EASTERN GHATS GRANULITE TERRAIN OF INDIA - AN OVERVIEW

The Eastern Ghats on the east coast of India is a largely granulite te rrain but also exposes granites, migmatites, anorthosites and alkaline rocks. This granulite belt has had a prolonged history of mountain bu ilding from late Archaean to late Proterozoic. During this long period the Eastern Ghats mobile belt witnessed repeated folding and possibly polycyclic metamorphism. Some recent findings suggest breaks between orogenic cycles and a proterozoic reworking of Archaean granulites. Ex treme-temperature crustal metamorphism under fluid-absent conditions a nd crustal anatexis in huge thickness of pelitic to psammitic protolit hs producing leptynites are some of the important results of recent in vestigations of the Eastern Ghats mobile belt. Different generation of charnockites are present in the Eastern Ghats belt, but charnockitisa tion of granitic gneisses is yet to be documented. Some apparently nas cent growths, the patchy charnockites in the Chilka area are shown to be relict of older charnockitic rocks that suffered granulite-facies m etamorphism and attendant migmatisation. Copyright (C) 1996 Elsevier S cience Ltd