The system Pd–Ag–S: phase relations and mineral assemblages
| Autor: | Dmitriy A. Chareev, A. V. Kristavchuk, František Laufek, Anna Vymazalová |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Mineral
010504 meteorology & atmospheric sciences Chemistry Alloy Geochemistry engineering.material 010502 geochemistry & geophysics 01 natural sciences Igneous rock Geochemistry and Petrology Ultramafic rock Phase (matter) engineering Mafic Ternary operation 0105 earth and related environmental sciences Phase diagram |
| Zdroj: | Mineralogical Magazine. 84:125-130 |
| ISSN: | 1471-8022 0026-461X |
| DOI: | 10.1180/mgm.2020.1 |
| Popis: | Phase equilibria in the system Pd–Ag–S were studied using the silica-glass tube method at 400°C and 550°C. In the system we synthesised three ternary phases: coldwellite (Pd3Ag2S), kravtsovite (PdAg2S) and a new phase Pd13Ag3S4. At 400°С, coldwellite forms a stable association with vysotskite (PdS) and vasilite (Pd16S7); vysotskite and kravtsovite; phase Pd4S and a Ag–Pd alloy; it also coexists with a new phase Pd13Ag3S4. Kravtsovite is stable up to 507°C; the presence of kravtsovite in the mineral assemblage reflects its formation below this temperature. The occurrence of coldwellite, vysotskite and Ag2S together in equilibrium reflects the formation of this mineral assemblage above this temperature (507°C). Coldwellite is stable up at 940°С. Mineral assemblages defined in this study can be expected in Cu–Ni–PGE mineral deposits, associated with mafic and ultramafic igneous rocks, in particular in mineralisations with known silver–palladium sulfides. |
| Databáze: | OpenAIRE |
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