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Unravelling the depositional environment of the Archaean Rajkharsawan conglomerate (Jharkhand, eastern India)

Published online by Cambridge University Press:  24 March 2014

A.J. van Loon ,
R. Mazumder  and
S. De
A.J. van Loon*
Affiliation:
Geological Institute, Adam Mickiewicz University, Maków Polnych 16, 61-606 Poznań, Poland
R. Mazumder
Affiliation:
School of Biology, Earth and Environmental Sciences, University of New South Wales, Sydney 2052, Australia Geological Studies Unit, Indian Statistical Institute, 203 B.T. Road, Kolkata 700-108, India
S. De
Affiliation:
Geological Studies Unit, Indian Statistical Institute, 203 B.T. Road, Kolkata 700-108, India
*
Email: tvanloon@amu.edu.pl.

Abstract

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Large conglomerate lenses occur in a fine-grained siliciclastic succession of the Singhbhum craton, eastern India. They overlie an Archaean orthogneiss, from which they are separated by a palaeosol. Neither the conglomerates nor the directly overlying rocks have been dated, but the conglomerate unit is assumed to have also an Archaean age. The conglomerate lenses occur within a succession of pelitic and mafic schists, and the depositional environment of this conglomerate/schist unit had not been clarified thus far. On the basis of a combination of the vertical and horizontal distribution of the conglomerates, their stratigraphic position and analysis of their sedimentological characteristics and the sedimentological context, it is concluded that the succession must have developed in a fluvial lowland environment where volcanic input contributed significantly to the sediment accumulation.

Keywords

Rajkharsawan conglomerateeastern IndiaArchaeanfluvial environmentSinghbhum craton

Information

Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 91 , Issue 1-2 , September 2012 , pp. 129 - 135
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2012

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