AN EXOTIC TERRANE AT THE WESTERN MARGIN OF THE EASTERN GHATS BELT, INDIA

S. Bhattacharya, Rajib Kar, W. Teixeira, M. Basei

Abstract


The Eastern Ghats granulite belt along the east coast of Peninsular India has a polyphase deformation and complex metamorphic record. Moreover, geochronological record indicated two distinct crustal domains, namely, Eastern Ghats Province and Ongole domain, separated by the Godavari graben. The most predominant granulite facies event in the Eastern Ghats Province is of Grenvillian age, as recorded from different lithologies and different segments of this large granulite terrane. Around Jeypore, at the western margin of the Eastern Ghats Province, the dominant lithology is massif-type charnockite with abundant mafic enclaves and xenoliths. A crustal scale shear zone at the western margin affected both the charnockitic assemblage and the cratonic assemblages. U-Pb dating of zircons from charnockite and cratonic assemblages indicates a strong thermal imprint around 2.5 Ga. Most importantly, no Grenvillian imprint is recorded in any of these assemblages, and this implies an exotic terrane later incorporated into the Eastern Ghats Province, possibly during the Grenvillian orogeny.


Keywords


Exotic terrane; Shear zone; Cratonic margin; Eastern Ghats Province

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