Multi-Stage Magmatic-Hydrothermal Sulfide-PGE Mineralization of the Khudolaz Complex (South Urals)

Рахимов, И. Р.; Vishnevskiy, A. V.; Saveliev, D. E.; Salikhov, D. N.; Владимиров, А. Г.

doi:10.1134/s1075701521040061

Cited by 4 publications

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“…However, neither selenide mineralization nor even selenium impurities in PGM of the primary and placer associations were reported in the deposits belonging to the Uralian Platinum Belt . The PGE mineralogy of the South Urals is much less studied (Saveliev et al, 2017;Zaykov et al, 2011Zaykov et al, , 2012Zaykov et al, , 2017Zaykova et al, 2020;Rakhimov et al, 2021aRakhimov et al, , 2021b. Along with Rh minerals from the Miass river placers (Britvin et al, 1998(Britvin et al, , 1999(Britvin et al, , 2001, only kashinite with traces of Rh was described in chromitite from the Vladimir deposit of the Varshav ultramafic massif (Ankushev et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…The PGE mineralogy of the South Urals is much less studied (Saveliev et al , 2017; Zaykov et al , 2011, 2012, 2017; Zaykova et al , 2020; Rakhimov et al , 2021a, 2021b). Along with Rh minerals from the Miass river placers (Britvin et al , 1998, 1999, 2001), only kashinite with traces of Rh was described in chromitite from the Vladimir deposit of the Varshav ultramafic massif (Ankushev et al , 2016).…”

Section: Introductionmentioning

confidence: 99%

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Zaykovite, Rh₃Se₄, a new mineral from the Kazan placer, South Urals, Russia

Belogub

Britvin

Shilovskikh

et al. 2022

MinMag

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Zaykovite, ideally Rh3Se4, is a new mineral, the first natural rhodium selenide. It was discovered in the assemblages of platinum-group minerals from the Kazan gold placer, South Urals, Russia. The mineral occurs as crystals up to 40 μm in size within the grains of Pt3Fe alloy, in association with unnamed Pd-Sb-Te phase and Au-Pd alloy. In reflected light, zaykovite has a gray color with bluish-greeenish tint; it shows weak bireflectance and anisotropy. Reflectance values [Rmax/Rmin (%) for COM approved wavelengths (nm)]: 30.1/29.3(470), 32.2/31.0(546), 33.4/32.0(589), 35.1/33.7(650). Chemical composition corresponds to the empirical formula (Rh2.26Pt0.46Ir0.25Ru0.01Pd0.01Fe0.01)Σ3.00(Se2.77S1.21Te0.02)Σ4.00 Zaykovite is monoclinic, space group C2/m, a 10.877(1), b 11.192(1), c 6.4796(6) Å, β 108.887(2)°, V

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Zaykovite, Rh₃Se₄, a new mineral from the Kazan placer, South Urals, Russia

Belogub

Britvin

Shilovskikh

et al. 2022

MinMag

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Geochemical evolution of PGE-sulfide mineralization of the Khudolaz differentiated complex in the South urals: The role of R-factor and hydrothermal alteration

Рахимов

Vishnevskiy

Saveliev

2021

Ore Geology Reviews

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Geochemistry of Accessory Apatite from the Cu–Ni–Sulfide-Bearing Ultramafic–Mafic Rocks of the Khudolaz Complex (South Urals) as a Monitor of Magmatic and Metasomatic Processes

