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Co-Authors
- B. S. Paliwal
- O. P. Goel
- P. R. Golani
- B. R. Bejarniya
- A. R. Das
- K. S. Valdiya
- M. Wiedenbeck
- J. N. Goswami
- S. Sarangi
- K. Gopalan
- B. Sreenivas
- S. Das Sharma
- M. S. Sethumadhav
- Alokesh Chatterjee
- N. K. Chauhan
- Krishan Dutt
- Sanjeeb Rathore
- Harsh Bhu
- Pankaj Sharma
- Kishan Vaishnav
- Alfred Kroener
- Sanjeev Rathore
- Vivek Laul
- Ritesh Purohit
- H. N. Bhattacharya
- Alfred Kroner
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Roy, A. B.
- Superposed Folding in the Aravalli Rocks of the Type Area around Udaipur, Rajasthan
Abstract Views :198 |
PDF Views:2
Authors
Affiliations
1 Department of Geology, University of Rajasthan, Udaipur, IN
1 Department of Geology, University of Rajasthan, Udaipur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 12, No 4 (1971), Pagination: 342-348Abstract
Around Udaipur, the Precambrian rocks belonging to the Aravalli System are represented by feldspathic greywacke grading to phyllite and mica schist, calc-arenite, and ferruginous and carbonaceous quartzites. The rocks display a high degree of structural complexity resulting from the impress of three distinct periods of folding (F1, F2 and F3). The earliest folding movement (F1) produced tight to isoclinal folds with drawn-out hinges. The F1 folds are accompanied by a set of very well developed axial plane schistosity. These folds are presumed to have been initially recumbent with E-W to NW-SE axial trend. The second fold movement (F2) refolded the F1 folds to upright, open to occasionally isoclinal folds. The F2 folds have variable plunge and an overall northerly axial trend. The third fold movement has resulted in the formation of tight to isoclinal folds (F3) of small and intermediate scales on the limbs of larger F2 folds. The F3 folds are characterized by a set of axial plane crenulation cleavages. The superposition of the three fold systems has resulted in complex interference patterns on different scales.
- The Ahar River Granite, Its Stratigraphic and Structural Relations with the Early Proterozoic Rocks of South-Eastern Rajasthan
Abstract Views :207 |
PDF Views:4
Authors
Affiliations
1 Department of Geology, University of Rajasthan, Udaipur 313 001, IN
2 Geological Survey of India, Assam-Meghalaya Circle, Shillong 793003, IN
1 Department of Geology, University of Rajasthan, Udaipur 313 001, IN
2 Geological Survey of India, Assam-Meghalaya Circle, Shillong 793003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 5 (1985), Pagination: 315-325Abstract
The Ahar River granite near Udaipur city, considered by Heron as intrusive into the Aravalli rocks of early Proterozoic age, is a coarse-grained, massive, leucocratic rock except along the outcrop margins. The granite ranges in composition from alkali granite to granodiorite and tonalite, with about 5% ferromagnesian minerals. The enveloping Aravalli metasediments form a continuous sequence starting with greenschist (metavolcanics) and quartzite (locally conglomerate) along the granite contact. The stratigraphic position of the Ahar River granite in relation to the surrounding metasediments suggests that the granite is the basement rock. The granite characteristically shows post-crystalline deformation of the constituent grains, specially quartz and feldspar; and the granite-cover contacts are marked by ductile shear zones developed during the earliest deformation of the Aravalli rocks.- A Study on the Time Relations Between Movements, Metamorphism and Granite Emplacement in the Middle Proterozoic Delhi Supergroup Rocks of Rajasthan
Abstract Views :183 |
PDF Views:2
Authors
Affiliations
1 Department of Geology, University of Rajasthan, Udaipur 313 001, IN
2 B-2, Dhruv Marg, Tilaknagar, Jaipur 302 004, IN
1 Department of Geology, University of Rajasthan, Udaipur 313 001, IN
