Origin of Ru-Os sulfides from the Verkh-Neivinsk Ophiolite massif (Middle Urals, Russia): compositional and S-Os isotope evidence

Kreshimir N. Malitch*, Inna Yu Badanina, Elena A. Belousova, Valery V. Murzin, Tatiana A. Velivetskaya

*Corresponding author for this work

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Abstract

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 (Fo88–93). The sulfur isotope signatures of Ru-Os sulfides reveal a range of δ34 S values from 0.3 to 3.3‰, with a mean of 2.05‰ and a standard de-viation of 0.86‰ (n = 18), implying that the sulfur derived from a subchondritic source. A range of sub-chondritic initial187 Os/188 Os 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 radiogenic187 Os/188 Os 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.

Original languageEnglish
Article number329
Pages (from-to)1-21
Number of pages21
JournalMinerals
Volume11
Issue number3
DOIs
Publication statusPublished - Mar 2021

Bibliographical note

Copyright the Author(s) 2021. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • Ru-Os sulfides
  • laurite
  • erlichmanite
  • sulfur isotopes
  • osmium isotopes
  • ophiolite
  • mantle
  • Verkh-Neivinsk massif
  • Urals
  • Russia

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