@article{oai:nipr.repo.nii.ac.jp:00010088,
 author = {Nagao, Keisuke and Park, Jisun and Choi, Hoon Gong and Nagao, Keisuke and Park, Jisun and Choi, Hoon Gong},
 issue = {3},
 journal = {Polar science, Polar science},
 month = {Sep},
 note = {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., レルゾライト質シャーゴッタイトに分類される火星起源隕石Yamato 000027とYamato 000097およびYamato 000027に存在する溶融脈部分の希ガス同位体組成を測定した。希ガスデータは、これらの隕石が地球落下時に割れたペアであるという岩石学や鉱物学からの見解を支持している。宇宙線照射年代460万年は、これまでに研究されたALH77005, Y793605, NWA1950, LEW88516と同様であり、これらレルゾライト質隕石が火星から同時に放出されたことが明らかになった。測定値40Ar/36Ar=1900、129Xe/132Xe=1.6、84Kr/132Xeなどは、これらYamato隕石中に火星大気起源の希ガスが含まれていることを示している。},
 pages = {195--214},
 title = {Noble gases of the Yamato 000027 and Yamato 000097 lherzolitic shergottites from Mars},
 volume = {2},
 year = {2008}
}