2 B-2, Dhruv Marg, Tilaknagar, Jaipur 302 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 10 (1985), Pagination: 726-733Abstract
The Delhi Supergroup rocks, an important tectonic-stratigraphic unit of the Aravalli Mountains, are affected by multiple folding and polyphase metamorphism. Three generations of deformational structures have been recognized in these rocks (DFI, DF2 and DF3). DFI structures which include a set of isoclinal folds with penetrative axial planar schistosity, were deformed successively by DF2 and DF3 folding movements. Microtcxtural studies of rocks yielded evidence for two metamorphic events-a progressive metamorphism (M1) rising upto epidote amphibolite facies, followed by a retrogressive phase (M3) under greenschist facies condition. Field and microscopic studies indicate that both DF1 and DF2 structures were formed during Ml phase, and DF3 structures were formed during the retrogressive phase (M2). The metamorphic climax of M1 phase was during the early phase of DF2, and the granites emplaced coevally with this event indicated ca. 1450 Ma Rb/Sr isochron age. No definite relationship could be established for the 850-700 Ma secondary (mineral) ages with DF3 deformation and M2 metamorphism.- Intracontinental Fold Belts: Case Studies in the Variscan Belt of Europe and the Damara Belt in Namibia
Abstract Views :201 |
PDF Views:121
Authors
Affiliations
1 University of Rajasthan, Udaipur, IN
1 University of Rajasthan, Udaipur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 10 (1985), Pagination: 759-759Abstract
No Abstract.Full Text
- Phosphorite
Abstract Views :175 |
PDF Views:131
Authors
Affiliations
1 University of Rajasthan, Udaipur, IN
1 University of Rajasthan, Udaipur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 26, No 12 (1985), Pagination: 902-903Abstract
No Abstract.Full Text
- Tectonometamorphic Evolution of the Great Himalayan Thrust Sheets in Garhwal Region, Kumaun Himalaya
Abstract Views :229 |
PDF Views:3
Authors
A. B. Roy
1,
K. S. Valdiya
2
Affiliations
1 University of Rajasthan, Udaipur 313 001, IN
2 Kumaun University, Nainital 263 001, IN
1 University of Rajasthan, Udaipur 313 001, IN
2 Kumaun University, Nainital 263 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 32, No 2 (1988), Pagination: 106-124Abstract
The so-called 'Central Crystallines' building the bulk of the Great Himalaya (=Himadri) comprise two major tectonic units. The upper unit is constituted of highgrade psammitic metamorphics associated with anatectic granites of the Vaikrita Group, and the lower unit is made up of Precambrian granites, gneisses, amphibolites, meta-sediments and their mylonitic equivalents recognized as the Munsiari Formation. The Vaikrita Group makes a huge lithotectonic slab bounded by moderately inclined Main Central (Vaikrita) Thrust in the south and the steeply dipping Trans-Himadri (Malari) Thrust in the north. Sandwiched between the Munsiari and the Main Central (Vaikrita) Thrusts, the Munsiari is a severely tectonized and drastically condensed lithotectonic sheet representing the ischolar_main zone of the Lesser Himalayan crystalline nappes.
In small-scale, the Vaikrita shows extremely intricate internal deformation resulting from polyphasal folding and repeated transposition of foliation planes. The bulk non-coaxial strain in the rocks is attributable to the variation in the case of slip on the shear planes during thrust propagation. The period of thrusting is coeval with the main phase of progressive metamorphism, anatexis and attendant granite emplacement during the late Eocene to Lower Miocene period. Later deformation and retrogressive metamorphism are related to the uplift during the Middle and Upper Miocene, culminating in the Middle Pleistocene, when the Vaikrita rocks were brought to a brittle field of deformation from the earlier ductile and brittle-ductile fields.
