2016
DOI: 10.1016/j.rgg.2016.09.002
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Alluvial platinum-group minerals as indicators of primary PGE mineralization (placers of southern Siberia)

Abstract: The platinum-group minerals (PGM) in placer deposits provide important information on the types of their primary source rocks and ores and formation and alteration conditions. Different characteristics of minerals can be determined by a set of conventional and modern in situ analytical techniques (scanning electron microscopy (SEM) and electron probe microanalysis (EPMA)). A study of PGM from placers of southern Siberia (Kuznetsk Alatau, Gornaya Shoria, and Salair Ridge) shows that the morphology and compositi… Show more

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Cited by 11 publications
(5 citation statements)
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“…Indeed, the above observations [99] pertain to many occurrences of placer PGM. Surface corrosion features are obvious in many localities, and a certain degree of PGE mobility has been documented by newly-formed nm-to µm-sized crystalline PGM [27][28][29][30][100][101][102] or PGE-biofilms [103] on and in cavities of pre-existing residual PGM grains. However, relative to the total budget of the alluvial PGM assemblages, these PGM neoformations play an insignificant role.…”
Section: Pgm In Placersmentioning
confidence: 99%
“…Indeed, the above observations [99] pertain to many occurrences of placer PGM. Surface corrosion features are obvious in many localities, and a certain degree of PGE mobility has been documented by newly-formed nm-to µm-sized crystalline PGM [27][28][29][30][100][101][102] or PGE-biofilms [103] on and in cavities of pre-existing residual PGM grains. However, relative to the total budget of the alluvial PGM assemblages, these PGM neoformations play an insignificant role.…”
Section: Pgm In Placersmentioning
confidence: 99%
“…The composition of micro-lamellae was as follows: 92-95 at.% Os, 6-1 at.% Ru, 0-4 at.% Ir ( Table 7, data points No. [37][38][39][40][41][42][43][44][45][46][47][48][49][50]. The sizes of the micro-nodules were few µm.…”
Section: Resultsmentioning
confidence: 99%
“…No published information on the PGM content of most gold placer occurrences is available, but PGMs are generally present in low-grade placers, ranging from 0.03%-0.05% to a few percent of native gold (from 0.5-10.0 mg/m 3 to 500-800 mg/m 3 of rock). At some localities; however, the proportion of PGM makes up as much as 10-30 vol.% of the particles of gold [35][36][37][38].…”
Section: Introductionmentioning
confidence: 99%
“…The size of the oxide does not allow the calculation of the mineral formula, but according to the atomic ratio, it corresponds to the AO 2 stoichiometry. Oxides of the PGE are currently described in the platinum mineralization of ophiolite complexes of the Urals, Finland, and Oman [9,17,53], including in the alluvial deposits of Chukotka [53,54], Gornaya Shoria [55], Western Sayan [23], among others.…”
Section: Rim On Os-ir-ru Alloysmentioning
confidence: 99%