Hydrogen isotopic compositions in Allan Hills 84001 and the evolution of the Martian atmosphere

Details Hydrogen isotopic compositions in Allan Hills 84001 and the evolution of the Martian atmosphere Hydrogen isotopic compositions in Allan Hills 84001 and the evolution of the Martian atmosphere

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..373s&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 2, pp. 373-380 (2000).

Computer Science

10

Scientific paper

Hydrogen isotopic compositions of carbonate and maskelynite in ALH84001 were measured by SIMS. ?D values of both minerals show considerable deviation. The deviation seems to be caused by addition of varying amounts of terrestrial water in the case of carbonate. In the case of maskelynite, H is heterogeneously distributed in maskelynite and the deviation in ?D values seems to be due to mixing of this indigenous heavy H with isotopically normal H present in the SIMS chamber. The indigenous ?D value in ALH 84001 seems to be ~2000 deg. Carbonate rather than maskelynite seems to be the main carrier of H in ALH84001. Since ALH84001 is about 4 billion years old, the H isotopic composition suggests that a large fraction of the initial Martian atmosphere has already escaped by 4 billion years ago.

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