in the Dehradun region.
2. The Main Boundary Thrust (MBT) acts as a major tectonic discontinuity that separates the Lesser Himalayan sequences from the Siwalik Group of the Outer Himalayas, typically showing a northward dip ranging between 30 to 45 degrees.
3. Seismic data from the 1905 Kangra earthquake suggests that the rupture originated along the Main Boundary Thrust, which serves as the boundary between the Indian Shield and the Indo-Gangetic foredeep basin.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 2 is correct. Statement 1 is incorrect. Statement 3 is incorrect.
Statement 2 is correct because the MBT is a major crustal-scale thrust fault that marks the boundary between the Lesser Himalayas and the Siwalik Group, characterized by a northward dip of 30-45 degrees. Statement 1 is incorrect because the MBT is a reverse (thrust) fault, not a normal fault, and the Dun valleys are primarily formed by synclinal structures within the Siwaliks rather than extensional tectonics. Statement 3 is incorrect because the 1905 Kangra earthquake is associated with the MBT, but the boundary between the Indian Shield and the Indo-Gangetic foredeep is defined by the Main Frontal Thrust (MFT) or the Himalayan Frontal Fault (HFF), not the MBT.
Consider the following statements regarding Tectonic Significance of the Main Boundary Thrust (MBT):
1. The Main Boundary Thrust is characterized by the juxtaposition of the Tethyan Himalayan sedimentary rocks against the crystalline basement of the Higher Himalayas, marking the primary suture zone formed during the Eocene epoch.
2. Geological mapping indicates that the Main Boundary Thrust terminates near the Indus-Tsangpo Suture Zone, where it facilitates the subduction of the Indian Plate beneath the Eurasian Plate at a rate of 5 centimeters per year.
3. The MBT represents the southern limit of the Main Central Thrust (MCT) system, and it is responsible for the uplift of the Pir Panjal range through the activation of the Panjal Volcanics during the late Miocene period.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because the MBT separates the Lesser Himalayas from the Siwaliks, not the Tethyan Himalayas from the Higher Himalayas (which is the role of the Main Central Thrust). Statement 2 is incorrect as the MBT does not terminate at the Indus-Tsangpo Suture Zone; the latter marks the collision boundary between the Indian and Eurasian plates, while the MBT is a much further south, younger crustal fault. Statement 3 is incorrect because the MBT is not the southern limit of the MCT, and the uplift of the Pir Panjal range is primarily associated with the Main Boundary Thrust's movement, but the Panjal Volcanics are Permian-aged rocks, not late Miocene features.
Consider the following statements regarding Indo-Gangetic Foredeep Alluvial Architecture:
1. The stratigraphic sequence of the foredeep is primarily composed of the Siwalik Group sediments, which were subsequently overlain by Quaternary alluvial deposits classified into older Bhangar and younger Khadar formations.
2. The Bhabar zone, characterized by highly permeable gravel and boulder deposits, represents the northernmost belt of the Indo-Gangetic plains where streams frequently disappear into the subsurface.
3. Geophysical surveys conducted in 1974 identified the Bundelkhand Craton as the basement rock underlying the entire extent of the Punjab-Haryana plains, facilitating uniform sediment compaction across the region.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is incorrect.
Statement 1 is correct as the Indo-Gangetic foredeep formed via the collision of the Indian and Eurasian plates, resulting in the deposition of Siwalik molasse followed by Quaternary alluvium. Statement 2 is correct because the Bhabar zone consists of coarse, porous debris deposited at the Himalayan foothills, causing ephemeral streams to disappear underground. Statement 3 is incorrect because the basement of the Indo-Gangetic plains is structurally complex and uneven, characterized by subsurface ridges like the Delhi-Hardwar ridge, rather than a uniform extension of the Bundelkhand Craton.
Consider the following statements regarding Kutch and Saurashtra Mesozoic Sedimentary Sequences:
1. The Wadhwan Formation in the Saurashtra region consists of sandstone and conglomerate beds that unconformably overlie the Precambrian basement rocks.
2. Marine transgressions during the Jurassic period led to the deposition of the Jhurio Formation, which is characterized by fossiliferous limestone and shale sequences in the Kutch basin.
