Colloform high-purity platinum from the placer deposit of Koura River (Gornaya Shoriya, Russia)

G. V. Nesterenko, S. M. Zhmodik, E. V. Airiyants, D. K. Belyanin, V. V. Kolpakov, A. A. Bogush

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A microinclusion of colloform high-purity platinum in a grain of platinum-group minerals (PGM) from the alluvial gold-bearing placer deposit in the south of Western Siberia (Russia) was detected and characterized for the first time. It is different in composition, texture, and conditions of formation from high-purity platinum of other regions described in the literature. The main characteristics of investigated high-purity platinum are colloform-layered texture, admixture of Fe (0.37–0.78 wt%), and paragenesis of Cu-rich isoferroplatinum, hongshiite, and rhodarsenide. The PGM grain with high-purity platinum is multiphase and heterogeneous in texture. It is a product of intensive metasomatic transformation of Cu-rich isoferroplatinum (Pt3(Fe0.6Cu0.4)). The transformation was carried out in two stages: 1 – copper stage including three substages (Cu-rich isoferroplatinum, copper platinum and hongshiite); and 2 – arsenic (rhodarsenide). The formation of high-purity platinum was separated in time from the formation of isoferroplatinum and was carried out by precipitation from postmagmatic solutions.

Original languageEnglish
Pages (from-to)236-245
Number of pages10
JournalOre Geology Reviews
Volume91
Early online date12 Oct 2017
DOIs
Publication statusPublished - 1 Dec 2017
Externally publishedYes

Keywords

  • Alluvial placer
  • Cu-rich isoferroplatinum
  • Gornaya Shoriya
  • High-purity platinum
  • Hongshiite
  • Platinum-group elements (PGE)
  • Platinum-group minerals (PGM)

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology
  • Economic Geology

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