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As-Sb Exchange Energies in Tetrahedrite-Tennantite Fahlores and Bournonite-Seligmannite Solid Solutions

Published online by Cambridge University Press:  05 July 2018

Richard O. Sack  and
Denton S. Ebel
Richard O. Sack
Affiliation:
Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana, 47907, U.S.A.
Denton S. Ebel
Affiliation:
Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana, 47907, U.S.A.
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Abstract

Reversed brackets on As and Sb partitioning between tetrahedrite-tennantite fahlores {∼CU10(Fe,Zn)2(Sb,As)4S13} and bournonite-seligmannite solid solutions {CuPb(Sb,As)S3} (400°C evacuated silica tubes, NH4Cl flux) indicate that the maximum nonidealities associated with the As-Sb substitution are about 165 (bournonite) and 250 (fahlore) cal/gfw on a per atom exchange basis. The experimental constraints are consistent with the following calibration of the As-Sb exchange reaction between these phases:

where kcal/gfw, X2 = Zn/(Zn + Fe) (or one-half the number of Zn atoms/formula unit) and X3 = As/(As + Sb) refer to atomic ratios in fahlore, and ΔG°23 = ΔH°23 = 2.59 ± 0.14 kcal/gfw (Raabe and Sack, 1984; Sack and Loucks, 1975; O'Leary and Sack, 1987; Sack, 1992).

Keywords

fahlorethermodynamicsbournonitetetrahedriteexperimentAs-Sb-Cu-Pb-Fe-Zn-Ssulphosaltgeothermometer
Type
Mineralogy
Information
Mineralogical Magazine , Volume 57 , Issue 389 , December 1993 , pp. 635 - 642
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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