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Trace element geochemistry of parts of the Closepet granite, Mysore State, India1

Published online by Cambridge University Press:  05 July 2018

V. Divakara Rao ,
U. Aswathanarayana  and
M. N. Qureshy
V. Divakara Rao
Affiliation:
National Geophysical Research Institute, Hyderabad-7, A.P., India
U. Aswathanarayana
Affiliation:
Centre of Advanced Study in Geology, University of Saugar, Sagar, M.P., India
M. N. Qureshy
Affiliation:
National Geophysical Research Institute, Hyderabad-7, A.P., India
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Summary

Trace elements in twenty samples of the Closepet granite (grey and pink varieties) and the related rocks have been determined by neutron activation analysis (Th, Rb, and Cs), fluorometry (U), flame-photometry (K), and emission spectroscopy (Pb, Sr). The trace element contents of the grey and pink varieties are generally similar. An analysis of the magnitudes of the trace element and other ratios (K/Rb, 235; Th/U, 6·4; U/K (× 104), 0·7; K/Cs (× 10−4), 3·6; Th/K (× 104), 5·3; Fe2O3/(FeO+Fe2O3), 0·27) as well as 87Sr/86Sr initial ratio (0·705; Crawford, 1969) of the Closepet granite indicate two possible modes of genesis: Either the granite magma was not highly differentiated and the vapour phase was relatively insignificant; the crystallization of the magma took place under essentially non-oxidizing conditions; the pink variety, which followed the grey variety, crystallized under essentially the same conditions as the grey variety. Or the Closepet granite had a two-stage history—palingenesis (starting from the Peninsular gneiss) and metasomatism involving the enrichment in K, Rb, Pb, and Th and depletion of Sr and Cs, among others.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 298 , June 1972 , pp. 678 - 686
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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Footnotes

1

Contribution to the Indian National Programme of the International Upper Mantle Project.

2

Work reported in this communication forms part of the Ph.D. thesis of the author.

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