Refine your search
Collections
Co-Authors
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.- 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
- 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
Abstract Views :220 |
PDF Views:0
Authors
Affiliations
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
- ASWATHANARAYANA, U. (1964) Age determination of rocks and geochronology of India. Brochure, 22nd Int. Geol. Cong., New Delhi, p. 23.
- BHOWMIK, S.K., BERNHARDT, HEINZ-J. and DASGUPTA, S. (2010) Grenvillian age high-pressure upper amphibolite-granulite metamorphism in the Aravalli-Delhi Mobile Belt, Northwestern India: New evidence from monazite chemical age and its implication. Precambrian Res., v.178, pp.168-184.
- BIJU-SHEKAR, S., YOKOYAMA, K., PANDIT, M.K., OKUDARAIA, T. YOSHIDA, M. and SANTOSH, M. (2003) Late Palaeoproterozoic magmatism in Delhi Fold Belt, NW India and its implication: evidence from EPMA chemical ages of zircons. Jour. Asian Earth Sci., v.22, pp.189-207.
- BUICK, I.S., ALLEN, C., PANDIT, M., RUBATTO, D. and HERMAN, J. (2006) The Proterozoic magmatic and metamorphic history of the Banded Gneissic Complex, central Rajasthan, India: La-ICP-MS U-Pb zircon constraints. Precambrian Res., v.151, pp.119-142.
- CHAPMAN, H.J. and RODICK, J.C. (1994) Kinetics of Pb release during zircon evaporation technique. Earth Planet. Sci. Lett., v.121, pp.601-611.
- CHOUDHARY, A.K., GOPALAN, K. and SASTRY, C. A. (1984) Present status of the geochronology of the Precambrian rocks of Rajasthan. Tectonophysics, v.105, pp.131-140.
- CRAWFORD, A. R. and COMPSTON, W., (1970) The age of Viindhyan system of Peninsular India. Quart. Jour. Geol. Soc. London, v.125, pp.351-372.
- DASGUPTA, S., GUPTA, P., SENGUPTA, P., MIURAU, H. AND EHL, J., (1997) Pressure-temperature-fluid evolutionary history of the polymetamorphic Sandmata granulite complex. Precambrian Res., v.83, pp.267-290.
- DEB, M. and THORPE, R.I. (2004) Geochronological constraints in the Precambrian Geology of Rajasthan and their metallogenic implications. In: M. Deb and W.D. Goodfellow (Eds.), Sediment-hosted Lead- Zinc Sulphide Deposits. Narosa Publishing House, New Delhi, India, pp.246-263.
- DEB, M., THORPE, R. I., CUMMING, G. L. and WAGNER, P. A. (1989) Age, source and stratigraphic implications of Pb-Isotope data for conformable, sediment hosted, base metal deposits in the Proterozoic Aravalli-Delhi orogenic belt, northwestern India. Precambrian Res., v.43, pp.1-22.
- DIRKS, P.H.G., ZHANG, J.S. and PASSCHIER, C.W. (1997) Exhumation of high-pressure granulites and the role of lower crustal advection in the North China Craton near Datong. Jour. Struc. Geol., v.19, pp.1343-1358.
- FAREEDUDDIN and KRÖNER, A. (1998) Single zircon age constraints on the evolution of Rajasthan granulite. In: B.S.Paliwal (Ed.), The Indian Precambrian. Scientific Publishers (India), Jodhpur, pp.547-556.
- GERYA, T.V., PERCHUK, L.L. MARESCH, W.V. and WILLNER, A.P. (2004) Inherent gravitational instability of hot continental crust: Implications for doming and diapirism in granulite facies terrains. In: D.L. Whitney et al. (Eds.), Gneiss domes in orogeny: Boulder, Colorado. Geol. Soc. Amer. Spec. Paper, v.380, pp.97-115
- GOPALAN, K., MACDAUGALL, J.D., ROY, A.B. and MURALI, A.V., (1990) Sm-Nd evidence for 3.3 Ga old rock in Rajasthan, north-western India. Precambrian Res., v.48, 287-297.
- GUHA, D.B. and BHATTACHARYA, A.K. (1995) Metamorphic evolution and high grade reworking of the Sandmata Complex granulites. In: K.R. Gupta and S. Sinha-Roy (Eds.), Continental crust of northwestern and central India. Mem. Geol. Surv. India, v.31, pp.163-198.
- GUPTA B. C., (1934) The Geolgy of Central Mewar. Mem. Geol. Surv. India, v.65, pp.107-168.
