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Petrochemical study of the Yamato-691 enstatite chondrite (E3) IV: Descriptions and mineral chemistry of opaque-mineral nodules
https://doi.org/10.15094/00004480
https://doi.org/10.15094/0000448008a60e9a-0963-4cfd-82c3-eacb9c96adb4
名前 / ファイル | ライセンス | アクション |
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KJ00000036286 (5.0 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1989-10-01 | |||||
タイトル | ||||||
タイトル | Petrochemical study of the Yamato-691 enstatite chondrite (E3) IV: Descriptions and mineral chemistry of opaque-mineral nodules | |||||
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 | 10.15094/00004480 | |||||
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) |
Ikeda, Yukio
× Ikeda, Yukio |
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著者所属(英) | ||||||
en | ||||||
Department of Earth Sciences, Faculty of Science, Ibaraki University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Opaque-mineral nodules in Y-691 consist mainly of kamacite, perryite, schreibersite, troilite, daubreelite, niningerite, oldhamite, sphalerite, djerfisherite, caswellsilverite, graphite, roedderite, a silica mineral, albite, enstatite, and forsterite. The Ni and Si contents of kamacite are 2-3.5wt% and about 2wt%, respectively, being controlled by exsolution of perryite and schreibersite. Troilite shows a wide range of the Cr contents from 2.4 to 0.05wt%, and is classified into two types, massive and porous. The massive troilite is high in the Cr contents more than 0.6wt% and contains sometimes thin daubreelite lamellae, although the porous troilite is low in the Cr contents less than 1.2wt% and nearly free from daubreelite lamellae. The porous texture seems to be due to tiny inclusions of FeCl_2 in the troilite. Niningerite in Y-691 is the lowest in Mn and Fe contents in comparison to those in other enstatite chondrites. Djerfisherite in Y-691 is richer in Cu, Ni and Na in comparison to those in Qingzhen. Roedderite in Y-691 is similar in chemical composition to that in Indarch. Enstatite in Y-691 nodules shows a wide range of MgO/(MgO+FeO) molar ratio from 0.91 to 0.99,and sometimes forsterite occurs with a silica mineral in a nodule, suggesting that the silicates in the opaque-mineral nodules were not in equilibrium. Opaque-mineral nodules were classified into two main types based on the texture; concentric and massive, which are further divided into subtypes based on the modal volume of the main-minerals. The constituent minerals in these nodules seem to have polygenesis, and the genesis of nodules is discussed in detail. Any thermal metamorphic effects after accretion was not petrographycally detected in Y-691 nodules. | |||||
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 2, p. 109-146, 発行日 1989-10 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |