| タイトル | Atmospheric rare gases in lunar rock 60015 |
| 著者（英） | Niemeyer, S.; Leich, D. A. |
| 著者所属（英） | California Univ. |
| 発行日 | 1976-01-01 |
| 言語 | eng |
| 内容記述 | Aliquots of lunar rock 60015 were subjected to various types of exposure and handling designed to produce terrestrial contamination, in order to test the possibility of a terrestrial origin for the terrestrial-like trapped Xe reported for lunar rock samples. Crushing the rock produced up to order-of-magnitude increases in the abundances of Ar, Kr, and Xe relative to the millimeter-sized chips of 60015 previously analyzed. Contrary to expectations for atmospheric contamination, high temperatures (above 1000 C) were necessary to remove about 75% of the trapped Kr and Xe, and the rare-gas elemental abundance ratios differed from those in terrestrial samples believed to have occluded atmospheric gases. It is concluded, on the basis of similar temperature-release profiles and elemental-fractionation patterns, that the trapped Xe observed in all these 60015 analyses is atmospheric contamination. Such a conclusion cannot unequivocally be drawn for other lunar rocks containing terrestrial-like Xe, but the present results demonstrate that arguments based on high extraction temperatures and elemental abundance ratios cannot be useful to rule out rare-gas atmospheric contamination in such samples. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 77A34688 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/437918 |
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