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Vosnesensky Cu-porphyry deposit (Southern Urals): formation conditions, trace elements, sulfur isotopes and fluid sources

S.E. Znamensky, N.N. Ankusheva, D.A. Artemiev

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The paper shows new fluid inclusion and isotopic-geochemical data for minerals from sulphide-carbonate-quartz veins of Vosnesensky Cu-porphyry deposit. Fluid inclusions were analyzed by means Linkam TMS-600 cryostage equipped with Olympus BX 51 optical microscope; trace element amounts were performed used Agilent 7700x and ELAN 9000 mass-spectrometers; sulphur isotopic composition was analyzed on DeltaPLUS Advantagе mass-spectrometer. We determined that fluid inclusions in quartz were homogenized between 215 and 315 ºС, and in latest calcite, they are 230–280 ºС. Fluids are К-Na water chloride with salinity of 3–12 wt % NaCl-eq. Quartz contain high amounts of Al (184–5180 ppm), K (20.1–1040 ppm), Na (30.2–1570 ppm) and Ti (38.4–193 ppm). The REE distribution spectra of pyrite are characterized by light lanthanides accumulation (LaN/YbN = 3.6–6.44), and negative of Ce anomalies (0.7–0.92) and Eu (0.78–0.99). The Y/ Ho ratio in pyrite varies from 27.6 up to 36.8. The δ34S values in pyrite were –1.01…0.8 ‰, in chalcopyrite – 0.9 ‰. The data testify the Cu-porphyry mineralization of Vosnesensky deposit was formed due to magmatic acid high-aluminous К-Na chloride fluid enriched with light REE in mesothermal environment. We identified the geochemical markers of interaction between fluid and host rocks.

Southern Urals, Cu-porphyry deposit, fluid inclusions, trace elements, LA-ICP-MS, sulphur isotopic composition


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Sergey E. Znamensky
Institute of Geology of the Ufa Federal Research Centre of the Russian Academy of Sciences
16/2 K. Marx st., Ufa, 450077, Russian Federation
Natalya N. Ankusheva
Institute of Mineralogy of the South Urals Federal Research Center of Mineralogy and Geoecology of the Urals Branch of the Russian Academy of Sciences
1 Ilmensky Zapovednik, Miass, 456317, Russian Federation  
Dmitry A. Artemiev
Institute of Mineralogy of the South Urals Federal Research Center of Mineralogy and Geoecology of the Urals Branch of the Russian Academy of Sciences
1 Ilmensky Zapovednik, Miass, 456317, Russian Federation

For citation:

Znamensky S.E., Ankusheva N.N., Artemiev D.A. (2020). Vosnesensky Cu-porphyry deposit (Southern Urals): formation conditions, trace elements, sulfur isotopes and fluid sources. Georesursy = Georesources, 22(3), pp. 48–54. DOI: