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

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S-Isotopic Study On Baryte From the Andiyappanur Area, North Arcot District, Tamil Nadu


Affiliations
1 Atomic Minerals Division, Department of Atomic Energy, Bangalore - 560 072, India
2 Atomic Minerals Division, Department of Atomic Energy, Nagpur - 440 001, India
3 Atomic Minerals Division, Department of Atomic Energy, Bangalore - 560 072, India
4 Atomic Minerals Division, Department of Atomic Energy, Hyderabad - 500 016, India
     

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Sulphur-isotopic dataon fifteen samples of baryte from the quartz-baryte rock occurring along a shear zone east of the Elagiri Syenite pluton at Andiyappanur, Tamil Nadu have shown a narrow range of +5.1‰ to +9.5‰, with an average of +6.70‰, for δ34SCDT. The data, in conjunction with the field and petromineralogical characteristics, indicate hydrothermal-type mineralisation of baryte. Association of relatively earlier formed sulphides like pyrite, molybdenite and galena, and later formed sulphates like baryte and jarosite in this quartz-baryte rock is attributed to dual behaviour of sulphur in the magmatichydrothermal system, with formation of sulphides at depth under reducing conditions and of sulphates in the shallower oxidised zones.

Keywords

Baryte, Geochemistry, Andiyappanur, Tamil Nadu.
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  • S-Isotopic Study On Baryte From the Andiyappanur Area, North Arcot District, Tamil Nadu

Abstract Views: 199  |  PDF Views: 3

Authors

Mary K. Kumar
Atomic Minerals Division, Department of Atomic Energy, Bangalore - 560 072, India
D. Veera Baskar
Atomic Minerals Division, Department of Atomic Energy, Nagpur - 440 001, India
Mithilesh Sharma
Atomic Minerals Division, Department of Atomic Energy, Bangalore - 560 072, India
T. Chabria
Atomic Minerals Division, Department of Atomic Energy, Hyderabad - 500 016, India
R. Dhanar Raju
Atomic Minerals Division, Department of Atomic Energy, Bangalore - 560 072, India

Abstract


Sulphur-isotopic dataon fifteen samples of baryte from the quartz-baryte rock occurring along a shear zone east of the Elagiri Syenite pluton at Andiyappanur, Tamil Nadu have shown a narrow range of +5.1‰ to +9.5‰, with an average of +6.70‰, for δ34SCDT. The data, in conjunction with the field and petromineralogical characteristics, indicate hydrothermal-type mineralisation of baryte. Association of relatively earlier formed sulphides like pyrite, molybdenite and galena, and later formed sulphates like baryte and jarosite in this quartz-baryte rock is attributed to dual behaviour of sulphur in the magmatichydrothermal system, with formation of sulphides at depth under reducing conditions and of sulphates in the shallower oxidised zones.

Keywords


Baryte, Geochemistry, Andiyappanur, Tamil Nadu.