@article{oai:nipr.repo.nii.ac.jp:00004684,
 author = {Nagao,Keisuke and Eugster,Otto and Weigel,Andreas and Miura,Yayoi N. and Koeberl,Christian and Takaoa,Nobuo},
 journal = {Proceedings of the NIPR Symposium on Antarctic Meteorites},
 month = {Mar},
 note = {P(論文), Cosmic-ray produced ^3He, ^<21>Ne, and ^<38>Ar concentrations and the chemical composition of the Yamato-74357 lodranite have been determined. Concordant concentrations of ^3He and ^<21>Ne have been obtained on both samples (Bern and Misasa). The concentration of cosmogenic ^<38>Ar is twice as high in the Bern as in the Misasa sample. The ^3He, ^<21>Ne and ^<38>Ar data for both samples yield an average cosmic-ray exposure age of 5.8±2.0Ma. This age indicates that Yamato-74357 belongs to the lodranite group, which probably originates from a common break-up event about 5Ma ago. Radiogenic ^4He and ^<40>Ar concentrations in the Bern sample are higher than those in the Misasa sample by more than a factor of two, suggesting that minerals enriched in U, Th and K are enriched in the finer grained fraction. The isotopic compositions of Kr and Xe are identical to those of the terrestrial atmosphere, except for the ^<129>Xe abundance. The small ^<129>Xe excess (^<129>Xe/^<132>Xe=1.15±0.04) is presumably due to the early formation of this meteorite.},
 pages = {297--303},
 title = {Noble gases, chemical composition, and cosmic-ray exposure age of the Yamato-74357 lodranite},
 volume = {8},
 year = {1995}
}