Рахимов

Gottman

Kholodnov

et al. 2022

Russian Geology and Geophysics

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—We present results of mineralogical and geochemical studies (optical and electron microscopy, probe microanalysis, and LA-ICP-MS) of accessory apatite from the rocks of four ore-bearing massifs of the Khudolaz Complex: Vostochnyi Buskun, Severnyi Buskun, Malyutka, and Tashly-Tau. Two groups of apatite are recognized by morphology and chemical composition: (1) “magmatic” unaltered apatite (Ap-1) in unaltered and slightly altered rocks and (2) “metasomatized” apatite (Ap-2) surrounded by secondary silicates that replaced primary minerals. Ap-1 is represented by euhedral and subhedral hexagonal crystals with a high content of chlorine (0.7–1.2 wt.% Cl) and an extremely low content of sulfur (<0.05 wt.% SO3). It is enriched in REE (ΣREE = 2.2–3.0 wt.%), shows a pronounced negative Eu anomaly (Eu/Eu* = 0.36–0.58), and is depleted in Co, Ni, and chalcophile trace elements (Zn, Pb, and Bi). The distribution of major and trace elements in Ap-1 made it possible to identify its two generations, early and late, in the Khudolaz Complex. The early generation, characterized by a low content of Ca (Т ≥ 1000 °C, CaO < 54 wt.%), crystallized almost simultaneously with Ca-plagioclase (An81–61). The late generation, characterized by a high content of Ca (Т ≥ 700 °C, CaO > 55 wt.%), is associated with Na-plagioclase (An28–8), amphibole, and phlogopite. Ap-2 is represented by highly cracked grains and is characterized by a low content of chlorine (0.0n–0.5 wt.% Cl) and a high content of sulfur (0.06–0.93 wt.% SO3). The content of fluorine in both groups of apatite varies in the same range (0.6–1.7 wt.% F), which determines its relative inertness during metasomatic processes. Ap-2 is less enriched in REE (ΣREE = 1.1–2.1 wt.%) and shows a less pronounced Eu anomaly (Eu/Eu* = 0.61–0.77) but has high contents of Co, Ni, and chalcophile trace elements. The Ap-1 and Ap-2 show different variations in contents of major elements (Fe, Mg, Na, etc.), which is due to the impact of hydrothermal fluid on the mineral at the postmagmatic stage. It is shown that the low content of sulfur in apatite from unaltered rocks does not indicate a low sulfide ore potential of the Khudolaz Complex. The Cu–Ni sulfide signature of the complex is more clearly evidenced by the composition of metasomatized apatite enriched in S, Co, Ni, and chalcophile elements as a result of their hydrothermal removal from primary sulfide minerals. The high Eu/Eu* value indicates an increase in oxygen fugacity at the postmagmatic stage.

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Multi-Stage Magmatic-Hydrothermal Sulfide-PGE Mineralization of the Khudolaz Complex (South Urals)

Cited by 4 publications

References 46 publications

Zaykovite, Rh₃Se₄, a new mineral from the Kazan placer, South Urals, Russia

Zaykovite, Rh₃Se₄, a new mineral from the Kazan placer, South Urals, Russia

Geochemical evolution of PGE-sulfide mineralization of the Khudolaz differentiated complex in the South urals: The role of R-factor and hydrothermal alteration

Geochemistry of Accessory Apatite from the Cu–Ni–Sulfide-Bearing Ultramafic–Mafic Rocks of the Khudolaz Complex (South Urals) as a Monitor of Magmatic and Metasomatic Processes

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Multi-Stage Magmatic-Hydrothermal Sulfide-PGE Mineralization of the Khudolaz Complex (South Urals)

Cited by 4 publications

References 46 publications

Zaykovite, Rh3Se4, a new mineral from the Kazan placer, South Urals, Russia

Zaykovite, Rh3Se4, a new mineral from the Kazan placer, South Urals, Russia

Geochemical evolution of PGE-sulfide mineralization of the Khudolaz differentiated complex in the South urals: The role of R-factor and hydrothermal alteration

Geochemistry of Accessory Apatite from the Cu–Ni–Sulfide-Bearing Ultramafic–Mafic Rocks of the Khudolaz Complex (South Urals) as a Monitor of Magmatic and Metasomatic Processes

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Zaykovite, Rh₃Se₄, a new mineral from the Kazan placer, South Urals, Russia

Zaykovite, Rh₃Se₄, a new mineral from the Kazan placer, South Urals, Russia