Formation of Tridymite and Evidence for a Hydrothermal History at Gale Crater, Mars

A. S. Yen, R. V. Morris, D. W. Ming, S. P. Schwenzer, B. Sutter, D. T. Vaniman, A. H. Treiman, R. Gellert, C. N. Achilles, J. A. Berger, D. F. Blake, N. I. Boyd, T. F. Bristow, S. Chipera, B. C. Clark, P. I. Craig, R. T. Downs, H. B. Franz, T. Gabriel, A. C. McAdamS. M. Morrison, C. D. O’Connell-Cooper, E. B. Rampe, M. E. Schmidt, L. M. Thompson, S. J. VanBommel

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In August 2015, the Curiosity Mars rover discovered tridymite, a high-temperature silica polymorph, in Gale crater. The existing model for its occurrence suggests erosion and detrital sedimentation from silicic volcanic rocks in the crater rim or central peak. The chemistry and mineralogy of the tridymite-bearing rocks, however, are not consistent with silicic volcanic material. Using data from Curiosity, including chemical composition from the Alpha Particle X-ray Spectrometer, mineralogy from the CheMin instrument, and evolved gas and isotopic analyses from the Sample Analysis at Mars instrument, we show that the tridymite-bearing rocks exhibit similar chemical patterns with silica-rich alteration halos which crosscut the stratigraphy. We infer that the tridymite formed in-place through hydrothermal processes and show additional chemical and mineralogical results from Gale crater consistent with hydrothermal activity occurring after sediment deposition and lithification.

Original languageEnglish (US)
Article numbere2020JE006569
JournalJournal of Geophysical Research: Planets
Volume126
Issue number3
DOIs
StatePublished - Mar 2021

ASJC Scopus subject areas

  • Geophysics
  • Oceanography
  • Forestry
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology

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