Author:
Chappell B. W.,White A. J. R.
Abstract
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.
Subject
Geochemistry and Petrology
Cited by
23 articles.
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