Nitrogen and heavy noble gases in ALH 84001 - Signatures of ancient Martian atmosphere

Details Nitrogen and heavy noble gases in ALH 84001 - Signatures of ancient Martian atmosphere Nitrogen and heavy noble gases in ALH 84001 - Signatures of ancient Martian atmosphere

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61.5417n&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 61, p. 5417

Computer Science

Mars Atmosphere, Nitrogen, Rare Gases, Planetary Evolution, Snc Meteorites, Atmospheric Composition, Gas Density, Chemical Elements

Scientific paper

A bulk sample and three density separates of the Martian orthopyroxenite ALH 84001 were studied with the objective of deciphering the noble gas (Xe, Kr, and Ar) and nitrogen components. The results clearly show the presence of a Martian atmospheric component which is characterized by xenon isotopic ratios very similar to those found in EET 79001,C. Trapped xenon and nitrogen in ALH 84001 are consistent with a two-component mixture of Chassigny type and EET 79001,C type components. In addition, xenon shows a small contribution from in situ fission from U-238 and also a Xe-129 excess due to in situ decay of live I-129 in high temperature fractions. The implications of the analysis results for the evolution of the Martian atmosphere are discussed

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