- GUPTA, S.N., ARORA, Y.K., MATHUR, R.K., IQBALUDDIN, PRASAD, B., SAHAI, T.N. and SHARMA, S.B. (1980) Lithostratigraphic map of the Aravalli region, southern Rajasthan and northeastern Gujarat. Geol. Surv. India, Calcutta. Scale 1:1,000,000.
- GYANI, K.C., KONILOV, A.N. and FONAREV, V.L. (2000). Granulite P-T paths and crustal evolution of southern Rajasthan. In: K.C. Gyani, P. Kataria (Eds.), Tectonomagmatism, geochemistry and metamorphism of Precambrian terrains. Proc. Nat. Sem, Department of Geology, ML Sukhadia University, Udaipur, pp.275-301.
- HERON, A. M. ,(1953) Geology of central Rajputana. Mem. Geol. Surv. India, v.79, 339p.
- KAUR, P., CHAUDHRI, N., RACZEK, I., KRÖNER, A. AND HOFMANN, A.W., (2007) Geochemistry, zircon ages and whole-rock Nd isotopic systematics for Palaeoproterozoic A-type granitoids in the northern part of the Delhi belt, Rajasthan, NW India: implications for late Palaeoproterozoic crustal evolution of the Aravalli craton. Geol. Mag., v.144 (2), pp.361-378.
- KAUR, P., CHAUDHRI, N., RACZEK, I., KRÖNER, A., HOFMANN, A.W., and OKRUSCH, M. (2011a) Zircon ages of late Palaeoproterozoic (ca.1.72-1.70 Ga) extension-related granitoids in NE Rajasthan, India: Regional and tectonic significance. Gondwana Res., v.19, pp.1040-1053.
- KAUR, P., ZEH, A., CHAUDHRI, N., GERDES, A. and OKRUSCH, M., (2011b) Archaean to Palaeoproterozoic crustal evolution of the Aravalli mountain range and its hinterland: The U-Pb and Hf Isotope records of detrital zircon. Precambrian Res., v.187, pp.155-164.
- KAUFMAN, A.J., JIAN, G., CHRISTIC-BLICK, N., BANERJEE, D. M. and RAI, V., (2006) Stable isotope record of the thermal Neoproterozoic Krol platform in the Lesser Himalayas of northern India. Precambrian Res., v.147, pp.156-185.
- KOBER, B. (1986) Whole-grain evaporation for 207Pb/206Pb investigations on single zircons using double filament thermal ion source. Contrib. Mineral. Petrol., v.93, pp.482-490.
- KOBER, B. (1987) Single zircon evaporation combined with Pb+ emitter-bedding for 207Pb/206Pb –age investigations using thermal ion mass spectrometry, and implications for zirconology. Contrib. Mineral. Petrol., v.96, pp.63-71.
- KRONER, A. and HEGNER, E. (1998) Geochemistry, single zircon ages and Sm-Nd systematics of granitoid rocks from the Góry Sowie (Owl) Mts., Polish West Sudetes: evidence for early Palaeozoic arc-related plutonism. Jour. Geol. Soc. London, v.155, pp.711-724.
- KRONER, A. and TODT, W. (1988) Single zircon dating constraining the maximum age of Berberton Greenstone Belt, southern Africa. Jour. Geophys. Res., Phase- of metamorphic v.93, pp.15329-15337.
- KRONER, A., COMPSTON, W. and WILLIAMS, I.S. (1989) Growth of early Archaean Crust in the Ancient Gneiss Complex of Swaziland as revealed by single zircon dating. Tectonophysics, v.161, pp.271-298.
- NAHA, K. and HALYBURTON, R.V., (1974) Early Precambrian stratigraphy of central and southern Rajasthan, India. Precambrian Res., v.1, pp.55-73.
- NAHA, K. and ROY, A.B. (1983) The problem of the Precambrian basement in Rajasthan, western India. Precambrian Res., v.19, pp.217–223.
- PASSCHIER, C.W., MYERS, J.S. and KRÖNER, A. (1990) Field geology of high grade terrain, Berlin: Springer Verlag, 150p.
- PERCHUK, L.L. (1989) P-T-fluid regimes of metamorphism and related magmatism. In: J.S. Daly, R.A. Cliff and B.W.D. Yardlye (Eds.), Evolution of Metamorphic belts. Blackwell Scientific Publications, Oxford, pp.275-292.
- RATHORE, S.S., VENKATESH, T. R. and SRIVASTAVA, R. K., (1999) RbSr isotope dating of Neoproteroozic (Malani Group) magmatism from southwest Rajasthan, India: evidence of younger Pan-African thermal event by 40Ar-39Ar studies. Gondwana Res., v.2 (2), pp.271-281.
