Metastable corundum + quartz + andalusite association in pelitic granulite from the Kerala Khondalite Belt, southern India

概要

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Corundum in direct contact with quartz and associated with andalusite has been found as an inclusion in alkali feldspar obtained from a leucosome, which forms a part of migmatized pelitic granulite from the Kerala Khondalite Belt, southern India. Thermodynamically, corundum + quartz is metastable relative to andalusite. Textural features suggest that it is a rare example of an arrested reaction corundum + quartz → andalusite which may have been triggered off by the introduction of H2O-rich fluids along the cracks of the host alkali feldspar during the uplift and cooling of the leucosome. The metastable corundum + quartz association most likely originated during the crystallization of the Al2O3-rich leucosome melt when early corundum came into contact with later quartz under conditions with a relatively low H2O activity.
2011-08-01