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We used INAA to analyze a 197mg bulk-rock sample, and two 7mg clasts, from Y-791197. The clasts are both anorthositic impact melt breccias. One of them contains feldspars of unusual \"ternary\" composition, probably derived from rare lunar granites. It is unclear whether Y-791197 is from the same lunar impact as the first meteorite discovered from the Moon, ALHA81005. In most respects the compositions of these two meteorites are remarkably similar. The source crater (s) must be far from the K, Th, and U-rich region, near the center of the nearside, that supplied the Apollo samples. Volatile element contents are higher in Y-791197 than in ALHA81005,and Y-791197 has a much lower mg ratio (0.64) than ALHA81005 (0.73). The mg disparity suggests that these two \"fossil\" soils formed many hundreds of meters apart (for comparison, Apollo 16 traverses spanned points up to 8km apart, yet the total range in mg among 20 analyzed regolith breccias from Apollo 16 is 0.65-0.72), or else the impact responsible for propelling them Earthward happened to occur close to a boundary between compositionally dissimilar terrains (e. g., a mare-highlands boundary). 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Geochemistry of lunar meteorite Yamato-791197: Comparison with ALHA81005 and other lunar samples
https://nipr.repo.nii.ac.jp/records/1949
https://nipr.repo.nii.ac.jp/records/1949822a22db-73a7-43ff-9099-df417df51a50
名前 / ファイル | ライセンス | アクション |
---|---|---|
KJ00000012503.pdf (1.6 MB)
|
Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
---|---|---|---|---|---|---|
公開日 | 1986-07-01 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Geochemistry of lunar meteorite Yamato-791197: Comparison with ALHA81005 and other lunar samples | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Warren,Paul H.
× Warren,Paul H.× Kallnmeyn,Gregory W. |
|||||
著者所属(英) | ||||||
en | ||||||
Institute of Geophysics and Planetary Physics, University of California/Institute of Geophysics and Planetary Physics, University of California | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Yamato-791197 is a regolith breccia from the Earth's Moon. Because lunar exploration has been of limited scope, lunar meteorites are extremely valuable sources of information about lateral variations in composition and petrology of the Moon's crust. We used INAA to analyze a 197mg bulk-rock sample, and two 7mg clasts, from Y-791197. The clasts are both anorthositic impact melt breccias. One of them contains feldspars of unusual "ternary" composition, probably derived from rare lunar granites. It is unclear whether Y-791197 is from the same lunar impact as the first meteorite discovered from the Moon, ALHA81005. In most respects the compositions of these two meteorites are remarkably similar. The source crater (s) must be far from the K, Th, and U-rich region, near the center of the nearside, that supplied the Apollo samples. Volatile element contents are higher in Y-791197 than in ALHA81005,and Y-791197 has a much lower mg ratio (0.64) than ALHA81005 (0.73). The mg disparity suggests that these two "fossil" soils formed many hundreds of meters apart (for comparison, Apollo 16 traverses spanned points up to 8km apart, yet the total range in mg among 20 analyzed regolith breccias from Apollo 16 is 0.65-0.72), or else the impact responsible for propelling them Earthward happened to occur close to a boundary between compositionally dissimilar terrains (e. g., a mare-highlands boundary). The high aluminum (plagioclase) content of Y-791197 tends to confirm the magmasphere model of earliest lunar evolution. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00733561 | |||||
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue 巻 41, p. 3-16, 発行日 1986-07 |