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Further data on an ‘eclogite’ from the Sittampundi Complex, India

Published online by Cambridge University Press:  05 July 2018

B. W. Chappell  and
A. J. R. White
B. W. Chappell
Affiliation:
Department of Geology, Australian National University, Canberra, Australia
A. J. R. White
Affiliation:
Department of Geology, Australian National University, Canberra, Australia
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Summary

New analyses of a garnet-clinopyroxene rock (‘eclogite’) and its constituent minerals from the Sittampundi complex of India are presented. The rock has a composition comparable with an alkali-poor tholeiite and this composition, as well as the garnet (Py 51·5 %; Alm 32·7 %) and pyroxene (Jd 7·4 %; Ts 10·8 %) are very similar to those from South Harris.

The apparent distribution coefficient (K′Fe/Mg) for the garnet-clinopyroxene pair suggests a temperature of equilibration near 850 °C. Projection of the experimental data of Green and Ringwood (1967) down to this temperature suggests a pressure of about 7–8 kb. This is well below the pressure of the granulite-eclogite transition.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 289 , March 1970 , pp. 555 - 560
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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