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- W4245490768 abstract "The isotopic compositions of sulfur in 220 sulfide-mineral separates from 14 conformable Zn-Pb-Cu, Zn-Pb and Cu sulfide-ore deposits/prospects in the Proterozoic Aravalli-Delhi orogenic belt in NW India, are presented. The deposits occur in successive linear belts - Bhilwara, Aravalli and Delhi (from east to west), and are conformable, sediment-hosted and isofacially metamorphosed with their host rocks.Within the Bhilwara belt, the mean δ34S is 9.1°/00 in sphalerites from Rampura-Agucha, while in the zoned Dariba deposit δ34S increases stratigraphically upwards from 1.8°/00 in the footwall Cu zone through 2.3°/00 in the Pb-Zn (Ag-As) zone to 7.7°/00 in the hanging-wall Fe zone. The northward extension of this pyrite-pyrrhotite zone at Sindeswar Kalan has a mean value of 2.5°/00. The ore zone in the Zawar field, within the Aravalli belt, shows sharp variations from an average of 2.2°/00 at Balaria to 6.2°/00 at Mochia Magra and from 0.50/00 at Baroi Magra to 10.9°/00 at Zawar Mala. In the southern half of the Delhi belt, Ambaji-Deri ores have the heaviest sulfur compositions with an average δ34 S of 18.4°/00, while Basantgarh ores have an average of 7.2°/00. In the northern half, along the Khetri Cu belt, there is continuous depletion of 34S southwards: the average δ34 S is 11°/00 at Madan Kudan, through 9.4°/00 at Kolihan to 8°/00 at Chandmari. 50 Km further south at Saladipura the average is 46°/00.Sulfur-isotope geothermometry indicates that small-scale (in mm) equilibration/re-equilibration has occurred during metamorphism but primary isotopic variations (in mm-scale) have remained by and large undisturbed. Temperature estimates in the range 64°C-383°C probably represent primary equilibration in the exhalative fluids during ore generation. Small and restricted Δ34S sw-Sulf values between-2.1 and 17.5°/00 in all but one deposit suggest that the ores incorporated mainly reduced sulfur of hydrothermal, rather than bacteriogenic origin. Contribution from basaltic sulfides to the inorganically reduced seawater sulfate is envisaged for Rampura-Agucha, Rajpura-Dariba and Basantgarh ores, while a bacteriogenic sulfur contribution is apparent in the hanging-wall part of the Dariba deposit and its northward extension at Sindeswar Kalan, in the Zawar ore field, the southern part of the Khetri belt, and particularly at Saladipura. The heaviest sulfur at Ambaji-Deri, with δ34S > contemporary seawater sulfate, can be best explained by high temperatures (>250°C), near-complete reduction of marine sulfates and a partial contribution from evaporitic sulfates." @default.
- W4245490768 created "2022-05-12" @default.
- W4245490768 date "1987-01-01" @default.
- W4245490768 modified "2023-10-18" @default.
- W4245490768 title "News items" @default.
- W4245490768 doi "https://doi.org/10.1016/0025-5408(87)90162-0" @default.
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