Phase relations among tellurides, sulfides, and oxides: I. Thermochemical data and calculated equilibria

A. M. Afifi, W. C. Kelly, E. J. Essene

Research output: Contribution to journalArticlepeer-review

214 Scopus citations

Abstract

Thermodynamic data for binary tellurides are compiled and combined with available data for sulfides and oxides to calculate phase relations among tellurides, sulfides, and oxides at low temperatures (100°-300°C). Limits on the natural range in f Te2, f S2, and f O2 values during telluride deposition and/or reequilibrium are estimated from natural assemblages relative to reactions, such as 2Fe 3O 4 + 3S 2 + 3Te 2 = 3FeS 2 + 3FeTe 2 + 4O 2 and 2HgS + Te 2 = 2HgTe + S 2. Calculated equilibria show that tellurides of Mo, Sn, Mn and Zn are unstable with respect to corresponding sulfides and/or oxides in natural systems and that some tellurides, such as As 2Te 3 are likely to occur in nature, although they have not yet been found as minerals. The composition of electrum in equilibrium with hessite is useful as a sliding-scale indicator of the fugacity of Te 2 at relatively low values of f Te2. The calculated phase relations explain particular associations or antipathies among ore minerals and may be used to predict other minerals which should be present at equilibrium. -Authors

Original languageEnglish (US)
Pages (from-to)377-394
Number of pages18
JournalEconomic Geology
Volume83
Issue number2
DOIs
StatePublished - 1988
Externally publishedYes

ASJC Scopus subject areas

  • Economic Geology
  • Geochemistry and Petrology
  • Geology
  • Geophysics

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