Direct data on the ore potential of acid magmas of the Uzel’ginskoe ore field (Southern Urals, Russia)

Викентьев, И. В.; Borisova, Anastassia Y.; Karpukhina, V. S.; Наумов, В. Б.; Ryabchikov, I. D.

doi:10.1134/s1028334x12030300

Cited by 18 publications

(3 citation statements)

References 8 publications

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“…The concentration of NaCl, the main electrolyte salt, varies widely, with the average value close to ∼0.5−1 m (0.6−6 wt %; see, for example, review of hydrothermal fluid compositions in Seward et al 1 ). In particular, in hydrothermal fluids that formed the volcanogenic massive sulfide (VMS) deposits the chloride concentration ranged from few to 20 wt % NaCl equiv (e.g., Large; 2 Simonov et al; 3 Vikent'ev et al; 4,5 Karpukhina et al 6 ). Similar concentrations of chloride salts, with the average value of 4−8 wt % NaCl equiv and maximum concentration up to 26 wt % NaCl equiv, were established in hydrothermal vent fluids of black smokersmodern analogues of VMS deposits.…”

Section: Introductionmentioning

confidence: 99%

“…). In particular, in hydrothermal fluids that formed the volcanogenic massive sulfide (VMS) deposits the chloride concentration ranged from few to 20 wt % NaCl equiv (e.g., Large; Simonov et al; Vikent’ev et al; , Karpukhina et al). Similar concentrations of chloride salts, with the average value of 4–8 wt % NaCl equiv and maximum concentration up to 26 wt % NaCl equiv, were established in hydrothermal vent fluids of black smokersmodern analogues of VMS deposits. − High-salinity (>30 wt % NaCl equiv) hydrogen-bearing brines were formed as a result of serpentinization of mantle harzburgite at the Mid-Atlantic Ridge at temperatures close to 500 °C .…”

Section: Introductionmentioning

confidence: 99%

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Gold Transport in Hydrothermal Chloride-Bearing Fluids: Insights from in Situ X-ray Absorption Spectroscopy and ab Initio Molecular Dynamics

Тагиров

Trigub

Filimonova

et al. 2018

ACS Earth Space Chem.

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Chloride-bearing fluids are widespread in the Earth’s interior from low-temperature subsurface conditions to deep lithosphere. The concentration of chloride salts varies from diluted aqueous solutions to concentrated brines and anhydrous (dry) chloride melts beneath volcanoes. Here we report an investigation of the state of Au in hydrothermal chloride fluids and anhydrous melts by means of in situ X-ray absorption spectroscopy combined with ab initio molecular dynamics simulations and thermodynamic modeling. The experiments included registration of Au L3-edge X-ray absorption near edge structure/extended X-ray absorption fine structure spectra of Au-bearing fluids in the temperature range from 350 to 575 °C at pressures of 150–4500 bar. Spectra of Au dissolved in dry CsCl/NaCl/KCl + K2S2O8 melt were recorded at 650 °C. It was found that Au is coordinated by two Cl atoms (R Au–Cl = 2.25–2.28 Å). The alkali metal atoms (Me) were detected in the distant coordination sphere of Au at R Au‑Me = 3.3–4.1 Å. The alkali metal cations in the vicinity of Au–Cl complex partly compensate the positive charge located on Au and, by this way, affect the Au–Cl distance. An increase of the fluid pressure causes expansion of the second coordination sphere composed of the alkali metal cations, which leads to the increase of the positive Au charge and results in slight contraction of the first coordination sphere of Au. Accordingly, the transport of Au in high-temperature chloride-bearing natural ore-forming fluids of moderate to high densities (>0.3 g·cm–3) can be explicitly described by the formation of the AuCl2 – at any salt concentration from low-salinity fluids to hydrosaline liquids and anhydrous melts. In general, this means that the hydrothermal fluid chemistry simplifies with increasing temperature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gold Transport in Hydrothermal Chloride-Bearing Fluids: Insights from in Situ X-ray Absorption Spectroscopy and ab Initio Molecular Dynamics

Тагиров

Trigub

Filimonova

et al. 2018

ACS Earth Space Chem.

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“…The Uzelga deposit is an example of a long-lived, volcanic-related, seafloor/subseafloor ore-forming system [32,36,81,[87][88][89]. The formation of main sulfide masses was synchronous with the Late Eifelian basalt-rhyolitic magmatism and was coeval with the terrigenous-carbonate sedimentation, ca.…”

Section: Geological Settingmentioning

confidence: 99%

U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes

et al. 2020

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We report on the application of the U-Th-He method for the direct dating of pyrite and provide an original methodological approach for measurement of U, Th and He in single grains without loss of parent nuclides during thermal extraction of He. The U-Th-He age of ten samples of high-crystalline stoichiometric pyrite from unoxidized massive ores of the Uzelga volcanogenic massive sulfide (VMS) deposit, South Urals, is 382 ± 12 Ma (2σ) (U concentrations ~1–5 ppm; 4He ~10−4 cm3 STP g−1). This age is consistent with independent (biostratigraphic) estimations of the age of ore formation (ca, 389–380 Ma) and is remarkably older than the probable age of the regional prehnite-pumpellyite facies metamorphism (~340–345 Ma). Our results indicate that the U-Th-He dating of ~1 mg weight pyrite sample is possible and open new perspectives for the dating of ore deposits. The relative simplicity of U-Th-He dating in comparison with other geochronological methods makes this approach interesting for further application.

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Inter-phase Partitioning of Pb and Zn in Granitoid Fluid-Magmatic Systems: Experimental Study

Chevychelov

2020

Advances in Experimental and Genetic Mineralogy

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Direct data on the ore potential of acid magmas of the Uzel’ginskoe ore field (Southern Urals, Russia)

Cited by 18 publications

References 8 publications

Gold Transport in Hydrothermal Chloride-Bearing Fluids: Insights from in Situ X-ray Absorption Spectroscopy and ab Initio Molecular Dynamics

Gold Transport in Hydrothermal Chloride-Bearing Fluids: Insights from in Situ X-ray Absorption Spectroscopy and ab Initio Molecular Dynamics

U-Th-He Geochronology of Pyrite from the Uzelga VMS Deposit (South Urals)—New Perspectives for Direct Dating of the Ore-Forming Processes

Inter-phase Partitioning of Pb and Zn in Granitoid Fluid-Magmatic Systems: Experimental Study

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