TY - JOUR

T1 - Micrometric inclusions in platinum-group minerals from gornaya Shoria, southern Siberia, Russia

T2 - Problems and genetic significance

AU - Nesterenko, Gleb V.

AU - Zhmodik, Sergey M.

AU - Belyanin, Dmitriy K.

AU - Airiyants, Evgeniya V.

AU - Karmanov, Nikolay S.

PY - 2019/5/1

Y1 - 2019/5/1

N2 - Micrometric inclusions in platinum-group minerals (PGMs) from alluvial placers carry considerable information about types of primary rocks and ores, as well as conditions of their formation and alteration. In the present contribution, we attempt to show, with concrete examples, the significance of the data on the composition and morphology of micrometric inclusions to genetic interpretations. The PGM grains from alluvial placers of the Gornaya Shoria region (Siberia, Russia) were used as the subject of our investigation. In order to determine the chemical composition of such ultrafine inclusions, high-resolution analytical methods are needed. We compare the results acquired by wavelength-dispersive spectrometry (WDS; electron microprobe) and energy-dispersive spectrometry (EDS) and scanning electron microscopy (SEM) methods. The results obtained have good convergence. The EDS method is multi-elemental and more effective for mineral diagnostics in comparison with WDS, which is its certain advantage. The possible conditions for the formation of inclusions and layers of gold, sulfoarsenides and arsenides in Pt3Fe grains, which have an original sub-graphic and layered texture pattern, are discussed. They are the result of solid solution and eutectic decompositions and are associated with the magmatic stages of grain transformation, including the result of the interaction of Pt3Fe with a sulfide melt enriched with Te and As.

AB - Micrometric inclusions in platinum-group minerals (PGMs) from alluvial placers carry considerable information about types of primary rocks and ores, as well as conditions of their formation and alteration. In the present contribution, we attempt to show, with concrete examples, the significance of the data on the composition and morphology of micrometric inclusions to genetic interpretations. The PGM grains from alluvial placers of the Gornaya Shoria region (Siberia, Russia) were used as the subject of our investigation. In order to determine the chemical composition of such ultrafine inclusions, high-resolution analytical methods are needed. We compare the results acquired by wavelength-dispersive spectrometry (WDS; electron microprobe) and energy-dispersive spectrometry (EDS) and scanning electron microscopy (SEM) methods. The results obtained have good convergence. The EDS method is multi-elemental and more effective for mineral diagnostics in comparison with WDS, which is its certain advantage. The possible conditions for the formation of inclusions and layers of gold, sulfoarsenides and arsenides in Pt3Fe grains, which have an original sub-graphic and layered texture pattern, are discussed. They are the result of solid solution and eutectic decompositions and are associated with the magmatic stages of grain transformation, including the result of the interaction of Pt3Fe with a sulfide melt enriched with Te and As.

KW - Gold

KW - Gornaya Shoria

KW - Micrometric inclusions

KW - Placer deposits

KW - Platinum-group elements

KW - Platinum-group minerals

KW - Russia

KW - Siberia

KW - CRYSTALLIZATION

KW - BUSHVELD COMPLEX

KW - platinum-group elements

KW - TECTONICS

KW - BEHAVIOR

KW - MICROANALYSIS

KW - GEODYNAMICS

KW - micrometric inclusions

KW - platinum-group minerals

KW - placer deposits

KW - MAGMATISM

KW - gold

KW - DEPOSITS

KW - INDICATORS

KW - GROUP ELEMENTS

UR - http://www.scopus.com/inward/record.url?scp=85068458440&partnerID=8YFLogxK

U2 - 10.3390/min9050327

DO - 10.3390/min9050327

M3 - Article

AN - SCOPUS:85068458440

VL - 9

JO - Minerals

JF - Minerals

SN - 2075-163X

IS - 5

M1 - 327

ER -