3. The Umia Formation, located in the Kutch region, contains significant plant fossil assemblages and coal seams that indicate a transition from marine to estuarine depositional environments.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
The Wadhwan Formation represents the Cretaceous sedimentary sequence in Saurashtra, resting unconformably on Precambrian basement rocks. The Jhurio Formation in Kutch marks the earliest marine transgression of the Middle Jurassic period, evidenced by its rich limestone and shale deposits. The Umia Formation signifies the final phase of the Mesozoic sequence in Kutch, where the transition from marine to estuarine conditions is confirmed by the presence of coal seams and diverse plant fossil assemblages.
Consider the following statements regarding Deccan Traps Flood Basalt Volcanism:
1. The basaltic flows of the Deccan Traps are characterized by a fissure-type eruption, which resulted in the formation of extensive horizontal lava sheets known as plateau basalts.
2. The volcanic activity responsible for the formation of the Deccan Traps occurred during the Late Cretaceous period, approximately 66 million years ago.
3. The Deccan Traps cover an area of approximately 500,000 square kilometers, primarily distributed across the states of Maharashtra, Gujarat, and Madhya Pradesh.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
The Deccan Traps formed via fissure-type eruptions during the Late Cretaceous (approx. 66 million years ago) as the Indian plate passed over the Reunion hotspot, creating vast horizontal lava sheets. These basaltic flows cover roughly 500,000 square kilometers, predominantly across Maharashtra, Gujarat, and Madhya Pradesh, forming a classic example of flood basalt volcanism. Since all three statements accurately describe the geological mechanism, timing, and geographical extent of this formation, all are correct.
Consider the following statements regarding Dharwar Craton Metallogenic Provinces:
1. The Hutti-Maski greenstone belt is a significant gold-bearing province in the Eastern Dharwar Craton, characterized by quartz-carbonate vein-type mineralization.
2. The Shimoga and Chitradurga belts in the Western Dharwar Craton are primarily composed of greenschist-facies sedimentary and volcanic rocks, forming the Dharwar Supergroup.
3. The Closepet Granite is a massive batholith that intrudes the Dharwar Craton, marking the transition zone between the high-grade granulite terrain of the south and the low-grade greenstone belts of the north.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
Statement 1 is correct as the Hutti-Maski belt in the Eastern Dharwar Craton is a premier gold province where mineralization is hosted in shear-controlled quartz-carbonate veins. Statement 2 is correct because the Shimoga and Chitradurga belts represent the supracrustal rocks of the Dharwar Supergroup, which underwent low-grade greenschist-facies metamorphism. Statement 3 is correct as the Neoarchean Closepet Granite batholith serves as a major crustal suture, physically and geologically separating the high-grade granulite facies rocks of the Southern Dharwar Craton from the low-grade greenstone-granite terrain of the north.
Consider the following statements regarding Vindhyan Supergroup Stratigraphy and Lithology:
1. The Sirbu Shale formation, located within the Semri Group, contains significant deposits of phosphorite that are extracted for agricultural fertilizer production.
2. The Vindhyan Supergroup rests unconformably over the Cuddapah Supergroup, indicating a continuous depositional history from the Proterozoic to the early Cambrian period.
3. The Rohtas Limestone, a prominent formation within the Bhander Group, serves as a primary source of raw material for the cement industry in the Son Valley.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because phosphorite deposits are primarily found in the Semri Group's Gangau/Chitrakoot formations, not the Sirbu Shale, which belongs to the Bhander Group. Statement 2 is incorrect as the Vindhyan Supergroup rests unconformably over the Archaean basement (Bundelkhand Granite/Bijawar Group), not the Cuddapah Supergroup, and represents a distinct depositional cycle. Statement 3 is incorrect because the Rohtas Limestone belongs to the Semri Group (the oldest sequence), not the Bhander Group, although it is indeed a vital resource for the cement industry.
Consider the following statements regarding Tertiary Marine Transgressions in Western India:
1. The Gaj series of the Miocene period represents a significant marine transgression that deposited fossiliferous limestones and shales along the coastal tracts of Kathiawar.
2. The Eocene epoch in Western India is characterized by the deposition of the Nummulitic limestone, which indicates widespread marine transgression across the Kutch and Cambay basins.
3. The Deccan Trap volcanism of the Late Cretaceous was followed by the deposition of the Lameta beds, which represent the primary marine transgression phase that established the current coastline of the Konkan region.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is incorrect.
