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Occurrence of kornerupine-bearing granulite from Kunjan locality, Salem district, Tamil Nadu, India


Affiliations
1 Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, India
2 Department of Earth Sciences, Annamalai University, Annamalai Nagar 608 002, India
3 Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, India
 

Kornerupine, although a rare mineral, has been reported from several locations around the world in various types of aluminomagnesian Proterozoic rocks subjected to amphibolite and granulite facies metamorphism. Here we report the occurrence of kornerupine in quartzo-feldspathic gneisses near Kunjan town located in the southwestern part of Salem district, Tamil Nadu, India. These kornerupine granulites show well-preserved retrogression texture, involving hydration reactions which helped develop the various mineral assemblages. The common stable assemblage in these granulites is orthopyroxene–cordierite–kornerupine–biotite–spinel–K-feldspar–plagioclase. The P–T conditions of these granulites have been derived using the winTWQ program, which gives results of ~800°C and ~6 kbar for kornerupine-bearing assemblage. The high P–T assemblage reported from this area bears a significant relationship with the metamorphic history and exhumation of the Salem–Namakkal block

Keywords

Hydration reactions, kornerupine granulites, metamorphic evolution, mineral assemblages, retrogression texture.
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  • Occurrence of kornerupine-bearing granulite from Kunjan locality, Salem district, Tamil Nadu, India

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Authors

D. Prakash
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, India
C. K. Singh
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, India
R. S. Kumar
Department of Earth Sciences, Annamalai University, Annamalai Nagar 608 002, India
R. Yadav
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, India
S. K. Rai
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, India
M. K. Yadav
Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, India
Pradip K. Singh
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, India
S. Jaiswal
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, India

Abstract


Kornerupine, although a rare mineral, has been reported from several locations around the world in various types of aluminomagnesian Proterozoic rocks subjected to amphibolite and granulite facies metamorphism. Here we report the occurrence of kornerupine in quartzo-feldspathic gneisses near Kunjan town located in the southwestern part of Salem district, Tamil Nadu, India. These kornerupine granulites show well-preserved retrogression texture, involving hydration reactions which helped develop the various mineral assemblages. The common stable assemblage in these granulites is orthopyroxene–cordierite–kornerupine–biotite–spinel–K-feldspar–plagioclase. The P–T conditions of these granulites have been derived using the winTWQ program, which gives results of ~800°C and ~6 kbar for kornerupine-bearing assemblage. The high P–T assemblage reported from this area bears a significant relationship with the metamorphic history and exhumation of the Salem–Namakkal block

Keywords


Hydration reactions, kornerupine granulites, metamorphic evolution, mineral assemblages, retrogression texture.

References





DOI: https://doi.org/10.18520/cs%2Fv121%2Fi9%2F1241-1248