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Article

Origin of Ru-Os Sulfides from the Verkh-Neivinsk Ophiolite Massif (Middle Urals, Russia): Compositional and S-Os Isotope Evidence

1
Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences, Vonsovsky 15, 620016 Ekaterinburg, Russia
2
Centre of Excellence for Core to Crust Fluid Systems, Department of Earth and Environmental Sciences, Macquarie University, Sydney, NSW 2109, Australia
3
Far East Geological Institute, Far Eastern Branch of the Russian Academy of Sciences, Prospect 100-letya Vladivostoku 159, 690022 Vladivostok, Russia
*
Author to whom correspondence should be addressed.
Academic Editors: Shoji Arai and Mauricio Calderón
Minerals 2021, 11(3), 329; https://doi.org/10.3390/min11030329
Received: 31 December 2020 / Revised: 24 February 2021 / Accepted: 17 March 2021 / Published: 22 March 2021
This study presents new compositional and S-Os isotope data for primary Ru-Os sulfides within a platinum-group mineral (PGM) assemblage from placer deposits associated with the Verkh-Neivinsk massif, which is part of the mantle ophiolite association of Middle Urals (Russia). The primary nature of Ru-Os sulfides represented by laurite (RuS2)–erlichmanite (OsS2) series is supported by occurrence of euhedral inclusions of high-Mg olivine (Fo92–94) that fall within the compositional range of mantle (primitive) olivine (Fo 88–93). The sulfur isotope signatures of Ru-Os sulfides reveal a range of δ34S values from 0.3 to 3.3‰, with a mean of 2.05‰ and a standard deviation of 0.86‰ (n = 18), implying that the sulfur derived from a subchondritic source. A range of sub-chondritic initial 187Os/188Os values defined for Ru-Os sulfides (0.1173–0.1278) are clearly indicative of derivation from a sub-chondritic source. Re-depletion (TRD) ages of the Verkh-Neivinsk Ru-Os sulfides are consistent with prolonged melt-extraction processes and likely multi-stage evolution of highly siderophile elements (HSE) within the upper mantle. A single radiogenic 187Os/188Os value of 0.13459 ± 0.00002 determined in the erlichmanite is indicative of a supra-chondritic source of HSE. This feature can be interpreted as evidence of a radiogenic crustal component associated with a subduction event or as an indication of an enriched mantle source. The mineralogical and Os-isotope data point to a high-temperature origin of the studied PGM and two contrasting sources for HSE in Ru-Os sulfides of the Verkh-Neivinsk massif. View Full-Text
Keywords: Ru-Os sulfides; laurite; erlichmanite; sulfur isotopes; osmium isotopes; ophiolite; mantle; Verkh-Neivinsk massif; Urals; Russia Ru-Os sulfides; laurite; erlichmanite; sulfur isotopes; osmium isotopes; ophiolite; mantle; Verkh-Neivinsk massif; Urals; Russia
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MDPI and ACS Style

Malitch, K.N.; Badanina, I.Y.; Belousova, E.A.; Murzin, V.V.; Velivetskaya, T.A. Origin of Ru-Os Sulfides from the Verkh-Neivinsk Ophiolite Massif (Middle Urals, Russia): Compositional and S-Os Isotope Evidence. Minerals 2021, 11, 329. https://doi.org/10.3390/min11030329

AMA Style

Malitch KN, Badanina IY, Belousova EA, Murzin VV, Velivetskaya TA. Origin of Ru-Os Sulfides from the Verkh-Neivinsk Ophiolite Massif (Middle Urals, Russia): Compositional and S-Os Isotope Evidence. Minerals. 2021; 11(3):329. https://doi.org/10.3390/min11030329

Chicago/Turabian Style

Malitch, Kreshimir N., Inna Yu. Badanina, Elena A. Belousova, Valery V. Murzin, and Tatiana A. Velivetskaya. 2021. "Origin of Ru-Os Sulfides from the Verkh-Neivinsk Ophiolite Massif (Middle Urals, Russia): Compositional and S-Os Isotope Evidence" Minerals 11, no. 3: 329. https://doi.org/10.3390/min11030329

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