Characteristics, distribution, origin, and significance of opaline silica observed by the Spirit rover in Gusev crater, Mars

Steven Ruff, Jack Farmer, Wendy M. Calvin, Kenneth E. Herkenhoff, Jeffrey R. Johnson, Richard V. Morris, Melissa S. Rice, Raymond E. Arvidson, James Bell, Philip Christensen, Steven W. Squyres

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

The presence of outcrops and soil (regolith) rich in opaline silica (∼65-92 wt % SiO2) in association with volcanic materials adjacent to the "Home Plate" feature in Gusev crater is evidence for hydrothermal conditions. The Spirit rover has supplied a diverse set of observations that are used here to better understand the formation of silica and the activity, abundance, and fate of water in the first hydrothermal system to be explored in situ on Mars. We apply spectral, chemical, morphological, textural, and stratigraphic observations to assess whether the silica was produced by acid sulfate leaching of precursor rocks, by precipitation from silica-rich solutions, or by some combination. The apparent lack of S enrichment and the relatively low oxidation state of the Home Plate silica-rich materials appear inconsistent with the originally proposed Hawaiian analog for fumarolic acid sulfate leaching. The stratiform distribution of the silica-rich outcrops and their porous and brecciated microtextures are consistent with sinter produced by silica precipitation. There is no evidence for crystalline quartz phases among the silica occurrences, an indication of the lack of diagenetic maturation following the production of the amorphous opaline phase.

Original languageEnglish (US)
Article numberE00F23
JournalJournal of Geophysical Research E: Planets
Volume116
Issue number4
DOIs
StatePublished - 2011

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Mars craters
Silicon Dioxide
crater
Mars
silica
silicon dioxide
outcrops
leaching
Leaching
Sulfates
sulfates
outcrop
Quartz
Acids
sulfate
sinter
acids
hydrothermal systems
regolith
distribution

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Characteristics, distribution, origin, and significance of opaline silica observed by the Spirit rover in Gusev crater, Mars. / Ruff, Steven; Farmer, Jack; Calvin, Wendy M.; Herkenhoff, Kenneth E.; Johnson, Jeffrey R.; Morris, Richard V.; Rice, Melissa S.; Arvidson, Raymond E.; Bell, James; Christensen, Philip; Squyres, Steven W.

In: Journal of Geophysical Research E: Planets, Vol. 116, No. 4, E00F23, 2011.

Research output: Contribution to journalArticle

Ruff, Steven ; Farmer, Jack ; Calvin, Wendy M. ; Herkenhoff, Kenneth E. ; Johnson, Jeffrey R. ; Morris, Richard V. ; Rice, Melissa S. ; Arvidson, Raymond E. ; Bell, James ; Christensen, Philip ; Squyres, Steven W. / Characteristics, distribution, origin, and significance of opaline silica observed by the Spirit rover in Gusev crater, Mars. In: Journal of Geophysical Research E: Planets. 2011 ; Vol. 116, No. 4.
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