A new sapphirine occurrence from Kambam valley, Tamil Nadu and its possible relation to the Pan-African tectonothermal event

Anto, K. F. and Janardhan, A. S. and Sivasubramanian, P. (1997) A new sapphirine occurrence from Kambam valley, Tamil Nadu and its possible relation to the Pan-African tectonothermal event. Current Science, 73 (9). pp. 792-796.

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Abstract

Petrography and metamorphic conditions of a new sapphirine-bearing assemblage from Kambam valley are described, Temperature of formation of sapphirine-bearing assemblages is high, around 850 degrees C, and pressures range from 7.5 to 5 kbars, suggesting that sapphirine formation took place during decompression events. The sapphirine occurrence of the Kambam valley is the southern most, reported so far in the southern granulite terrain (SGT). Here we report the sapphirine occurrences of the eastern Kodaikanal ranges cluster around the Kambam fault, which hosts carbonatite. In addition, numerous syenite bodies and alkaline granites are common to the Kodaikanal ranges, The age of garnet separates (Sm-Nd garnet/whole rock) of Kambam valley and Kodaikanal ranges is around 550 to 520 Ma. This indirectly gives the age of sapphirine formation, as sapphirine develops after garnet. The age of the carbonatite, syenite bodies and alkali granites which occur along these intra-cratonic lineaments ranges between 790 and 550 Ma. The close spatial association of the high temperature sapphirine-bearing assemblages with the Kambam fault strongly suggest that their formation is closely linked to Pan-African tectonothermal event.

Item Type: Article
Subjects: F Earth Science > Geology
Divisions: Department of > Earth Science
Depositing User: Users 23 not found.
Date Deposited: 05 Jun 2021 05:26
Last Modified: 31 May 2022 10:13
URI: http://eprints.uni-mysore.ac.in/id/eprint/16590

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