Jarosite stability on Mars

Alexandra Navrotsky, Ferenc Lázár Forray, Christophe Drouet

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Jarosite, a potassium (sodium) iron sulphate hydrated mineral, has recently been identified on the martian surface by the Opportunity rover. Using recent thermochemical data [Drouet and Navrotsky, 2003, Geochim. Cosmochim. Acta 67, 2063-2076; Forray et al., 2005, Geochim. Cosmochim. Acta, in press], we calculate the equilibrium decomposition curve of jarosite and show that it is thermodynamically stable under most present martian pressures and temperatures. Its stability makes jarosite potentially useful to retain textural, chemical, and isotopic evidence of past history, including possible biological activity, on Mars.

Original languageEnglish (US)
Pages (from-to)250-253
Number of pages4
JournalIcarus
Volume176
Issue number1
DOIs
StatePublished - Jul 2005
Externally publishedYes

Keywords

  • Jarosite
  • Mars climate
  • Mineral stability
  • Mineralogy

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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