TY - JOUR

T1 - Platinum-group minerals from the Malaya Kamenushka River placer, Middle Urals, Russia

AU - Palamarchuk, Roman S.

AU - Stepanov, Sergey Yu

AU - Kozlov, Aleksandr V.

AU - Khanin, Dmitry A.

AU - Varlamov, Dmitry A.

AU - Zolotarev, Andrey A.

AU - Kiseleva, Daria V.

AU - Shilovskikh, Vladimir V.

N1 - Funding Information: This work was supported by Russian Foundation for basic research (RFBR) grant No. 18-35-00151\19. The authors thank the reviewers and editors of the Mineralogical Magazine for assistance with the publication of these data and conclusions. Publisher Copyright: Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2020/12

Y1 - 2020/12

N2 - This work presents a detailed study of platinum-group mineral (PGM) assemblages from the Malaya Kamenushka River placer, whose formation is associated with the weathering of the Kamenushensky Uralian-Alaskan type massif, Middle Urals, Russian Federation. The deposit is characterised by the dominance of isoferroplatinum, together with significant numbers of inclusions of Os-Ir-Ru alloys and platinum-group element (PGE) sulfides. A study of the Os-Ir-Ru alloys permitted recognition of two types of iridium with different morphology and composition. The similarity of the PGM assemblages from the Malaya Kamenushka River placer and the lode mineralisation of the Kamenushensky massif is demonstrated. A comparison of PGM assemblages from the Malaya Kamenushka River placer with other placers and massifs of the Ural platinum belt demonstrates significant differences in the number of Os-Ir-Ru inclusions. Such differences for minerals of refractory elements cannot be explained by the vertical zoning of the lode mineralisation. Most probably this is associated with the enrichment of the primary substrate with Os, Ir and Ru and/or the degree of melting, depending on the chosen model of formation of the Uralian-Alaskan type massifs.

AB - This work presents a detailed study of platinum-group mineral (PGM) assemblages from the Malaya Kamenushka River placer, whose formation is associated with the weathering of the Kamenushensky Uralian-Alaskan type massif, Middle Urals, Russian Federation. The deposit is characterised by the dominance of isoferroplatinum, together with significant numbers of inclusions of Os-Ir-Ru alloys and platinum-group element (PGE) sulfides. A study of the Os-Ir-Ru alloys permitted recognition of two types of iridium with different morphology and composition. The similarity of the PGM assemblages from the Malaya Kamenushka River placer and the lode mineralisation of the Kamenushensky massif is demonstrated. A comparison of PGM assemblages from the Malaya Kamenushka River placer with other placers and massifs of the Ural platinum belt demonstrates significant differences in the number of Os-Ir-Ru inclusions. Such differences for minerals of refractory elements cannot be explained by the vertical zoning of the lode mineralisation. Most probably this is associated with the enrichment of the primary substrate with Os, Ir and Ru and/or the degree of melting, depending on the chosen model of formation of the Uralian-Alaskan type massifs.

KW - Kamenushensky massif

KW - Os-Ir-Ru alloys

KW - PGM

KW - platinum placer deposits

KW - Ural platinum belt

KW - Uralian-Alaskan type massif

UR - http://www.scopus.com/inward/record.url?scp=85099368966&partnerID=8YFLogxK

U2 - 10.1180/mgm.2020.87

DO - 10.1180/mgm.2020.87

M3 - Article

AN - SCOPUS:85099368966

VL - 84

SP - 900

EP - 912

JO - Mineralogical Magazine

JF - Mineralogical Magazine

SN - 0026-461X

IS - 6

ER -