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Alluvial platinum-group minerals as indicators of primary PGE mineralization (placers of southern Siberia)

S. M. Zhmodik, G. V. Nesterenko, E. V. Airiyants, D. K. Belyanin, V. V. Kolpakov, M. Yu. Podlipsky and N. S. Karmanov
Alluvial platinum-group minerals as indicators of primary PGE mineralization (placers of southern Siberia)
Russian Geology and Geophysics (October 2016) 57 (10): 1437-1464

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 composition of PGM grains, the texture, morphology, and composition of silicate, oxide, and intermetallic microinclusions, and the type of mineral alteration can serve as efficient indicators of the primary sources of PGM. The widespread rock associations in the Kuznetsk Alatau, Gornaya Shoria, and Salair Ridge, the compositions of PGM and microinclusions in them, and the dominant mineral assemblages testify to several possible primary sources of PGE mineralization: (1) uralian-alaskan-type intrusions; (2) ophiolite associations, including those formed in a subduction zone; (3) ultramafic alkaline massifs; and, probably, (4) rocks of the picrite-basalt association. The preservation of poorly rounded and unrounded PGM grains in many of the studied placers of the Altai-Sayan Folded Area (ASFA) suggests a short transport from their primary source.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 57
Serial Issue: 10
Title: Alluvial platinum-group minerals as indicators of primary PGE mineralization (placers of southern Siberia)
Affiliation: Russian Academy of Sciences, Siberian Division, V. Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russian Federation
Pages: 1437-1464
Published: 201610
Text Language: English
Publisher: Allerton Press, New York, NY, United States
Accession Number: 2018-044552
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Based on Publisher-supplied data
N50°00'00" - N55°00'00", E80°00'00" - E100°00'00"
N52°00'00" - N56°15'00", E82°30'00" - E89°00'00"
N53°19'60" - N54°25'00", E84°19'60" - E86°55'00"
N50°00'00" - N80°00'00", W170°00'00" - E60°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
Update Code: 201824
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