Oxygen and noble gas isotope constraints on the origin of ALH84001 carbonate

Details Oxygen and noble gas isotope constraints on the origin of ALH84001 carbonate Oxygen and noble gas isotope constraints on the origin of ALH84001 carbonate

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..421g&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 421.

Computer Science

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Meteoritic Composition, Mars Surface, Carbonates, Oxygen Isotopes, Xenon Isotopes, Argon Isotopes, Ion Probes, Planetary Composition, Argon Lasers, Silicates, Carbon Dioxide, Planetary Mantles

Scientific paper

Ar-Ar laser probe studies, Xe isotope analyses of individual minerals, and ion microprobe analyses of oxygen isotopes in ALH84001 carbonate were made in order to constrain the conditions and timing of its formation. The ALH84001 meteorite is believed to be from Mars. It is stated that whatever formation model for the ALH84001 carbonate is correct, the generation of heavy oxygen in Martian carbonate, starting with a primary silicate mantle reservoir of oxygen with delta O-18 about 4 percent, appears to require at some stage a low temperature isotopic exchange between water and CO2. It also seems equally plausible that the carbonate was generated by interactions involving CO2 which was already enriched in O-18.

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