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Arima, M.
- Oxygen Isotope Values in Granulite Facies Rocks from the Eastern Ghats Granulite Belt, India
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Authors
Affiliations
1 Department of Geology, Andhra University, Visakhapatnam- 530 003, IN
2 National Geophysical Research Institute, Hyderabad - 500 007, IN
3 Department of Geosciences, Osaka City University, Osaka - 558, JP
4 Department of Geological Science, Yokhoma National University, Yokahoma, JP
1 Department of Geology, Andhra University, Visakhapatnam- 530 003, IN
2 National Geophysical Research Institute, Hyderabad - 500 007, IN
3 Department of Geosciences, Osaka City University, Osaka - 558, JP
4 Department of Geological Science, Yokhoma National University, Yokahoma, JP
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 4 (2000), Pagination: 445-452Abstract
Oxygen isotope values in metapelites including garnet-sillimanite gneisses (khondalites), quartzo-feldspathic gneisses (leptynites), cordierite-sapphirine gneisses and the associated marbles, calc-silicates, quartzites, basic granulites and charnockites from the Eastern Ghats Granulite Belt are presented and their significance discussed. Metapefites show a wide variation in δ18O values (4.50 to 13.90‰) that is controlled largely by the mineralogy of the rocks. Coarse grained porphyritic charnockites have higher δ18O values (8.60-11.20‰) than that of medium grained ones (5.90-6.60‰) Basic granulites have the minimum δ18O values (∼5.0‰). Oxygen isotope values of different rock units in the granulite belt are constrained mostly by the composition of the source rocks of the sediments and of the protoliths in the case of charnockites. Post-depositional metamorphic and metasomatic fluids had little contribution to the δ18O variations in these rocks.Keywords
O-Isotopes, Eastern Ghats Granulite Belt, Khondalites, Charnockites, Andhra Pradesh.- Whole Rock and Mineral Chemistry of Aluminous Granulites From the Eastern Ghats Granulite Belt, Andhra Pradesh
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PDF Views:2
Authors
Affiliations
1 Department of Geology, Andhra University, Visakhapatnam-530 003, IN
2 National Geophysical Research Institute, Hyderabad- 500 007, IN
3 Department of Geosciences, Osaka City University, Osaka 558, JP
4 Department of Geological Sciences, Yokohama National University, Yokohama, JP
1 Department of Geology, Andhra University, Visakhapatnam-530 003, IN
2 National Geophysical Research Institute, Hyderabad- 500 007, IN
3 Department of Geosciences, Osaka City University, Osaka 558, JP
4 Department of Geological Sciences, Yokohama National University, Yokohama, JP
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 5 (1997), Pagination: 559-570Abstract
The whole rock analyses confirm the basic to intermediate nature of the protolith (SiO2, > 53% - < 67%) with high alumina (highest 22.18%) and high K2O (∼ 4%). Metamorphic segregation as well as source rock compositions appear to have contributed -to the formation of high alumina granulites. The temperatures of metamorphism estimated using garnet - hypersthene/cordierite pairs range from 680-980°C, The gamet-cordierite reference temperatures with narrow range 700-750°C, indicate a pressure range of 5-7 kbar for the garnet-orthopyroxene-plagioclase-quartz assemblage in the aluminous granulites. Textural relationships of cordierite breakdown and reappearance of cordierite supplement the two generations of cordierite from aluminous granulites in the Eastern Ghats Granulites Belt.Keywords
Geochemistry, Aluminous Granulites, P-T Estimates, Eastern Ghats Granulite Belt (EGGB), Andhra Pradesh.- Colour-coded Compositional Mapping of Orthopyroxene-Plagioclase -: Symplectites in Mafic Granulites from Panrimalai, South India
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Authors
Affiliations
1 Departmeont of Geology, Banaras Hindu University, Varanasi-221005, IN
2 Geological Institute Yokohama National university, 79-7 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, JP
1 Departmeont of Geology, Banaras Hindu University, Varanasi-221005, IN
2 Geological Institute Yokohama National university, 79-7 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, JP