Oxalate formation under the hyperarid conditions of the Atacama desert as a mineral marker to provide clues to the source of organic carbon on Mars

Z. Y. Cheng, D. C. Fernández-Remolar, M. R.M. Izawa, D. M. Applin, M. Chong Díaz, Maite Fernandez-Sampedro, M. García-Villadangos, T. Huang, L. Xiao, V. Parro

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this study, we report the detection and characterization of the organic minerals weddellite (CaC2O4· 2H2O) and whewellite (CaC2O4· H2O) in the hyperarid, Mars-like conditions of the Salar Grande, Atacama desert, Chile. Weddellite and whewellite are commonly of biological origin on Earth and have great potential for preserving records of carbon geochemistry and possible biological activity on Mars if they are present there. Weddellite and whewellite have been found as secondary minerals occurring inside the lower detrital unit that fills the Salar Grande basin. The extremely low solubility of most oxalate minerals inhibits detection of oxalate by ion chromatography (IC). Crystalline oxalates, including weddellite and whewellite, were detected by X-ray diffraction (XRD). The association of weddellite with surface biota and its presence among subsurface detrital materials suggest the potential of a biological origin for Salar Grande weddellite and whewellite. In this regard, biological activity is uniquely capable of concentrating oxalates at levels detectable by XRD. The complementary detection of oxalate-bearing phases through IC in the upper halite-rich unit suggests the presence of a soluble oxalate phase in the basin that is not detected by XRD. The formation, transport, and concentration of oxalate in the Salar Grande may provide a geochemical analogue for oxalate-bearing minerals recently suggested to exist on Mars.

Original languageEnglish
Pages (from-to)1593-1604
Number of pages12
JournalJournal of Geophysical Research: Biogeosciences
Volume121
Issue number6
DOIs
Publication statusPublished - Jun 1 2016
Externally publishedYes

Keywords

  • Atacama desert
  • Mars
  • biomineralization
  • chemical precipitation
  • oxalate

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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  • Cite this

    Cheng, Z. Y., Fernández-Remolar, D. C., Izawa, M. R. M., Applin, D. M., Chong Díaz, M., Fernandez-Sampedro, M., García-Villadangos, M., Huang, T., Xiao, L., & Parro, V. (2016). Oxalate formation under the hyperarid conditions of the Atacama desert as a mineral marker to provide clues to the source of organic carbon on Mars. Journal of Geophysical Research: Biogeosciences, 121(6), 1593-1604. https://doi.org/10.1002/2016JG003439