Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Kent C. Condie ¹, F. J. Longstaffe ²

Affiliations
1 Department of Geoscience, New Mexico Institute of Mining and Technology Socorro, N.M. 87801, US
2 Department of Geology. University of Western Ontario, London, Ontario N6A 5B7, CA

Abstract

The oxygen isotopic composition of Archean orthogneisses and charnockites from Southern India is rather uniform (δ¹⁸O generally 6-8%) for metamorphic grades ranging from amphibolite to high-P granulite. Some high-P granulites have high δ¹⁸O~ 10%) suggesting sediment contributions. CO₂ metamorphism does not appear to have affected the δ¹⁸O values of Indian charnockites.

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