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Petrology, geothermobarometry and C-O-H-S fluid compositions in the environs of Rampura-Agucha Zn-(Pb) ore deposit, Bhilwara District, Rajasthan

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Abstract

The massive Zn-(Pb) sulfide ore body at Rampura-Agucha in Bhilwara district, Rajasthan, occurs within graphitic metapelites surrounded by garnet-biotite-sillimanite gneiss containing concordant bodies of amphibolite. These rocks and the sulfide ores have been studied to estimate the pressure, temperature and fluid composition associated with upper amphibolite facies metamorphism. Geothermobarometric calculations involving garnet-biotite and garnet-hornblende pairs, as well as sphalerite-hexagonal pyrrhotite-pyrite and garnet-plagioclase-sillimanite-quartz assemblages indicate that the most pervasive P-T condition during peak of regional metamorphism was 650°C and 6 kb, and was attained between the first and second deformations in the region. Some temperature-pressure estimates also cluster around 500°C–5.1 kb which probably represent retrograde cooling during unloading.

Consideration of devolatilization equilibria in the C-O-H-S system at the pervasive metamorphic conditions mentioned above shows that the metamorphic fluid was H2O-rich (\(X_{H_2 O} = 0.52\)) but also had a substantial component of\(CO_2 (X_{CO_2 } = 0.39)\).\(H_2 S(X_{H_2 S} = 0.043)\) and\(CH_4 (X_{CH_4 } = 0.025)\) were the other important phases in the fluid. CO (XCO = 0.002) and\(H_2 (X_{H_2 } = 0.002)\) were the minor phases in the fluid. It is probable that a part of this aqueous fluid was consumed by re-/neocrystallization of hydrous silicate phases like chlorite during the retrogressive metamorphic path, so that fluid entrapped in quartz below 450°C was rendered CO2-rich (Holleret al 1996).

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  1. Uma Sehgal

    Present address: Central Ground Water Board, Man Singh Road, 110011, New Delhi, India

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  1. Department of Geology, Delhi University, 110 007, Delhi, India

    M. Deb & Uma Sehgal

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Deb, M., Sehgal, U. Petrology, geothermobarometry and C-O-H-S fluid compositions in the environs of Rampura-Agucha Zn-(Pb) ore deposit, Bhilwara District, Rajasthan. Proc. Indian Acad. Sci. (Earth Planet Sci.) 106, 343–356 (1997). https://doi.org/10.1007/BF02843458

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