Evidence for Multiple Diagenetic Episodes in Ancient Fluvial-Lacustrine Sedimentary Rocks in Gale Crater, Mars

C. N. Achilles, E. B. Rampe, R. T. Downs, T. F. Bristow, D. W. Ming, R. V. Morris, D. T. Vaniman, D. F. Blake, A. S. Yen, A. C. McAdam, B. Sutter, C. M. Fedo, S. Gwizd, L. M. Thompson, R. Gellert, S. M. Morrison, A. H. Treiman, J. A. Crisp, T. S.J. Gabriel, S. J. ChiperaR. M. Hazen, P. I. Craig, M. T. Thorpe, D. J. Des Marais, J. P. Grotzinger, V. M. Tu, N. Castle, G. W. Downs, T. S. Peretyazhko, R. C. Walroth, P. Sarrazin, J. M. Morookian

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The Curiosity rover's exploration of rocks and soils in Gale crater has provided diverse geochemical and mineralogical data sets, underscoring the complex geological history of the region. We report the crystalline, clay mineral, and amorphous phase distributions of four Gale crater rocks from an 80-m stratigraphic interval. The mineralogy of the four samples is strongly influenced by aqueous alteration processes, including variations in water chemistries, redox, pH, and temperature. Localized hydrothermal events are evidenced by gray hematite and maturation of amorphous SiO2 to opal-CT. Low-temperature diagenetic events are associated with fluctuating lake levels, evaporative events, and groundwater infiltration. Among all mudstones analyzed in Gale crater, the diversity in diagenetic processes is primarily captured by the mineralogy and X-ray amorphous chemistry of the drilled rocks. Variations indicate a transition from magnetite to hematite and an increase in matrix-associated sulfates suggesting intensifying influence from oxic, diagenetic fluids upsection. Furthermore, diagenetic fluid pathways are shown to be strongly affected by unconformities and sedimentary transitions, as evidenced by the intensity of alteration inferred from the mineralogy of sediments sampled adjacent to stratigraphic contacts.

Original languageEnglish (US)
Article numbere2019JE006295
JournalJournal of Geophysical Research: Planets
Volume125
Issue number8
DOIs
StatePublished - Aug 1 2020

Keywords

  • Mars
  • XRD
  • diagenesis
  • mineralogy

ASJC Scopus subject areas

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

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