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Tennahedrite Thermochemistry and Metal Zoning

  • Richard O. Sack
  • Denton S. Ebel
  • Michael J. O’Leary
Part of the NATO ASI Series book series (ASIC, volume 218)

Abstract

Provisional activity-composition relations are developed for tennahedrites approximating the chemical formula (Ag,Cu)10(Fe,Zn)2−(Sb,As)4S13. These relations are based on a “Temkin” type model for the configurational entropy combined with an expression for the vibrational Gibbs energy based on a second-degree Taylor series expansion in terms of the composition variables X2≡Zn/(Zn+Fe), X3≡As/(As+Sb), and X4≡Ag/(Ag+Cu) and an ordering variable s≡\( {\rm{(X}}_{{\rm{Ag}}}^{{\rm{TRG}}}\,{\rm{ - }}\,{\rm{3/2}}\,\,{\rm{X}}_{{\rm{Ag}}}^{{\rm{TET}}}{\rm{)}} \) which describes the distribution of Ag and Cu between trigonal-planar and tetrahedral metal sites. Calibration of the parameters in the resulting expression for the Gibbs energy is based on considerations of the Ag-Cu and Fe-Zn exchange reactions between tennahedrites and other crystalline phases. This calibration gives an expression for the distribution of Ag and Cu between trigonal-planar and tetrahedral metal sites that predicts changes from trigonal-planar to tetrahedral site preference for Ag with increasing Ag/(Ag+Cu) in accord with the local maxima in cell edge observed in natural (Ag,Cu)10(Fe,Zn)2Sb4S13 tennahedrites. The resulting activity-composition relations predict extensive miscibility gaps for (Ag,Cu)10Fe2(Sb,As)4S13 and (Ag,Cu)10Zn2(Sb,As)4S13 tennahedrites consistent with the chemical variations observed in nature. They support the hypothesis that crystal energetics and As-Sb fractionation between tennahedrite and hydrothermal fluids determine the distribution of silver in many zoned Pb-Zn-Cu-Ag sulfide ore deposits.

Keywords

Gibbs Energy Hydrothermal Fluid Economic Geology Exchange Potential Volcanogenic Massive Sulfide Deposit 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1987

Authors and Affiliations

  • Richard O. Sack
    • 1
  • Denton S. Ebel
    • 1
  • Michael J. O’Leary
    • 1
  1. 1.Department of Earth and Atmospheric SciencesPurdue UniversityWest LafayetteUSA

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