PGM MINERALS FROM PLACER OF THE MURZINKA-ADUI GRANITE GNEISSIC COMPLEX AND THEIR POSSIBLE SOURCES
The paper presents the results of study of PGM minerals found in a small placer of the MurzinkaAdui granite gneissic block, Central Urals. We studied 65 PGM grains 0.1–0.8 mm in size including 42, 21, and 2 grains of the Os-Ir-Ru (±Pt, Rh) and Pt-Fe (±Ir, Rh, Pd) system, and sperrylite (PtAs2 ), res...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
South Urals Federal Research Center of Mineralogy and Geoecology UB RAS
2015-03-01
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| Series: | Минералогия |
| Subjects: | |
| Online Access: | https://journal.mineralogy.ru/wp-content/uploads/2019/09/2015-6.pdf |
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| Summary: | The paper presents the results of study of PGM minerals found in a small placer of the MurzinkaAdui granite gneissic block, Central Urals. We studied 65 PGM grains 0.1–0.8 mm in size including 42, 21, and 2 grains of the Os-Ir-Ru (±Pt, Rh) and Pt-Fe (±Ir, Rh, Pd) system, and sperrylite (PtAs2 ), respectively. An assemblage of fusible and refractory PGE minerals in the studied placer is similar to the Nurali-Verkhneyvinsky type of PGE mineralization that may indicate that chromitities from transitional zone between dunite-harzburgite series of ophiolite rocks to the banded duniteclinopyroxenite ones are the main PGM source. The Os-Ru trend of variation in compositions was distinguished for the first time for the Os-Ir-Ru hexagonal alloys, but the importance of this trend is still unknown. Possible PGM sources including the run-off from the nearest Pt-bearing ultramafic massifs or destruction of small serpentinite bodies known in the studied area are discussed. |
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| ISSN: | 2313-545X 2782-2044 |