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The geochemistry of 'charnockites' and their constituent ferromagnesian minerals from the Precambrian of south-east Sri Lanka (Ceylon)

Published online by Cambridge University Press:  05 July 2018

D. E. De S. Jayawardena  and
D. A. Carswell
D. E. De S. Jayawardena
Affiliation:
Department of Geology, University of Sheffield, Sheffield, S1 3JD
D. A. Carswell
Affiliation:
Department of Geology, University of Sheffield, Sheffield, S1 3JD
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Summary

A chemical and petrographic study of charnockites and pyroxene/hornblende-bearing granulites has been undertaken, and the data used in an interpretation of the petrogenesis of these rocks. Major- and trace-element analyses of fourteen rocks are presented, together with majorelement analyses of seven orthopyroxenes, seven clinopyroxenes, two garnets, and three hornblendes. The compositions of the coexisting ferromagnesian minerals are used to obtain estimates of the likely pressure/temperature conditions of equilibration (5-7 kbar and 700±50°C of the various mineral assemblages.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 314 , June 1976 , pp. 541 - 554
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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Footnotes

1

Present address: Geological Survey Department, 48 Sri Jinaratana Road, Colombo—2, Sri Lanka.

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