Other
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2105m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 10, pp.2105-2113
Other
19
Scientific paper
Concentrations and isotopic ratios of noble gases have been determined for two martian meteorites, ALH84001 and ALH77005. ALH84001, a newly recognized martian orthopyroxenite, has a high 129 Xe/ 132 Xe ratio ( 2.1), which is similar to that observed for the glass portion (lithology C) of shergottite EETA79001. The elemental ratios of trapped Ar, Kr, and Xe, the cosmic-ray exposure age (14.5 ± 1.8 m.y.) and the K---Ar age (3-4 b.y.) of ALH84001 are not identical with those of EETA79001 or any other martian meteorite. Therefore, ALH84001 may not originate from the same area as the other martian meteorites. The noble gas data of ALH77005 shergottite are compatible with previously reported data. Argon, Kr, and Xe are heavily contaminated by elementally fractionated terrestrial atmospheric gases. A cosmic-ray exposure age of 2.9 ± 0.7 m.y. and a K---Ar age of 1.33 ± 0.13 b.y. were obtained for this meteorite.
Matsubara Kayo
Miura Yayoi N.
Nagao Keisuke
Sagawa Hitoshi
Sugiura Naoji
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