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Original nature and source of khondalites in the Eastern Ghats Province, India

By
S. Bhattacharya
S. Bhattacharya
1
Geological Studies Unit, Indian Statistical Institute, Kolkata 700108, India
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A. K. Chaudhary
A. K. Chaudhary
2
Indian Institute of Technology, Roorkee 247667, India
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M. Basei
M. Basei
3
Institute of Geosciences,São Paulo University, São Paulo 05508-080,Brazil
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Published:
January 01, 2012

Abstract

The khondalites of the Eastern Ghats Province, India represent a sedimentary sequence of shale–greywacke, but the relatively more ferruginous composition can be attributed to some mafic rocks in the provenance. While a high La/Sc ratio and an insignificant Cr-enrichment over V in the majority of samples indicate dominantly granitic source rocks; a low La/Sc ratio and high Cr/V ratio in some samples indicate some mafic source rocks as well. High La/Sc ratio, LREE (light rare earth element)-enrichment, negative Eu anomaly and negative ɛ values, along with evidence of significant weathering and recycling in the provenance, indicate Old Upper Continental Crust-type provenance. Nd-model dates indicate Palaeoproterozoic provenance, which could be the Eastern Dharwar Craton and/or the Napier Complex of East Antarctica. (La/Yb)N ratios are variable and their co-variance with both (La/Sm)N and (Gd/Yb)N are noticeable, and could be attributed to the complexity of possible provenance composition.

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Contents

Geological Society, London, Special Publications

Palaeoproterozoic of India

R. Mazumder
R. Mazumder
Geological Studies Unit, Indian Statistical Institute, Kolkata, India
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D. Saha
D. Saha
Geological Studies Unit, Indian Statistical Institute, Kolkata, India
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Geological Society of London
Volume
365
ISBN electronic:
9781862396135
Publication date:
January 01, 2012

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