@article{oai:nipr.repo.nii.ac.jp:00005947,
 author = {Welten,Kees C. and Nishiizumi,Kunihiko and Caffee,Marc W. and Schafer,Joerg and Wieler,Rainer},
 journal = {Antarctic meteorite research},
 month = {Mar},
 note = {P(論文), We measured the isotopic compositions and concentrations of He, Ne and Ar as well as the concentrations of cosmogenic ^<10>Be, ^<26>Al and ^<36>Cl in 26 H-chondrites and 1 L-chondrite from a meteorite stranding area near the Frontier Mountain Range, East Antarctica. Based on the radionuclide concentrations and the noble gas signatures we conclude the 26 H-chondrite samples represent at least 13 different falls. The exposure ages of most H-chondrites are in the range of 4-10 million years (My). This age range encompasses the well-established exposure age peak at &acd;7 My and an additional feature at &acd;4 My. We determined the terrestrial ages on the basis of the ^<36>Cl concentration as well as using the relation between the ^<36>Cl/^<10>Be ratio and the ^<10>Be concentration. This relation also corrects for shielding effects and reduces the uncertainty in the age by &acd;25% compared to simple ^<36>Cl terrestrial ages. About 40% of the meteorites are older than 100 thousand years (ky), but none are older than 200ky. The relatively short terrestrial ages suggest that Frontier Mountain is a young meteorite stranding area. This seems to be supported by the bedrock exposure history, which shows a recent surface exposure&le;70ky.},
 pages = {94--107},
 title = {Terrestrial ages and exposure ages of Antarctic H-chondrites from Frontier Mountain, North Victoria Land},
 volume = {12},
 year = {1999}
}