|
|
|
UDC 553.491.086:544.02(235.223-11) MICROSTRUCTURAL FEATURES OF THE PLATINUM GROUP MINERALS AS PGE REMOBILIZATION INDICATORS IN CHROMITITES OF THE EAST SAYAN OPHIOLITIES
O. N. Kiseleva, S. M. Zhmodik, D. K. Belyanin
Signs of the PGE remobilization under the influence of fluids are shown based on the study of chemical composition and microstructural features of platinum group minerals in the system Os-Ir-Ru from chromitites. Primary high-temperature solid solutions (Os-Ir-Ru), laurite (RuS2) and sulphoarsenides (Os-Ir- Ru) become unstable at low temperature. Native osmium and ruthenium can be formed during such reactions as desulphuration and dearsenization. The dissolution of primary solid solutions Os-Ir-Ru and formation of zoned crystals with Os-Ir-Ru composition is possible under relatively low temperature conditions and fixed composition of fluid containing Os, Ir, Ru.
Key words: high-and low-temperature minerals of PGE, microstructural features of platinum group minerals, remobilization of PGE.
|
|
|
|
© SNIIGGiMS, 2017. All rights reserved. | 67 Krasny pr., Novosibirsk, 630091 Russia. Tel.: 73832214947, 73832214980, fax: 73832214947