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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Purohit, Ritesh

Geographical Location of Vedic Irina in Southern Rajasthan

Current Seismicity in Northern Maharashtra and Southern Gujarat: Implications of Plume Tectonics

Tectonostratigraphic Status of the Proterozoic Babarmal Pink Marble from the Aravalli Supergroup

Abstract Views :196 | PDF Views:0

Authors

Ritesh Purohit ¹, Harsh Bhu ², Prakshal Mehta ², P. C. Avadich ²

Affiliations
1 Department of Geology, Government College, Sirohi - 307 001, IN
2 Department of Geology, M.L. Sukhadia, University, Udaipur - 313 00, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 2 (2012), Pagination: 135-150

Abstract

Present study reviews the tectono-stratigraphic status of Babarmal pink marble from the Aravalli Supergroup through mapping and petrographic study of marble as well as associated lithologies. The pink marble is predominantly calcitic and characteristically different from dolomitic carbonate rocks of the Jhamarkotra Formation, the Lower Aravalli Group. The marble is devoid of organic matter and phosphate content unlike the Jhamarkotra dolomite. The pink marble is underlain by quartz-pebble rich conglomerate. This assemblage represents a rare lithological association which has not been reported so far from the Aravalli Supergroup.

Besides the above differences between the Babarmal pink marble and the Jhamarkotra dolomite we also noted significant similarities between the two with respect to greenschist facies metamorphism and three phases of deformational history. Similarities in both these aspects imply that the pink marble like the Jhamarkotra dolomite can be corroborated with the Aravalli orogenic cycle. While on the basis of distinguishing lithological and petrographic features the pink marble-pebbly conglomerate, the lithoassemblage is suggested to be designated as "Babarmal Formation" as a modification to the Babarmal Formation of Gupta et al. (1997) which constituted of pink marble.

The outcrop patterns on the high resolution map shows that the Babarmal litho-assemblages are sandwiched between the Barytes bearing meta-volcanics (that represent the underlying Delwara Formation) and the dolomite-quartzite-phyllite (that represent the overlying Jhamarkotra Formation) of the Lower Aravalli Group (Roy and Jakhar, 2002). Hence we suggest to place the Babarmal Formation as the middle stratigraphic unit of the Lower Aravalli Group of the Aravalli Supergroup.

Keywords

Tectonics, Stratigraphy, Proterozoic, Pink Marble, Pebbly Conglomerate, Babarmal, Aravalli Supergroup.

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References

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ROY, A.B., SHARMA, B.L., PALIWAL, B.S., CHAUHAN, N.K., NAGORI, D.K., GOLANI, P.R., BEJARNIYA, B.R., BHU, H. and SABAH, M. ALI (1993) Lithostratigraphy and tectonic evolution of the Aravalli Supergroup - A protogeosynclinal sequence. In: S.M. Kassyap (Ed.), Rift basins and aulacogens, Gyanodaya Prakashan, Nainital. pp.73-90.

SARANGI, S., GOPALAN, K., ROY, A. B., SREENIVAS, B. and DAS SHARMA, S. (2006) Pb-Pb age of carbonates of Jhamarkotra Formation: constraints on the age of Aravalli Supergroup, Rajasthan. Jour. Geol. Soc. India, v.67, pp.442-446.

WIEDENBECK, M., GOSWAMI, J.N. and ROY, A.B. (1996) Stabilization of the Aravalli craton of the north-western India at 2.5 Ga: An ion-microprobe zircon study. Chemical Geol., v.129, pp.325-340.

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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Authors

A. B. Roy ¹, Alfred Kroener ², Sanjeev Rathore ³, Vivek Laul ⁴, Ritesh Purohit ⁵

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

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 4 (2012), Pagination: 323-334

Abstract

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.

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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

Abstract Views :187 | PDF Views:140

Authors

A. B. Roy , Alfred Kroner , Sanjeev Rathore , Vivek Laul , Ritesh Purohit

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 2 (2012), Pagination: 291-292

Abstract

No Abstract.

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References

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