The Vaikrita exhibits an abrupt rise in the grade of metamorphism to sillimanite zone of progressive (Barrovian type) metamorphism from a very low to medium grade of (Himalayan) metamorphism in the Munsiari. In the deeper level (∼30 km), the Vaikrita rocks underwent progressive regional metamorphism and anatexis that gave rise to granites, which extensively invaded the metamorphics. The episodic uplift of the Vaikrita Group was due to the shifting of thrust movements by relay from the Main Central (Vaikrita) Thrust, to the Munsiari Thrust and the other minor thrusts of the schuppen zone in the south. A part of the uplift can be attributed to the diapiric rise of the anatectic granites.
- An Ion Microprobe Study of Single Zircons from the Amet Granite, Rajasthan
Abstract Views :191 |
PDF Views:1
Authors
Affiliations
1 Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, IN
2 Department of Geology, M.L. Sukhadia University, Udaipur - 313 001, IN
1 Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, IN
2 Department of Geology, M.L. Sukhadia University, Udaipur - 313 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 48, No 2 (1996), Pagination: 127-137Abstract
We have lIsed an ion microprobe to measure 207Pb/206Pb ages on carefully selected ∼20 μm domains of single zircons from two samples of the Amet Granite. A sample of the Amet Granite, consisting of a strongly foliated augen gneiss, yields a minimum crystallization age of 1641±14 Ma (1σ). From a second sample, collected from an aplite dyke which cross-cuts the foliation of the augen gneiss, we calculate a minimum emplacement age of 1766±16 Ma; both these ages are based on a dynamic background correction of 0.01 c/s.
As part of this study we conducted 30 analyses of an internal standard which has a published, concordant age of 2631±4 Ma. Our data suggest that a low intensity dynamic background (≤0.01 c/s), comparable to the 204Pb count rate, is present within our system. This background could, in principle, lead to considerable uncertainties when calculating 206Pb/204Pb ages for young samples which have low radiogenic 206Pb concentrations. We believe an inaccurate background correction is the most likely explanation why the cross-cutting dyke yields an apparent age which is older than that obtained from its host rock. Assuming that the dynamic background was negligible at the time of its analysis. we recalculate an age of 1646±19 Ma for the dyke sample which is statistically indistinguishable from the age of the augen gneiss. The use of small geometry ion microprobes for obtaining 207Pb/206Pb age is best suited for older and radiogenic Pb-rich zircon, when such a low intensity background becomes less significant.
Our results indicate that the crystallization of the Amet porphyritic granite, the tectonic emplacement of the nearby mid-Proterozoic Sand Mata granulites and the subsequent deformation are the products of a single tectonic cycle which was completed by ∼ 1.64 Ga.
Keywords
Geochronology, Zircon, Granites, Aravalli Mountains, Rajasthan.- Pb-Pb Age of Carbonates of Jhamarkotra Formation: Constraints on the Age of Aravalli Supergroup, Rajasthan
Abstract Views :190 |
PDF Views:2
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
2 Jai Narayan Vyas University, Jodhpur - 342 00 1, IN
1 National Geophysical Research Institute, Hyderabad - 500 007, IN
2 Jai Narayan Vyas University, Jodhpur - 342 00 1, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 4 (2006), Pagination: 442-446Abstract
Pb-Pb isochron age of carbonate rocks of the Jhamarkotra Formation of the Aravalli Supergroup from the Udaipur sector in Rajasthan has been measured for the first time as 1921±67 Ma (2σ). We consider this as a reset age, as it is indistinguishable from the earlier reported Rb-Sr isochron age of 1900±8O Ma for the Darwal Granite formed synkinematically with the Aravalli deformation. The depositional age of the Jhamarkotra carbonates could be 200-300 Ma older as suggested by the positive δ13C anomalies noted in these carbonate rocks.Keywords
Pb-Pb Isochron Age, Carbonates, Aravalli Supergroup Rajasthan.- The 'mystic' Sand Dune-Covered Temples of Talakad, Mysore District, Karnakata: Evidence of Earthquake-Related Destruction
Abstract Views :259 |
