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Authors
Affiliations
1 Department of Geology, Manasagangotri, University of Mysore, Mysore, 570007, IN
2 Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706, US
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 40, No 4 (1992), Pagination: 341-346
Abstract
Oxygen and carbon isotopic compositions for carbonate rocks from the Sargur Group in Kamataka and carbonates from the Madukkarai area in Tamil Nadu are reported. Carbonate rocks from both areas show preservation of sedimentary isotopic compositions. Bettadabidu carbonates have lower isotopic ratios (δ180 = 15.8 SMOW ; δ13C = ·0.7 PDB) when compared to Madukkarai carbonates (δ 180 = 20 SMOW; δ 13C = 2.0 POB). Oxygen and carbon isotopic values exhibit positive correlation indicating a progressive devolatilization process during regional metamorphism. The range in δ180 values demonstrates that large quantities of a homogeneous metamorphic fluid have not pervasively infiltrated either terrane.
Keywords
Precambrian Carbonates, Oxygen and Carbon Isotopes, Kamataka, Tamil Nadu.
