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Tennahedrite Thermochemistry and Metal Zoning

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Chemical Transport in Metasomatic Processes

Part of the book series: NATO ASI 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.

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Authors and Affiliations

  1. Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN, 47907, USA

    Richard O. Sack, Denton S. Ebel & Michael J. O’Leary

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  1. Richard O. Sack
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  2. Denton S. Ebel
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  1. Department of Geology and Geophysics, University of California, Berkeley, California, 94720, USA

    Harold C. Helgeson

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Sack, R.O., Ebel, D.S., O’Leary, M.J. (1987). Tennahedrite Thermochemistry and Metal Zoning. In: Helgeson, H.C. (eds) Chemical Transport in Metasomatic Processes. NATO ASI Series, vol 218. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4013-0_27

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  • DOI: https://doi.org/10.1007/978-94-009-4013-0_27

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