Oxygen cycle of the Martian atmosphere-regolith system: <formula>Δ17O of secondary phases in Nakhla and Lafayette

Details Oxygen cycle of the Martian atmosphere-regolith system: <formula>Δ17O of secondary phases in Nakhla and Lafayette Oxygen cycle of the Martian atmosphere-regolith system: <formula>Δ17O of secondary phases in Nakhla and Lafayette

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10511991f&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue E5, p. 11991-11998

Other

21

Planetology: Solid Surface Planets: Atmospheres-Evolution, Planetology: Solid Surface Planets: Erosion And Weathering, Planetology: Solid Surface Planets: Surface Materials And Properties, Planetology: Solar System Objects: Mars

Scientific paper

Oxygen isotope fractionations among silicates, carbonates, and sulfate from Nakhla and Lafayette can be used to resolve how multiple oxygen isotope reservoirs formed and evolved on Mars and to gain insight into the environment and processes that led to the formation of the SNC carbonates and other secondary minerals. Carbonates and sulfate from Nakhla and Lafayette carry an imprint of atmospheric chemistry analogous to that documented on Earth but reflect an inhospitable environment where ozone, hydrogen peroxide, and odd oxygen compounds transferred their signature of atmospheric oxygen isotope fractionations to water, ice, and minerals that formed in the regolith at low temperature. Such an environment would not be conducive to the preservation of easily oxidized organic compounds. Its existence provides an abiotic, isotopic benchmark. Biotic processes should produce isotopic fractionations that lie on a coherent mass fractionation line and not the mass-independent fractionation relationships observed in the present study.

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