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The paragenesis of garnet in charnockite, enderbite, and related granulites

Published online by Cambridge University Press:  14 March 2018

R. A. Howie  and
A. P. Subramaniam
R. A. Howie
Affiliation:
Geology Dept., University of Manchester
A. P. Subramaniam
Affiliation:
Geological Survey of India
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Summary

The presence of garnet in acid rocks of the charnockite series south of Madras is reported. Petrographic deseriptions of garnetiferous enderbites and related pyroxene-granulites, khondalites, and leptynites are accompanied by new chemical analyses of 6 rocks, 8 garnets, and 5 orthopyroxenes from the type area near Madras, and from Ceylon, Varberg, and Uganda. The garnets show a considerably higher FeO/MgO ratio than the coexisting ortbopyroxenes and the host rocks. The presence or absence of garnet appears to be related to the bulk chemistry of the rocks. Basic garnetiferous granulites associated with these rocks are considered to represent an unstable mineral assemblage and may be genetically unrelated to the acid types. Attention is drawn to the prevalence of enderbitic rocks in the type area.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 238 , September 1957 , pp. 565 - 586
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1957

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