Chemical and Os-Isotopic Composition of Ru–Os Sulfides from the Verkh-Neivinsky Dunite-Harzburgite Massif (Middle Urals, Russia)
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This study presents new chemical and isotope data for Ru–Os sulfides and coexisting platinum-group minerals (PGMs) within primary assemblage derived from the Verkh-Neivinsky dunite-harzburgite massif. PGMs were studied using electron microprobe analysis, laser ablation and multiple collector-inductively coupled plasma-mass spectrometry. The obtained results are consistent with: (i) high-temperature formation of Ru–Os sulfides and coexisting Os-bearing alloys, (ii) presence of two contrasting sources in the ore formation (i.e., subchondritic and suprachondritic), (iii) resemblance of the initial Os-isotope composition in coexisting laurite and Os-bearing alloy, (iv) significant Os-isotope variations in individual PGMs from the primary assemblage, and (v) potential of using model 187Os/188Os ages of PGMs for geodynamic paleoreconstructions.
The authors are grateful to V.V. Khiller and N.J. Pearson for assistance in conducting analytical work. This study was supported by the Federal Agency of Scientific Organizations (no. 0393-2016-0017) and Ministry of Science and Higher Education of the Russian Federation (no. AAAA-A18-118052590026-5), and is related to the RFBR grant no. 16-05-00967-a and IGCP-662. This is contribution 1218 from the ARC Centre of Excellence for Core to Crust Fluid Systems (http://www.ccfs.mq.edu.au) and 1262 in the GEMOC Key Centre (http://www.gemoc.mq.edu.au).
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