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The Pb isotopic composition is extremely nonradiogenic compared with those of typical Apollo mare basalts. The Pb-Pb, U-Pb, and Th-Pb ages are concordant at 3.94Ga. The U-Pb data from maskelynitized plagioclase does not plot on the internal isochrons defined by other mineral separates, indicating that it was disturbed by a later shock event(s). The U-Th-Pb systematics of Asuka-31,combined with previous results, suggest a scenario for the early Pb isotope evolution of the Moon. According to the currently popular hypothesis for lunar origin, following a collision between the Earth and another large planetesimal, the Moon was formed mainly from the Earth\u0027s mantle and partially from the other impactor. The primary ^\u003c238\u003eU/^\u003c204\u003ePb (μ) value of the Moon had been increased four to five times that of the Earth\u0027s mantle value (\u0026acd;8) by volatilization of Pb during the impact. 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U-Th-Pb isotopic systematics of lunar meteorite Asuka-31
https://doi.org/10.15094/00004568
https://doi.org/10.15094/000045685b9a431a-7125-4371-bfee-53d94aeadb73
名前 / ファイル | ライセンス | アクション |
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KJ00000036374 (3.9 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1992-03-01 | |||||
タイトル | ||||||
タイトル | U-Th-Pb isotopic systematics of lunar meteorite Asuka-31 | |||||
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 | |||||
ID登録 | ||||||
ID登録 | 10.15094/00004568 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Misawa, Keiji
× Misawa, Keiji× Tatsumoto, Mitsunobu× Yanai, Keizo |
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著者所属(英) | ||||||
en | ||||||
U.S. Geological Survey | ||||||
著者所属(英) | ||||||
en | ||||||
U.S. Geological Survey | ||||||
著者所属(英) | ||||||
en | ||||||
National Institute ofPolar Research | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | U-Th-Pb isotopic systematics indicate that Asuka-31 is of lunar origin and was formed 3940±8Ma. The Pb isotopic composition is extremely nonradiogenic compared with those of typical Apollo mare basalts. The Pb-Pb, U-Pb, and Th-Pb ages are concordant at 3.94Ga. The U-Pb data from maskelynitized plagioclase does not plot on the internal isochrons defined by other mineral separates, indicating that it was disturbed by a later shock event(s). The U-Th-Pb systematics of Asuka-31,combined with previous results, suggest a scenario for the early Pb isotope evolution of the Moon. According to the currently popular hypothesis for lunar origin, following a collision between the Earth and another large planetesimal, the Moon was formed mainly from the Earth's mantle and partially from the other impactor. The primary ^<238>U/^<204>Pb (μ) value of the Moon had been increased four to five times that of the Earth's mantle value (∿8) by volatilization of Pb during the impact. Further depletion of Pb within the Moon's mantle is believed to have occurred during lunar core formation. The chalcophile behavior of Pb and large partition coefficient of Pb in silicate minerals compared to those of U and Th helped to decrease μ values of early cumulates that formed from the magma ocean and settled in the deep lunar mantle. The μ values of later cumulates gradually increased as a result of extensive fractionation. We suggest that Asuka-31 originated from partial melting of early cumulates enriched with sulfides. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10784627 | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Meteorites 巻 5, p. 3-22, 発行日 1992-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |