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The system Pd–Ag–S: phase relations and mineral assemblages

Published online by Cambridge University Press:  10 January 2020

Anna Vymazalová Open the ORCID record for Anna Vymazalová [Opens in a new window] ,
František Laufek ,
Alexandr V. Kristavchuk  and
Dmitriy A. Chareev
Anna Vymazalová*
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic
František Laufek
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic
Alexandr V. Kristavchuk
Affiliation:
Institute of Experimental Mineralogy (IEM RAS), 142432 Chernogolovka, Moscow Region, Russia
Dmitriy A. Chareev
Affiliation:
Institute of Experimental Mineralogy (IEM RAS), 142432 Chernogolovka, Moscow Region, Russia Ural Federal University, Ekaterinburg620002, Russia Kazan Federal University, Kazan420008, Russia
*
*Author for correspondence: Anna Vymazalová, Email: anna.vymazalova@geology.cz
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Abstract

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.

Keywords

Pd–Ag–S systemphase relationsphase diagramplatinum-group mineralscoldwellitekravtsovitevysotskitevasilitephase Pd13Ag3S4
Type
Article
Information
Mineralogical Magazine , Volume 84 , Issue 1 , February 2020 , pp. 125 - 130
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2020

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Footnotes

Associate Editor: David Hibbs

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