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

P. Sivasubramanian ¹, R. Natarajan ², A. S. Janardhan ¹

Affiliations
1 Department of Geology, University of Mysore, Mysore 570006, IN
2 National Geophysical Research Institute, Hyderabad 500007, IN

Abstract

A new find of sapphirine-bearing granulite rocks from Perumalmalai area, 15 km from Kodaikanal is reported. These rocks, contain in addition to sapphirine, cordierite-garnet-orthopyroxene-spinel-biotite-plagioclase. Among the pairs, garnetcordierite gives pressure of 8.5 kb at temperature of 550°C; garnet-orthopyroxene gives 6 kb at 800°C and cordierite-garnet-sapphirine gives 7.2 kb at 700°C. The sapphirineforming reaction probably took place after the main charnockite event. Evidences of decompression of garnet breaking down to orthopyroxene-spinel-plagioclase-biotite at rather high temperatures indicates rapid uplift.

Keywords

Sapphirine, Perumalmalai, Palani Hills, Tamil Nadu, Geobarometry, Granulites.

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G. Manimaran ¹, P. Sivasubramanian ¹, M. Senthiappan ²

Affiliations
1 Department of Geology, V.O. Chidambaram College, Tuticorin - 628 008, IN
2 Geological Survey of India, Mangalore - 575 003, IN

Abstract

No Abstract.

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