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Book Chapter

Provenance, timing of sedimentation and metamorphism of metasedimentary rock suites from the Southern Granulite Terrane, India

By
Pulak Sengupta
Pulak Sengupta
Department of Geological Sciences, Jadavpur University, Kolkata-700032, India
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Michael M. Raith
Michael M. Raith
Steinmann Institut, Universität Bonn, Poppelsdorfer Schloss, 53115 Bonn, Germany
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Ellen Kooijman
Ellen Kooijman
Institut für Mineralogie, Universität Münster, Corrensstrasse 24, 48145 Münster, GermanyDepartment of Geosciences, Swedish Museum of Natural History, Box 50 007, SE-104 05 Stockholm, Sweden
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Moumita Talukdar
Moumita Talukdar
Department of Geological Sciences, Jadavpur University, Kolkata-700032, India
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Priyadarshi Chowdhury
Priyadarshi Chowdhury
Department of Geological Sciences, Jadavpur University, Kolkata-700032, India
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Sanjoy Sanyal
Sanjoy Sanyal
Department of Geological Sciences, Jadavpur University, Kolkata-700032, India
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Klaus Mezger
Klaus Mezger
Institut für Geologie, Universität Bern, Baltzerstrasse 1+3, 3012 Bern, Switzerland
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Dhruba Mukhopadhyay
Dhruba Mukhopadhyay
Raman Centre for Applied and Interdisciplinary Sciences, 16A Jheel Road, Kolkata 700075, India
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Published:
January 01, 2015

Abstract

The Southern Granulite Terrane of India exposes remnants of an interbanded sequence of orthoquartzite–metapelite–calcareous rocks across the enigmatic Palghat–Cauvery Shear Zone (PCSZ), which has been interpreted as a Pan-African terrane boundary representing the eastward extension of the Betsimisaraka Suture Zone of Madagascar. Zircon U–Pb geochronology of metasedimentary rocks from both sides of the PCSZ shows that the precursor sediments of these rocks were sourced from the Dharwar Craton and the adjoining parts of the Indian shield. The similarity of the provenance and the vestiges of Grenvillian-age orogenesis in some metasedimentary rocks contradict an interpretation that the PCSZ is a Pan-African terrane boundary. The lithological association and the likely basin formation age of the metasedimentary rocks of the Southern Granulite Terrane show remarkable similarity to the rock assemblage and timing of sedimentation of the Palaeoproterozoic to Neoproterozoic shallow-marine deposits of the Purana basins lying several hundred kilometres north of this terrane. Integrating the existing geological information, it is postulated that the shallow-marine sediments were deposited on a unified land-mass consisting of a large part of Madagascar and the Indian shield that existed before Neoproterozoic time, part of which was later involved in the Pan-African orogeny.

Supplementary material:

Details of the zircon U–Pb LA-MC-ICP-MS analyses of samples are available at http://www.geolsoc.org.uk/SUP18793.

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Contents

Geological Society, London, Memoirs

Precambrian Basins of India: Stratigraphic and Tectonic Context

R. Mazumder
R. Mazumder
University of New South Wales, Australia
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P. G. Eriksson
P. G. Eriksson
University of Pretoria, South Africa
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Geological Society of London
Volume
43
ISBN electronic:
9781862397194
Publication date:
January 01, 2015

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