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Contrasting Fluids in the Svetlinsk Gold-Telluride Hydrothermal System, South Urals

Published on Dec 30, 2019in Minerals2.25
· DOI :10.3390/MIN10010037
O. V. Vikent’eva5
Estimated H-index: 5
,
Vsevolod Yu. Prokofiev7
Estimated H-index: 7
+ 5 AuthorsN. S. Bortnikov9
Estimated H-index: 9
Abstract
The large gold-telluride Svetlinsk deposit (~135 t Au) is considered to be a nontraditional one in the Urals and its origin is debated. A specific feature of the deposit is the abundance of various tellurides, such as tellurides of Fe, Ni, Pb, Sb, Bi, Ag, and Au. The new data of microthermometry, Raman spectroscopy, LA-ICP-MS, and crush-leach analysis (gas and ion chromatography, ICP-MS) for fluid inclusions as well as O-isotope data for quartz were obtained for the construction of PTX parameters of ore-formation and fluid sources in the deposit. Mineralisation was formed at a wide range of temperature and pressure (200–400 °C, 1–4 kbar) and from contrasting fluids with multiple sources. At the early stages, the magmatic fluid evolved during its ascent and phase separation and the fluid derived from the host rock decarbonation and dehydration were involved in the hydrothermal system. In addition, mantle-derived fluid might be involved in the ore-forming process during gold-telluride precipitation as well as heated meteoric waters during the late stages. Early fluids were rich in H2S, S0, and CH4, while the Au-Te mineralisation was formed from N2-rich fluid.
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Fluid inclusions provide valuable information on the composition and physical and chemical parameters of mineral-forming hydrothermal fluids. Different types of gold deposits have distinctive fluid inclusions in the minerals of ore deposits [...]
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