PDF Views:86
Authors
Affiliations
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 Department of Earth Science, University of Mysore, Mysore 570 006, IN
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 Department of Earth Science, University of Mysore, Mysore 570 006, IN
Source
Current Science, Vol 107, No 2 (2014), Pagination: 246-254Abstract
Low-lying sediment mound, known as Talakad sand dunes, on the left bank of the meandering Kaveri River at Talakad, Mysore district, Karnataka, is an enigmatic geomorphic feature. Archaeological excavations in the area revealed the presence of a cluster of ancient temples, mostly in dilapidated condition, which were presumably built during the time-period dating back between 6th and 17th century AD. It is generally believed that the temples were entombed under a pile of riverine sand dunes during the 'ecodisaster' that lashed the region in the 17th century. Our field studies coupled with archaeological reports on excavations indicate that the mound is not entirely made of dune sands. Virtual absence of sand deposits over some severely damaged temples occurring near the top suggests that destruction could not have taken place only because of the load of the overlying sands. On the other hand, the scale of destruction witnessed in some of the affected temples can only be explained by the incidence of earthquakes of high magnitude. Additional proof of earthquake-related destruction comes from the occurrence of sedimentary layers (beds) containing fragmented pieces of building materials like bricks and stones in silt and clay-bearing flood plain deposits at the sites of the destructed temples and other buildings. Historical records of repeated renovation or rebuilding of temples at the same place provide further proof of recurrent incidence of earthquake-related destruction. Geomorphic changes manifested in the form of shifting of river courses consequent with the rise of the sediment mound also indicate uplift-related earth movements which must have ensued repeated earthquakes in the region.Keywords
Ancient Temples, Disaster Archaeology, Neotectonic Landform Changes, Palaeoseimicity, Sand Dunes.Full Text
- Tectonic Framework and Evolutionary History of the Bengal Basin in the Indian Subcontinent
Abstract Views :299 |
PDF Views:120
Authors
Affiliations
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 Hoogli Moshin College, Hoogli 712 101, IN
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 Hoogli Moshin College, Hoogli 712 101, IN
Source
Current Science, Vol 109, No 2 (2015), Pagination: 271-279Abstract
The Bengal Basin evolved as a rift-controlled extensional basin along the NNE-SSW trending Basin Margin Fault coevally with the 85° East Ridge in the Bay of Bengal during the short-lived hotspot activity south of Bhubaneswar. The basin opening post-dated the Kereguelen Plume magmatism (at ~116 Ma), but predated the phase of continental collision that triggered the rise of the Himalaya in the north. Supply of sediments in the initial stages of basin opening was from the west, mainly through the denudation and erosion of the uplifted Precambrian Shield. Following virtually similar tectonic and depositional pattern in the entire basin, an abrupt change in depositional pattern was recorded during the Oligocene with the emergence of easterly source of sediments derived from the uplifting of Indo-Myanmarese Ranges. Between the Oligocene and Late Pleistocene different parts of the Sylhet Trough (the best-studied region in the deeper part of the Bengal Basin) received huge volumes of sediments, which resulted in deposition measuring between 10 km and over 17 km in thickness. This was followed by an equally sudden drop in the sediment supply from the east due to the basin inversion concurrently with the westward advance of the Indo-Burmese mountain front during early and mid-Pleistocene. Followed by a short hiatus, the depositional scenario changed completely with the arrival of thick volumes of sediment during the late Pleistocene-Holocene, which covered the entire Bengal basin with the sediments brought by the Ganga and Brahmaputra from the Himalayan sources.Keywords
Basin Evolution Tectonics, Extensional Rift Basin, Depositional Pattern, Palaeogeographic Setting, Sediment Supply.Full Text
