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Mineralogy and geochemistry of platinum-group elements in the zoned mafic-ultramafic intrusions of the Uralian Platinum belt, Russia.
- Source :
-
Journal of Geochemical Exploration . Mar2023, Vol. 246, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
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. • Three PGE mineralization styles are linked to specific lithologies in the Ural-Alaskan type complexes. • Three types of PGE patterns (M-, W-shaped and Ir-Rh ± Pt) are typical of dunite and chromitite. • Pyroxenite and gabbro show sulfide-controlled patterns with enrichment in Au and Pd. • Platinum-group mineral assemblages correlate to the PGE + Au distribution patterns. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PLATINUM group
*MINERALOGY
*GEOCHEMISTRY
*TELLURIDES
*PRECIOUS metals
*DUNITE
Subjects
Details
- Language :
- English
- ISSN :
- 03756742
- Volume :
- 246
- Database :
- Academic Search Index
- Journal :
- Journal of Geochemical Exploration
- Publication Type :
- Academic Journal
- Accession number :
- 161693189
- Full Text :
- https://doi.org/10.1016/j.gexplo.2023.107155