Statement 1 is correct as the Gaj series (Miocene) consists of fossiliferous marine deposits found in Kathiawar, marking a distinct marine incursion. Statement 2 is correct because the Eocene epoch witnessed the deposition of Nummulitic limestone, a hallmark of extensive marine transgression in the Kutch and Cambay basins. Statement 3 is incorrect because the Lameta beds are primarily terrestrial or lacustrine deposits formed in the Late Cretaceous, and the current Konkan coastline was shaped by much later tectonic subsidence and sea-level changes, not by the Lameta deposition.
Consider the following statements regarding Peninsular Shield Faulting and Lineament Patterns:
1. The Mahanadi graben system is characterized by a series of parallel faults that facilitated the preservation of coal-bearing Permian strata.
2. The Cambay rift basin consists of a series of north-south trending grabens that were initiated during the Precambrian era and later reactivated by the Deccan volcanic activity.
3. The Great Boundary Fault of Rajasthan extends for over 400 kilometers, marking the tectonic contact between the Vindhyan supergroup and the Aravalli mountain range.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 3 is correct. Statement 2 is incorrect.
Statement 1 is correct as the Mahanadi graben is a classic rift valley where subsidence preserved Gondwana coal-bearing Permian sediments from erosion. Statement 3 is correct because the Great Boundary Fault is a major tectonic feature stretching over 400 km, defining the contact between the Proterozoic Aravalli rocks and the younger Vindhyan sediments. Statement 2 is incorrect because the Cambay rift basin is a Mesozoic-Cenozoic feature associated with the breakup of Gondwanaland, not the Precambrian era, and its formation is linked to the northward drift of the Indian plate rather than Precambrian initiation.
Consider the following statements regarding Gondwana Coal-bearing Formations and Rift Valleys:
1. Gondwana coal formations in India are primarily preserved in down-faulted troughs, such as the Damodar, Mahanadi, and Son river valleys, which were formed during the Permo-Carboniferous period.
2. The Wardha Valley coalfield is situated within the Godavari rift system, and its stratigraphic sequence is defined by the presence of volcanic basalt flows that directly underlie the coal seams.
3. The Barakar formation serves as the primary coal-bearing horizon in the Raniganj coalfield, and its depositional history is marked by extensive marine transgressions during the Upper Carboniferous.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is correct as Gondwana coal deposits were preserved in down-faulted rift troughs formed by tectonic subsidence during the Permo-Carboniferous period. Statement 2 is incorrect because the Wardha Valley coalfield is part of the Godavari graben, but the coal seams are typically overlain, not underlain, by the Deccan Trap volcanic basalt flows. Statement 3 is incorrect because the Barakar formation is indeed a primary coal-bearing horizon, but Gondwana coal deposition in India occurred primarily in freshwater (fluvial/lacustrine) environments rather than through marine transgressions.
Consider the following statements regarding Ophiolite Suites and Suture Zones of the Indus-Tsangpo:
1. The Indus-Tsangpo Suture Zone extends westward into the Hindu Kush mountains, where it links with the Chaman fault system to facilitate the ongoing crustal shortening of the Tibetan Plateau.
2. The Dras Volcanic series consists of basaltic and andesitic rocks that formed during the late Cretaceous, marking the final stage of subduction before the uplift of the Greater Himalayas.
3. Radiometric dating of the Shergol ophiolites suggests an emplacement age of 75 million years, corresponding to the initial contact between the Indian plate and the Kohistan-Ladakh island arc.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is incorrect. Statement 2 is incorrect. Statement 3 is incorrect.
Statement 1 is incorrect because the Indus-Tsangpo Suture Zone (ITSZ) terminates at the Nanga Parbat syntaxis and does not link with the Chaman fault system, which is a separate transform boundary. Statement 2 is incorrect as the Dras Volcanics represent an island arc sequence formed during the mid-Cretaceous (approx. 100-85 Ma) rather than the final stage of subduction. Statement 3 is incorrect because the Shergol ophiolites are associated with the closing of the Neo-Tethys and the obduction of oceanic crust onto the Indian margin, with emplacement ages typically cited around 60-50 Ma, coinciding with the India-Asia collision rather than the earlier Kohistan-Ladakh arc contact.
Consider the following statements regarding Siwalik Group Molasse Deposits:
1. The Siwalik sediments exhibit a characteristic coarsening-upward sequence, reflecting the increasing tectonic activity and erosion rates in the Himalayan hinterland over geological time.
2. The Siwalik Group is primarily composed of marine limestone and dolomite sequences, which were deposited in the Tethys Sea before the final uplift of the Himalayan range during the Eocene period.
