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Geochemistry and strontium isotopic composition of basalts from the Eastern Deccan volcanic province, India

Published online by Cambridge University Press:  05 July 2018

P. Oliver Alexander  and
Dalim K. Paul
P. Oliver Alexander
Affiliation:
Department of Earth Sciences, The University, Leeds, England
Dalim K. Paul
Affiliation:
Department of Earth Sciences, The University, Leeds, England
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Summary

Ten rather uniform tholeiitic basalt flows totalling a thickness of 190 m from Sagar, India, contain two stratigraphical breaks. Major element variation allows the flows to be grouped into two eruption cycles. Due to intraflow variation, however, chemical composition is unlikely to be useful in widespread correlation of flow sequence. The initial 87Sr/86Sr ratios vary from 0·7039 to 0·7084 with Rb and Sr averaging 6·5 and 184 ppm respectively and Rb/Sr ratios ranging from 0·002 to 0·224, with no systematic relationship between the initial 87Sr/86Sr ratios and other chemical parameters. Bulk crustal contamination is considered unlikely; selective introduction of 87Sr from the granitic basement is postulated.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 318 , June 1977 , pp. 165 - 171
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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Footnotes

1

Now at: Department of Geology, McMaster University, Hamilton, Ontario, Canada.

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