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

Published online by Cambridge University Press:  03 November 2020

Roman S. Palamarchuk Open the ORCID record for Roman S. Palamarchuk [Opens in a new window] ,
Sergey Yu. Stepanov ,
Aleksandr V. Kozlov ,
Dmitry A. Khanin ,
Dmitry A. Varlamov ,
Andrey A. Zolotarev ,
Daria V. Kiseleva  and
Vladimir V. Shilovskikh
Roman S. Palamarchuk*
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, territory of the Ilmeny State Reserve, Miass, 456317, Chelyabinsk District, Russia
Sergey Yu. Stepanov
Affiliation:
St. Petersburg State University, Geology chair, 7-9 Universitetskaya naberezhnaya, St. Petersburg, 199034, Russia
Aleksandr V. Kozlov
Affiliation:
St. Petersburg Mining University, 2, 21st Line, St Petersburg199106, Russia
Dmitry A. Khanin
Affiliation:
Institute of Experimental Mineralogy RAS, 4 Akademika Osypyana str., Chernogolovka142432, Russia
Dmitry A. Varlamov
Affiliation:
Institute of Experimental Mineralogy RAS, 4 Akademika Osypyana str., Chernogolovka142432, Russia
Andrey A. Zolotarev
Affiliation:
St. Petersburg State University, Geology chair, 7-9 Universitetskaya naberezhnaya, St. Petersburg, 199034, Russia
Daria V. Kiseleva
Affiliation:
The Zavaritsky Institute of Geology and Geochemistry UB RAS, 15 Akademika Vonsovskogo str., Ekaterinburg620016, Russia
Vladimir V. Shilovskikh
Affiliation:
St. Petersburg State University, Geology chair, 7-9 Universitetskaya naberezhnaya, St. Petersburg, 199034, Russia
*
*Author for correspondence: Roman S. Palamarchuk, Email: [email protected]
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Abstract

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.

Keywords

platinum placer depositsUralian–Alaskan type massifUral platinum beltKamenushensky massifPGMOs–Ir–Ru alloys
Type
Article
Information
Mineralogical Magazine , Volume 84 , Issue 6 , December 2020 , pp. 900 - 912
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Irina O Galuskina

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