Stepanov, Sergey Yu., Palamarchuk, Roman S., Kutyrev, Anton V.  ORCID: https://orcid.org/0000-0001-5933-6455, Shilovskikh, Vladimir V. and Petrov, Sergey V.
2023.
Mineralogy and geochemistry of platinum-group elements in the zoned mafic-ultramafic intrusions of the Uralian Platinum belt, Russia.
Journal of Geochemical Exploration
246
, 107155.
10.1016/j.gexplo.2023.107155
|
Abstract
Three styles of platinum-group element mineralization occur within the Ural-Alaskan type complexes of the Uralian Platinum belt: chromite-platinum, noble metal, and noble metal-copper ones. They are associated with dunite and chromitite (chromite-platinum), pyroxenite (noble metal) and gabbro (noble metal-copper). Three common platinum group element distribution patterns are observed for dunite and chromitite: (1) M-shaped (defined by positive Ir and Pt anomalies); (2) with positive Ir-Rh(Pt) anomalies; and (3) W-shaped with positive Os and Pt, or Os and Rh anomalies. In contrast, pyroxenite and gabbro are enriched in Pd and Au. The PGM assemblages correlate to the PGE + Au distribution patterns as exemplified by the predominance of Ir-rich Pt-Fe alloys within dunite and chromitite. The noble metal assemblages of pyroxenite and gabbro comprise tellurides, arsenides, and various Pd minerals, as well as native gold and Au-Ag alloy. An indicative Pd/Ir ratio in a succession dunite-chromitite-gabbro increases from 0.04 to 148 with a maximum value of ~5000 in massive sulfide ore of the Volkovsky that is attributable to the contrasting magma compositions defining chromite vs sulfide controls over PGE concentration.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Earth and Environmental Sciences |
| Publisher: | Elsevier |
| ISSN: | 0375-6742 |
| Date of Acceptance: | 2 December 2022 |
| Last Modified: | 05 Nov 2024 16:00 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/173102 |
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