- Kachchh Mesozoic Domes, Western India: Study of Morphotectono Character and Evolution
Abstract Views :195 |
PDF Views:101
Authors
Affiliations
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 Department of Geology, ML Sukhadia University, Udaipur 313 001, IN
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 Department of Geology, ML Sukhadia University, Udaipur 313 001, IN
Source
Current Science, Vol 107, No 4 (2014), Pagination: 688-693Abstract
Kachchh domes are recognized by the oval to elliptical- shaped outcrop patterns marked by outlines of bedding surfaces which invariably dip in the outward directions. The occurrence of domes in rows without having corresponding basin-like features implies that these are not superposed folds resulting due to constriction- type tectonic forces. Further, in spite of the close time-space relationship, the occurrence of domes is exclusively in the Mesozoic rocks on the uplifted block of the fault. The absence of any such rock formation on the other side of the fault rules out the possibility that these are 'drape folds' developed during the adjustment of the sedimentary blanket over the faulted-up edges of the basement blocks. Hinging on the evidence of intrusive plutonic (mafic) masses in the core of some of the domes, we suggest that the structures evolved through diapiric rise of magma bodies causing dome-shaped up-warping (bending) of the pre-existing (Mesozoic) flat-lying sedimentary formations. Linear disposition of domes is explained as due to channellization of magma along the fractures that developed around large-scale crustal doming during the early phase of the Reunion Plume impingement under the Indian Lithosphere.Keywords
Diapiric Folds, Domes, Evolutionary History, Magma Bodies.Full Text
- Development of Ductile Shear Zones during Diapiric Magmatism of Nepheline Syenite and Exhumation of Granulites-Examples from Central Rajasthan, India
Abstract Views :226 |
PDF Views:96
Authors
Affiliations
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 H. No. 20/75, Mansarovar, Jaipur 302 020, IN
3 No. 301, A.R. Complex, I-Block, Sector-14, Hiran Magri, Udaipur 313 001, IN
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 H. No. 20/75, Mansarovar, Jaipur 302 020, IN
3 No. 301, A.R. Complex, I-Block, Sector-14, Hiran Magri, Udaipur 313 001, IN
Source
Current Science, Vol 110, No 6 (2016), Pagination: 1094-1101Abstract
The present communication discusses two separate instances where features commonly observed in DSZ are noted, one along the margin of the Kisengarh nepheline syenite and the other in the granulite bodies the Sandmata Complex in Rajasthan, India. The foliations in the nepheline syenite pluton show features similar to the mylonite gneisses that characterize DSZs in orogenic belts. Apart from simulating LS tectonite- type fabric the continuity of similar structures in adjacent cover rocks provides evidence of heterogeneous deformation during upward ascent of nepheline syenite. Based on tectono-metamorphic studies on granulites suggestion is made about the uplift of deepseated granulites accompanied by ductile shearing on along the margins. The development of DSZ along margins helped in reducing the frictional resistance during upward ascent and emplacement into Archaean gneissic terrane. The process is comparable to buoyancy- induced diapiric uplift of hot plutonic bodies through cooler upper crust.Keywords
Ductile Shear Zone, Diapiric Magmatism, Exhumation of Granulites, Emplacement of Plutonic Bodies.Full Text
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- Bhawani Shankar Paliwal (1946-2011)
Abstract Views :198 |
PDF Views:124
Authors
Affiliations
1 Kolkata, IN
1 Kolkata, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 3 (2011), Pagination: 284-284Abstract
No Abstract.Full Text
- Malani Igneous Suite of Rocks
Abstract Views :193 |
PDF Views:146
Authors
Affiliations
1 Department of Geology, Mohanlal Sukhadia University, Udaipur 313003, IN
1 Department of Geology, Mohanlal Sukhadia University, Udaipur 313003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 4 (1998), Pagination: 556-557Abstract
No Abstract.Full Text
