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

doi:10.3390/min11030329

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

ARC Centre of Excellence for Core to Crust Fluid Systems (incorporation ARC National Key Centre for Geochemical evolution and Metallogeny of Continents (GEMOC))

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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 (Fo_92–94) 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 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 (T_RD) 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 language	English
Article number	329
Pages (from-to)	1-21
Number of pages	21
Journal	Minerals
Volume	11
Issue number	3
DOIs	https://doi.org/10.3390/min11030329
Publication status	Published - 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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title = "Origin of Ru-Os sulfides from the Verkh-Neivinsk Ophiolite massif (Middle Urals, Russia): compositional and S-Os isotope evidence",

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.",

keywords = "Ru-Os sulfides, laurite, erlichmanite, sulfur isotopes, osmium isotopes, ophiolite, mantle, Verkh-Neivinsk massif, Urals, Russia",

author = "Malitch, {Kreshimir N.} and Badanina, {Inna Yu} and Belousova, {Elena A.} and Murzin, {Valery V.} and Velivetskaya, {Tatiana A.}",

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.",

year = "2021",

month = mar,

doi = "10.3390/min11030329",

language = "English",

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pages = "1--21",

journal = "Minerals",

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T1 - Origin of Ru-Os sulfides from the Verkh-Neivinsk Ophiolite massif (Middle Urals, Russia)

T2 - compositional and S-Os isotope evidence

AU - Malitch, Kreshimir N.

AU - Badanina, Inna Yu

AU - Belousova, Elena A.

AU - Murzin, Valery V.

AU - Velivetskaya, Tatiana A.

N1 - 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.

PY - 2021/3

Y1 - 2021/3

N2 - 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.

AB - 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.

KW - Ru-Os sulfides

KW - laurite

KW - erlichmanite

KW - sulfur isotopes

KW - osmium isotopes

KW - ophiolite

KW - mantle

KW - Verkh-Neivinsk massif

KW - Urals

KW - Russia

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U2 - 10.3390/min11030329

DO - 10.3390/min11030329

M3 - Article

AN - SCOPUS:85102726902

VL - 11

SP - 1

EP - 21

JO - Minerals

JF - Minerals

SN - 2075-163X

IS - 3

M1 - 329

ER -

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

Abstract

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Keywords

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