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Trapped noble gases indicate lunar origin for Antarctic meteorite (1983)

Johnson, P. ; Bogard, D. D.

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Publication Date: 2011-08-18

Description: The isotopic abundances of the noble gases (He, Ne, Ar, Kr, Xe) are reported for Antarctic ALHA 81005. It contains solar wind-implanted gases whose absolute and relative concentrations are quite similar to lunar regolith samples but not to other meteorites. ALHA 81005 also contains a large excess Ar-40 component which is identical to the component in lunar fines implanted from the lunar atmosphere. Large concentrations of cosmogenic Ne-21, Kr-82, and Xe-126 in ALHA 81005 indicate a total cosmic ray exposure age of at least 200 million years. The noble gas data alone are strong evidence for a lunar origin of this meteorite.

Keywords: LUNAR AND PLANETARY EXPLORATION

Type: Geophysical Research Letters (ISSN 0094-8276); 10; Sept

Format: text

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