Further Data on an ‘Eclogite’ from the Sittampundi Complex, India

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

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.

Mineralogical Magazine; March 1970 v. 37; no. 289; p. 555-560; DOI: 10.1180/minmag.1970.037.289.04
© 1970, The Mineralogical Society
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