- RAO, C.V.D, SANTOSH, M., PUROHIT, R., WANG, J., JIANG, X. and KUSKY, T. (2011) LA-ICP-MS U-Pb zircon age constraints on the Palaeoproterozoic and Neoarchaean history of the Sandmata Complex in Rajasthan within NW Indian Plate. Jour. Asian Earth Science. Doi :10.1016/j.jeas.2011.01.018.
- ROY, A.B. (1988). Stratigraphic and tectonic framework of the Aravalli Mountain Range. In: A.B. Roy (Ed.), Precambrian of the Aravalli Mountain, Rajasthan, India. Mem. Geol. Soc. India, no.7, pp.3-31.
- ROY, A.B. (1990) Evolution of early Precambrian crust of the Aravalli Mountain range. In: S.M. Naqvi (Ed.), Precambrian Continental Crust and its Economic Resources. Development of Precambrian Geology, Elsevier, pp.327-348.
- ROY, A.B. (2006) Proterozoic lithostratigraphy and Geochronologic framework of the Aravalli Mountains and adjoining areas in Rajasthan and neighbouring states, northwest India. Indian Jour. Geol., v.78, pp.5-18.
- ROY, A.B. and DAS, A.R. (1985) A study of time relation between movements, metamorphism and granite emplacement in the middle-Proterozoic Delhi Supergroup of Rajasthan. Jour. Geol. Soc. India, v.26, pp.726-733.
- ROY, A.B. and KRÖNER, A. (1996) Single zircon evaporation ages constraining the growth of the Archaean Aravalli craton, northwestern Indian shield. Geol. Mag. v.133, pp.333-342.
- ROY, A.B. and RATHORE, S. (1999) Tectonic setting and model of evolution of granulites of the Sandmata Complex, the Aravalli Mountain, Rajasthan. In: International Symposium on Charnockite and Granulite Facies Rocks, Geologists Assoc. Tamil Nadu, pp.111-126.
- ROY, A.B., KRÖNER, A. and LAUL, V. (2001) Detrital zircons constraining basement age in a late Archaean greenstone belt of south-eastern Rajasthan, India. Curr. Sci., v.81, pp.407-410.
- ROY, A.B., KRÖNER, A., BHATTACHARYA, P.K. and RATHORE, S. (2005) Metamorphic evolution and zircon geochronology of early Proterozoic granulites in the Aravalli Mountains of northwestern India. Geol. Mag., v.142, pp.287-302.
- ROY, A.B., NAGORI, D., GOLANI, P.R., DHAKAR, S.P. and CHOUDHURI, R. (1980) Structural geometry of the phosphorite bearing Aravalli rocks around Jhamarkortra Mines area, Udaipur dist., Rajasthan. Indian Jour. Earth Sci., v.7, pp.191-202.
- SANDIFORT, M, and POWELL, R. (1986) Deep crustal metamorphism continental extension modern and ancient examples. Earth Planet. Sci. Lett., v.79, pp.151-158.
- SAHA, L., BHOWMIK, S.K., FUKUOKA, M. and DASGUPTA, S. (2008) Contrasting episodes of Regional Granulite–Facies metamorphism in enclaves and host gneisses from the AravalliDelhi Mobile Belt, NW India. Jour. Petrol., v.49, pp.107-128.
- SARANGI, S., GOPALAN, K., ROY, A.B., SREENIVAS, B. and DAS SHARMA, S., (2006) Pb-Pb age of the carbonates of Jhamarkotra Formation constraining the age of the Aravalli Supergroup, Rajasthan. Jour. Geol. Soc. India, v.67(4), pp.442-446.
- SARKAR, G., BARMAN, T.R. and CORFU, F., (1989) Timing of continental arc magmatism in northwest India: evidence from U–Pb geochronology. Jour. Geol. v.97, pp.607-612.
- SHARMA, R.S. (1988) Patterns of metamorphism in the Precambrian rocks of the Aravalli mountain belt. In: A.B. Roy (Ed.), Precambrian of the Aravalli Mountains, Rajasthan, India. Mem. Geol. Soc. India, no.7, pp.33-76.
- SHARMA, R.S. (2010) Cratons and Fold Belts of India, Lecture Notes in Earth Sciences, v.127, Springer Verlag, 304p.
- SCHLEICHER, H., TODT, W., VILADKAR, S.G. and SCHIMDT, F. (1997) Pb-Pb age determinations of the Newania and Savattur carbonatites of India: evidence for multiple stage histories. Chem. Geol., v.140, pp.261-273.
