Noble gases of the Yamato 000027 and Yamato 000097 lherzolitic shergottites from Mars
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概要
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We used total melting and stepwise heating methods to measure noble gases within bulk samples from Yamato 000027 and Yamato 000097 lherzolites as well as a melt-vein sample from Yamato 000027. He and Ne are dominated by cosmogenic noble gases. The obtained cosmic-ray exposure age of 4.6 ± 1.5 Ma, an average age based on cosmogenic ^<3>He, ^<21>Ne, and ^<38>Ar for these samples, is consistent with the ages of other lherzolitic shergottites, indicating a common impact event for the ejection of lherzolites from Mars. Heavy noble gases released from the bulk samples at low temperatures were elementally fractionated terrestrial atmosphere. Martian noble-gas isotopic signatures, ^<40>Ar/^<36>Ar = 1900 and ^<129>Xe/^<132>Xe = 1.3, were observed at high temperatures (>1000 °C). The melt-vein sample released greater amounts of atmospheric Ar, Kr, and Xe at low temperatures than the bulk samples. Large amounts of Ar and Kr, as well as excess ^<40>Ar and ^<129>Xe, were evolved from the melt-vein sample at 1400 ℃, and the gas shows very high ^<36>Ar/^<132>Xe (=3100) and ^<84>Kr/^<132>Xe (=76) values. Maximum ^<40>Ar/^<36>Ar and ^<129>Xe/^<132>Xe values of the melt sample were 1100 and 1.6, respectively, at 1600 ℃. Cosmogenic Kr shows an absence of ^<80>Kr and ^<82>Kr produced by neutron capture on Br, which suggests a small pre-atmospheric body. Overall noble gas compositions for Y000027 and Y000097 support pairing for the Yamato 00 shergottites.
- 国立極地研究所の論文
著者
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NAGAO KEISUKE
Laboratory for Earthquake Chemistry, Graduate School of Science, The University of Tokyo
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Choi Hoon
Laboratory For Earthquake Chemistry Graduate School Of Science University Of Tokyo
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Nagao Keisuke
Laboratory For Earthquake Chemistry Graduate School Of Science University Of Tokyo
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Nagao Keisuke
Laboratory For Earthquake Chemistry Faculty Of Science The University Of Tokyo
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Park Jisun
Ares Code Kr Nasa Johnson Space Center
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