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Petrology of Yamato-791493, lodranite: Melting, crystallization, cooling history, and relationship to other meteorites
https://nipr.repo.nii.ac.jp/records/1964
https://nipr.repo.nii.ac.jp/records/1964d91709ad-847a-40c1-90ff-b7d1b12d67b4
名前 / ファイル | ライセンス | アクション |
---|---|---|
KJ00000012518 (3.0 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 | Petrology of Yamato-791493, lodranite: Melting, crystallization, cooling history, and relationship to other meteorites | |||||
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) |
Nagahara,Hiroko
× Nagahara,Hiroko× Ozawa,Kazuhito |
|||||
著者所属(英) | ||||||
en | ||||||
Geological Institute, University of Tokyo/Geological Institute, University of Tokyo | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Yamato-791493 is a unique meteorite which is similar to Lodran, an associated "stony-iron" meteorite, but it differs from Lodran in that it contains plagioclase. Y-791493 consists of small spinel, large euhedral to subhedral olivine and orthopyroxene, anhedral clinopyroxene, metallic iron-nickel, troilite, plagioclase, and merrillite. Textural and petrofabric studies show that Y-791493 was not formed by an accumulation of crystals on the stagnant floor of a reservoir but was formed in the presence of strong magmatic laminar flow. Y-791493 cooled continuously from high temperature (above 1200℃) to low temperature (below 500℃) without any thermal interruption. The estimated cooling rate from 800 to 600℃ is (10)^3℃/Ma. Orthopyroxene and clinopyroxene show compositional zoning formed during cooling from about 1100 to 800℃. The composition of spinel shows a strong size dependence due to differences in crystallization (Al, Cr, and Ti) and in subsolidus equilibration (Mg and Fe). Similarity in major element abundances to H-chondrites suggests that the precursor material of Y-791493 was similar to the average H-chondrite but was more enriched in Mn and P. Y-791493 was formed by partial melting of the precursor material, followed by crystallization of major portion with minor loss of partial melt under more reduced conditions than the average H-chondrite. From the bulk major chemical and mineralogical similarities, it is suggested that Y-791493 has an intimate genetical relationship to the Lodran, Acapulco, and ALH-77081 meteorites, and probably to "winonaites", Brachina, and silicates in IAB and IIICD irons. These meteorites were formed from a common precursor material in the same parental body, but by different degree of melting. Lodran is a product of the largest degree of melting followed by Y-791493 and Acapulco or ALH-77081. | |||||
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. 181-205, 発行日 1986-07 |