- SRIVASTAVA, D.C. (2001) Deformation Pattern in the Precambrian Basement around Masuda, central Rajasthan, India. Jour. Geol. Soc. India. v.57, pp.197-222.
- SRIVASTAVA, D.C., SAHAY, A., KUMAR, D. and MUKHERJEE, P. (2004) Origin and ductile shearing of the microgranitoid enclaves in the granulite granitoid terrane around Devariya-Bandanwara area, central Rajasthan. Jour. Geol. Soc. India, v.63, pp.587-610.
- TORSVIK, T.H., CHARTER, L.M., ASHWAL, L.D. BHUSHAN, S.K., PANDIT, M.K., and JAMVEIT, B. (2001) Rodinia redefined or obscured: palaeomagnetism of the Malaniigneous suite (NW India). Precambrian Res., v.108, pp.319-333.
- TUCKER, R.D., ASHWAL, L.D., and TORSVIK, T.H.M (2001) U-Pb geochronology of Sychelles granitoids: Neoproterozoic continental arcfragment. Earth Planet. Sci. Lett., v.187, pp.27-38.
- VOLPE, A. M. and MACDAUGALL, J. D. (1990) Geochemistry and isotope characteristics of mafic (Phulad Ophiolite) and related rocks in the Delhi Supergroup, Rajasthan, India: Implications for rifting in the Proterozoic. Precambrian Res., v.48, pp.167-191.
- WIEDENBECK, M. and GOSWAMI, J.N. (1994) An ion-probe single zircon 207Pb/206Pb age from Mewar Gneiss at Jhamarkotra, Rajasthan. Geochim. Cosmochim. Acta v.58, pp.2135-2141.
- WIEDENBECK, M., GOSWAMI, J.N. and ROY, A.B. (1996a) Stabilization of the Aravalli craton of the northwestern India at 2.5 Ga.: An ion-microprobe zircon study. Chem. Geol., v.129, pp.325-340.
- WIEDENBECK, M., GOSWAMI, J.N. and ROY, A.B. (1996b) An ion microprobe study of single zircons from Amet granite, Rajasthan. Jour. Geol. Soc. India, v.48, pp.127-137.
- 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
Abstract Views :187 |
PDF Views:140
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 2 (2012), Pagination: 291-292Abstract
No Abstract.Full Text
References
- BUICK, I.S., ALLEN, C., PANDIT, M., RUBATTO, D. and HERMAN, J. (2006) The Proterozoic magmatic and metamorphic history of the Banded Gneissic Complex, central Rajasthan, India: La- ICP-MS U-Pb zircon constraints. Precambrian Res., v.151, pp.119-142.
- GUHA, D.B. and BHATTACHARYA, A.K. (1995) Metamorphic evolution and high grade reworking of the Sandmata Complex granulites. In: K.R.
- Gupta and S. Sinha-Roy (Eds.), Continental crust of northwestern and central India. Mem. Geol. Surv. India, v.31, pp.163-198.
- GUPTA, B.C., (1934) The Geolgy of Central Mewar. Mem. Geol. Surv. India, v.65, pp.107-168.
- GUPTA, S.N., ARORA, Y.K., MATHUR, R.K., IQBALLUDDIN, PRASAD, B., SAHAI, T.N. and SHARMA, S.B. (1980) Lithostratigraphic map of the Aravalli region, southern Rajasthan and northeastern Gujarat. Geol. Surv. India, Calcutta. Scale 1:1,000,000.
- ROY, A.B., KRONER, A., BHATTACHARYA, P.K. and RATHORE, S. (2005) Metamorphic evolution and zircon geochronology of early Proterozoic granulites in the Aravalli Mountains of northwestern India. Geol. Mag., v.142, pp.287-302.
- SAHA, L., BHOWMIK, S.K., FUKUOKA, M. and DASGUPTA, S. (2008) Contrasting episodes of Regional Granulite–Facies metamorphism in enclaves and host gneisses from the Aravalli- Delhi Mobile Belt, NW India. Jour. Petrol., v.49, pp.107-128.
- SHARMA, R.S., SILLS, J.D. and JOSJI, M. (1987) Mineralogy and metamorphic history of norite dykes within granulite facies gneisses from Sandmata, Rajasthan, NW India. Mineral. Mag., v.51, pp. 207-215.
- SINHA-ROY, S., GUHA, D.B. and BHATTACHARYA, A.K. (1992) Polymetamorphic granulite facies pelitic gneisses of the Precambrian Sandmata complex, Rajasthan. Indian Minerals, v.48(1), pp.1-12.