- Deserted Nineteenth Century Paliwal Villages around Jaisalmer, Western Rajasthan, India:Historical Evidence of Palaeoseismicity
Abstract Views :222 |
PDF Views:109
Authors
Affiliations
1 Niloy Apartment, Flat 3/2G, 46A, R.N. Das Road, Kolkata 700 031, IN
2 Department of Geology, Mohanlal Sukhadia University, Udaipur 313 001, IN
1 Niloy Apartment, Flat 3/2G, 46A, R.N. Das Road, Kolkata 700 031, IN
2 Department of Geology, Mohanlal Sukhadia University, Udaipur 313 001, IN
Source
Current Science, Vol 112, No 02 (2017), Pagination: 402-405Abstract
Seismicity or seismic susceptibility implies proneness to earthquake incidence in a region. For this we cannot depend entirely on instrumental records, because this facility was almost unknown about 70-odd years ago, whereas the 'period of quiescence' between two successive major earthquakes in a region may be hundreds of years and sometimes more. This places a severe constraint on the understanding of the regional variability of seismic susceptibility or the proneness of any particular region to the occurrence of an earthquake. In such cases, the necessity is to look for evidence of palaeoseismicity in historic/pre-historic and archaeological records, and for much older events the different fault features preserved in geomorphic features. Here we cite an incidence of seismic event based on the examination of a large number of deserted early nineteenth century houses scattered around Jaisalmer region in western Rajasthan, India. Lying unoccupied for about 190 years or more, evidence of destruction is observed in each and every house, which is not generally witnessed in disused old houses standing for hundred years or more. Looking into the nature of collapse-related flattening features such as collapsed roofs, fallen joists, lintels and pillars in all these houses, we suggest that these are manifestations of earthquake-related destruction. Such an assumption finds strong support from the observed evidence of recent tectonic activities and from the observed ground movements along several major faults in the region covering Jaisalmer and the adjoining areas.Keywords
Deserted Paliwal Villages, Evidence of Recent Tectonics, Earthquake Related Destruction, Historical Evidence of Earthquake, Palaeoseismicity.Full Text
- Geological Evolution of Kachchh:An Epitome of Successive Phanerozoic Events
Abstract Views :204 |
PDF Views:100
Authors
Affiliations
1 Niloy Apartment, Flat 3/2G, 46A, R.N. Das Road, Kolkata 700 031, IN
2 Geology Department, Hooghly Mohsin College, Chinsura 712 101, IN
3 1014 Hiran Magri, Sector 4, Udaipur 310 002, IN
1 Niloy Apartment, Flat 3/2G, 46A, R.N. Das Road, Kolkata 700 031, IN
2 Geology Department, Hooghly Mohsin College, Chinsura 712 101, IN
3 1014 Hiran Magri, Sector 4, Udaipur 310 002, IN
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Current Science, Vol 112, No 05 (2017), Pagination: 1051-1056Abstract
Kachchh geological province is conventionally referred to as 'Kachchh basin' or 'Kachchh rift basin' or even 'Kachchh aulacogen'. The geological records, however, recount a different history of the diverse depositional environment under diverse tectonic situations. The earliest Phanerozoic event was the deposition of Palaeozoic sediments during upper Permian and lower Triassic. Next event was a major marine incursion along rift zones coinciding with the Gondwana break-up and the initiation of northward drifting of the 'Indian land mass'. This was followed by the Reunion Plume related magmatism centring on the K- T boundary. Overlying this occur lignite deposits in the Naredi Formation correlatable with the global Eocene excursion. The Cenozoic basin closure corresponds to the major uplift in the Himalayas during the early Quaternary. Finally, the evidence of recurrent youngest block-movement-type active tectonics transformed the terrain into a zone of high seismicity.Keywords
Cenozoic Depositories, Kachchh, Palaeocene–Eocene Thermal Maximum, Phanerozoic Events, Quaternary.Full Text
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1 Niloy Apartment, Flat 3/2G, 46A, R.N. Das Road, Kolkata 700 031, IN
1 Niloy Apartment, Flat 3/2G, 46A, R.N. Das Road, Kolkata 700 031, IN
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Current Science, Vol 114, No 05 (2018), Pagination: 946-946Abstract
