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A solution model for high-temperature PbS-AgSbS2-AgBiS2 galena
-
Nathan I. Chutas
,
Victor C. Kress
Published/Copyright:
April 1, 2015
Abstract
Significant quantities of silver can be accommodated in galena as a coupled substitution with Ag + Sb and/or Ag + Bi for 2 Pb atoms. The limitations of this solubility are quantified experimentally for the cubic (Fm3̅m) α-galena phase. Above 441.7 °C, the α-galena phase has complete solid solution across the Pb2S2-AgSbS2-AgBiS2 (galena-miargyrite-matildite) ternary. Dry sinter experiments at 400, 375, and 350 °C extend the known miscibility gap on the Pb2S2-AgSbS2 binary into ternary compositions. Phase equilibrium and miscibility gap data and self-consistent thermodynamic data for other high-temperature phases in this system combined with data for other sulfides and sulfosalts are used to constrain an asymmetric regular solution model for the α-galena phase (Pb2,AgSb,AgBi) S2. Phase relations in this system suggest that simple retrograde re-equilibration during cooling can produce phase assemblages and textures commonly observed in Ag-bearing ore deposits. Bulk metal ratios of deposits in conjunction with the application of this thermodynamic model may be used to understand district Ag-distribution or as an exploration tool.
Received: 2007-5-15
Accepted: 2008-4-29
Published Online: 2015-4-1
Published in Print: 2008-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Experimental petrology;
Ag in galena;
phase equilibria;
thermodynamics;
silver deposits
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- Amorphous Materials: Properties, structure, and durability: Oxidation state of iron in hydrous phono-tephritic melts
- Amorphous materials: Properties, structure, and durability: Quantitative Raman spectroscopy: Speciation of Na-silicate glasses and melts
- Dissolution-reprecipitation of zircon at low-temperature, high-pressure conditions (Lanzo Massif, Italy)
- High-pressure behavior of gypsum: A single-crystal X-ray study
- Presence and zoning of hydrous components in leucite from the Alban Hills volcano, Rome, Italy
- Herderite from Mogok, Myanmar, and comparison with hydroxyl-herderite from Ehrenfriedersdorf, Germany
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