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Book Chapter

Sedimentation in the Papaghni Group of rocks in the Papaghni sub-basin of the Proterozoic Cuddapah Basin, India

By
G. Chakrabarti
G. Chakrabarti
Department of Geology, Durgapur Government College, West Bengal, IndiaEducation Directorate, Government of West Bengal, India
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P. G. Eriksson
P. G. Eriksson
Department of Geology, University of Pretoria, Pretoria 0002, South Africa
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D. Shome
D. Shome
Department of Geological Sciences, Jadavpur University, Kolkata 700032, India
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Published:
January 01, 2015

Abstract

The Gulcheru Quartzite (30–200 m thick) overlies Archaean basement rocks, and comprises an impersistent conglomerate at the base of more widespread quartzites, with shale and ferruginous interbeds. The overlying Vempalle Formation (≤1500 m) comprises mainly stromatolitic carbonates, lesser cherts and mudrocks. Together, these two units make up the Palaeoproterozoic Papaghni Group, which displays an arcuate outcrop belt in the SW Cuddapah Basin, bearing no obvious relationship to the tectonic grain in the basement lithologies. Facies defined in the Gulcheru Quartzite are ascribed to initial alluvial fans, which transitioned into a shallow-marine coastline and shelf, as transgression occurred under overall thermal subsidence, possibly related to post-plume thermal relaxation. The shallow siliciclastic Gulcheru shelf is inferred to have evolved to a stromatolitic ramp that accommodated deposition of the Vempalle chemical sediments. The abrupt vertical transition from clastic to carbonate deposits is ascribed to rapid sea-level rise. Late-stage shoreline progradation during uppermost Vempalle times and concomitant clastic inflows terminated the carbonate factory.

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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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