We must thank Bahadur et al. for mentioning the date of what they consider as the ‘Great migration’. Our suggestion about earthquake-related devastation was based on the field examination of different villages where the Paliwal Brahmins lived. We presented some telltale evidence of destruction of houses made of blocks of rocks without using any cementing materials. The earthquake-related destruction features in the poorly constructed stone-block houses of Kuldhar and other Paliwal villages were similar to those destroyed during the Latur earthquake in the recent past, and at about 4000 years ago site at the historical Mohenjodaro.Full Text
- Tectono-Metamorphic and Geochronologic Studies from Sandmata Complex, Northwest Indian Shield: Implications on Exhumation of Late-Palaeoproterozoic Granulites in an Archaean-Early Palaeoproterozoic Granite-Gneiss Terrane
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1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 Institut fur Geowissenchaften, Universitaet Mainz, 55099 Mainz, DE
3 3/2 Kanji Ka Hata, Udaipur 313 001, IN
4 10/805, Malviya Nagar, Jaipur 302017, IN
5 Department of Geology, Government College, Sirohi 327001, IN
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 Institut fur Geowissenchaften, Universitaet Mainz, 55099 Mainz, DE
3 3/2 Kanji Ka Hata, Udaipur 313 001, IN
4 10/805, Malviya Nagar, Jaipur 302017, IN
5 Department of Geology, Government College, Sirohi 327001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 4 (2012), Pagination: 323-334Abstract
Several bodies of granulites comprising charnockite, charno-enderbite, pelitic and calc-silicate rocks occur within an assemblage of granite gneiss/granitoid, amphibolite and metasediments (henceforth described as banded gneisses) in the central part of the Aravalli Mountains, northwestern India. The combined rock assemblage was thought to constitute an Archaean basement (BGC-II) onto which the successive Proterozoic cover rocks were deposited. Recent field studies reveal the occurrence of several bodies of late-Palaeoproterozoic (1725 and 1621 Ma) granulites within the banded gneisses, which locally show evidence of migmatization at c. 1900 Ma coeval with the Aravalli Orogeny. We report single zircon 'evaporation' ages together with information from LA-ICP-MS U-Pb zircon datings to confirm an Archaean (2905 - ca. 2500 Ma) age for the banded gneisses hosting the granulites. The new geochronological data, therefore, suggest a polycyclic evolution for the BGC-II terrane for which the new term Sandmata Complex is proposed. The zircon ages suggest that the different rock formations in the Sandmata Complex are neither entirely Palaeoproterozoic in age, as claimed in some studies nor are they exclusively Archaean as was initially thought. Apart from distinct differences in the age of rocks, tectono-metamorphic breaks are observed in the field between the Archaean banded gneisses and the Palaeoproterozoic granulites. Collating the data on granulite ages with the known tectono-stratigraphic framework of the Aravalli Mountains, we conclude that the evolution and exhumation of granulites in the Sandmata Complex occurred during a tectono-magmatic/metamorphic event, which cannot be linked to known orogenic cycles that shaped this ancient mountain belt. We present some field and geochronologic evidence to elucidate the exhumation history and tectonic emplacement of the late Palaeoproterozoic, high P-T granulites into the Archaean banded gneisses. The granulite-facies metamorphism has been correlated with the thermal perturbation during the asymmetric opening of Delhi basins at around 1700 Ma.Keywords
Geochronology, Granulite Exhumation, Sandmata Complex, Aravalli Mountains.References
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- Tectono-Metamorphic and Geochronologic Studies from Sandmata Complex, Northwest Indian Shield: Implications on Exhumation of Late-Palaeoproterozoic Granulites in an Archaean-Early Palaeoproterozoic Granite-Gneiss Terrane
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 2 (2012), Pagination: 291-292Abstract
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References
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