Tourmaline as metallogenic indicator: Examples from paleo-proterozoic Pb-Zn and Cu-Au deposits of Rajasthan |
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Authors: | Fareeduddin Susmita Gupta P R Golani I R Kirmani Suresh Chander Geological Survey of India |
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Affiliation: | 1.PPOD Division, RSAS Wing, Kumaraswamy Layout,Bangalore,India;2.Training Institute,Jaipur,India;3.Operations Rajasthan,Jaipur,India;4.WZ, RSAS,Jaipur,India |
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Abstract: | Petrology and mineral chemistry of ten types of tourmalines from Pb-Zn bearing strata-bound exhalative deposits and Cu-Au-Fe
deposits, presumably of IOCG-type, from Rajasthan are presented. The Pb-Zn deposits studied include Agucha, Kayar and Dariba
areas in central Rajasthan, each of which is widely separated in space and occurs in isolated but coeval basins within the
Archaean basement. The Cu-Au deposits include Ghagri, Bada Talav, Dugocha and Bhukia areas in southeast Rajasthan. The syngenetic
Pb-Zn type and the epigenetic Cu-Au-Fe type of deposits are formed during the initial phase of Paleoproterozoic Aravalli Basin
evolution with dominant deposition of shelf facies pelite-carbonate sequence of Debari Group. The post-depositional tectono-metamorphic
history of the host rocks of Pb-Zn type and Cu-Au type deposits differ significantly with the former deposits showing higher
metamorphic impress (amphibolite to lower granulite facies) than the latter (green schist facies). |
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