Grenvillian thermal event and remnant charnockite: Isotopic evidence from the Chilka Lake granulite-migmatite suite in the Eastern Ghats belt, India |
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| Authors: | S Bhattacharya M P Deomurari W Teixeira |
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| Institution: | (1) Indian Statistical Institute, 203 B.T. Road, 700 035 Calcutta, India;(2) Physical Research Laboratory, Ahmedabad, India;(3) Institute of Geosciences, Sao Paulo University, Brazil |
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| Abstract: | Spectacular exposures of granulite-migmatite occur in the Chilka Lake area of the Eastern Ghats belt. The garnetiferous granite
gneiss of peraluminous granitic composition, often contains restitic metapelite inclusions and is demonstrably a product of
biotite-dehydration melting in pelitic rocks. On the other hand, older layers and bands of charnockitic rocks frequently occur
as dismembered patches within the peraluminous granite, thus imparting a measled appearance of the granite exposures.
The partial melting and emplacement of the peraluminous granite represent the Grenvillian thermal event, as evidenced by Rb-Sr
whole rock and Pb-Pb zircon dating. On the other hand, minor patches of charnockite represent migmatized relict, as evidenced
by some older zircons, in addition to those of Grenvillian age. |
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| Keywords: | Granite-migmatite Grenvillian event zircon population remnant charnockite |
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