Other
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..453e&link_type=abstract
In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 453-454 (SEE N94-12015 01-91)
Other
3
Achondrites, Chemical Analysis, Meteoritic Composition, Mineralogy, Radioactive Age Determination, Xenon Isotopes, Abundance, Phase Diagrams, Rare Gases
Scientific paper
The Lodran achondrite contains about one-quarter metallic Fe/Ni, two-thirds olivine and pyroxene, some troilite, plus minor phases. In a previous study we demonstrated that Lodran and three other lodranites - LEW88280, Yamato-791491, and MAC88177 - yield the same cosmic-ray exposure age of a few million years, suggesting that they originate from the same parent body. In the present work we show that the mineral phases of Lodran contain large concentrations of planetary-type but no solar-type trapped noble gases. Surprisingly, the highest concentrations were observed in the Fe/Ni-phase (e.g. 1520 x 10-12 cc STP per g (132)Xe). A large fraction of the trapped gas is released between 1200 C and 1400 C. The Xe isotopic pattern is similar to that of Xe-Q. The 1400 C fraction of the Fe/Ni-phase shows excesses of (124)Xe, (126)Xe, and (128)Xe similar to Xe-L (pre-solar Xe enriched in the light isotopes) that has, until now, only been observed in combination with Xe-H (pre-solar Xe enriched in the heavy isotopes).
Eugster Otto
Weigel Andreas
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