3. The Main Boundary Thrust (MBT) separates the Siwalik Group from the older Lesser Himalayan formations to the north, marking a significant structural discontinuity.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 3 is correct. Statement 2 is incorrect.
Statement 1 is correct as the Siwalik Group represents a classic molasse sequence, where increasing grain size from fine-grained mudstones to coarse conglomerates records the progressive uplift and erosion of the Himalayas since the Miocene. Statement 3 is correct because the Main Boundary Thrust (MBT) serves as the primary tectonic contact separating the younger Siwalik sedimentary rocks from the older Proterozoic and Paleozoic rocks of the Lesser Himalayas. Statement 2 is incorrect because the Siwalik Group consists of terrestrial (fluvial) sediments, such as sandstone and conglomerate, rather than marine limestone, which characterizes the older Tethyan sedimentary sequences.
Consider the following statements regarding Deccan Traps Flood Basalt Volcanism:
1. The formation of the Western Ghats escarpment is attributed to the initial uplift of the Deccan Traps during the Miocene, which created the drainage divide for the Godavari and Krishna river systems.
2. The K-Pg boundary, marking the mass extinction event, is chronologically linked to the peak phase of the Deccan Traps volcanism in the Western Indian region.
3. The thickness of the Deccan Traps reaches up to 2,000 meters in the Western Ghats region, gradually thinning towards the eastern margins of the plateau.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 2 is correct. Statement 3 is correct. Statement 1 is incorrect.
Statement 1 is incorrect because the Western Ghats escarpment formation and the uplift of the Deccan plateau are primarily associated with the rifting of the Indian plate from the Seychelles around 65-60 million years ago (Paleocene), not the Miocene. Statement 2 is correct as the peak phase of Deccan volcanism (approx. 66 million years ago) coincides with the Cretaceous-Paleogene (K-Pg) mass extinction event, which significantly altered global climate. Statement 3 is correct because the Deccan Traps exhibit a 'stepped' topography with a maximum thickness of over 2,000 meters in the Western Ghats, reflecting the proximity to the volcanic source, which tapers significantly as the lava flows spread eastward.
Consider the following statements regarding Gondwana Coal-bearing Formations and Rift Valleys:
1. The Satpura Gondwana basin contains the Pachmarhi formation, which is distinguished by its thick red sandstone layers deposited during the Triassic period.
2. The Talchir series represents the basal unit of the Gondwana sequence in India, characterized by glacial boulder beds that indicate a cold climate during the initial phase of deposition.
3. Approximately 98 percent of India's total coal reserves are located within the Gondwana strata, which were deposited in freshwater basins rather than marine environments.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
Statement 1 is correct as the Pachmarhi formation in the Satpura basin consists of distinct red sandstones formed during the Triassic period. Statement 2 is correct because the Talchir series marks the base of the Gondwana sequence, featuring 'Talchir Boulder Beds' that serve as evidence of the late Paleozoic glaciation. Statement 3 is correct because the vast majority of India's coal reserves (over 95-98%) are hosted in Gondwana-age freshwater basin deposits, which formed in riverine and lacustrine environments rather than marine settings.
Consider the following statements regarding Archaean Gneissic Complexes and Cratonic Nuclei:
1. The Dharwar Craton in Southern India is divided into the Western Dharwar Craton and the Eastern Dharwar Craton, separated by the Chitradurga shear zone.
2. The Aravalli Craton, situated in the northwestern part of the Indian shield, is characterized by the presence of the Banded Gneissic Complex, which represents some of the oldest crustal fragments in the region.
3. The Singhbhum Craton of Eastern India contains the Older Metamorphic Group (OMG) and the Older Metamorphic Tonalitic Gneiss (OMTG), which have been dated to approximately 3.4 to 3.5 billion years ago.
How many of the statements given above are correct?
- Only one
- Only two
- All three
- None
Explanation: Statement 1 is correct. Statement 2 is correct. Statement 3 is correct.
The Dharwar Craton is indeed bifurcated into the Western and Eastern blocks by the Chitradurga shear zone, which marks a significant tectonic boundary. The Aravalli Craton features the Banded Gneissic Complex (BGC), a critical basement rock sequence that includes some of the oldest crustal components in northwestern India. The Singhbhum Craton is geologically renowned for the Older Metamorphic Group (OMG) and Older Metamorphic Tonalitic Gneiss (OMTG), which provide evidence of early Earth crustal evolution dating back approximately 3.4 to 3.5 billion years.