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Effects of terrestrial weathering on the matrix mineralogy of Colony CO3 chondrite
https://doi.org/10.15094/00005944
https://doi.org/10.15094/0000594428ea3e5d-f9ca-49a3-be29-8159434b1648
名前 / ファイル | ライセンス | アクション |
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KJ00000040936 (2.4 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1999-03-01 | |||||
タイトル | ||||||
タイトル | Effects of terrestrial weathering on the matrix mineralogy of Colony CO3 chondrite | |||||
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 | 10.15094/00005944 | |||||
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) |
Noguchi,Takaaki
× Noguchi,Takaaki× Ishikawa,Kei-ichi× Ninagawa,Kiyotaka |
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著者所属(英) | ||||||
en | ||||||
Department of Materials and Biological Sciences, Ibaraki University/Department of Materials and Biological Sciences, Ibaraki University/Department of Applied Physics, Faculty of Science, Okayama University of Science | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Colony is the least metamorphosed CO chondrite (CO3.0). However, it is badly weathered. In order to show both primary and secondary features of the matrix and discuss the effects of terrestrial weathering on the matrix mineralogy of Colony, we performed combined SEM, EPMA, CL, and TEM studies on this meteorite. EPMA data of the matrix of Colony show that matrix composition was changed by terrestrial weathering. The matrix composition can be represented by three hypothetical components : an Fe-rich component (Fe hydroxide-rich weathering products), a component with olivine-like composition, and an Fe-poor, Si-rich component. TEM observation reveals that the matrix contains abundant Fe-rich poorly crystalline interstitial materials, abundant ferroan olivine (Fa_<50>-Fa_<60>), less abundant magnesian low-Ca pyroxene (En_<99-90>), magnetite, and minor amounts of spinel group minerals, troilite, and rare Ca-rich pyroxene. Among these phases, anhydrous minerals are primary minerals. The Fe-rich component estimated from EPMA data is composed of abundant Fe-enriched, nearly amorphous material, minute phyllosilicates (mainly saponite, serpentine, and minor amounts of chlorite and montomorillonite), and goethite. The Fe-poor, Si-rich component estimated from EPMA data is also composed of basically the same but seems to contain more phyllosilicates than the Fe-rich one. Matrix olivine crystals often contain planar defects parallel to (001). Such planar defects were probably formed in the initial stage of iddingsite formation by terrestrial weathering. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA11182426 | |||||
書誌情報 |
Antarctic meteorite research 巻 12, p. 36-56, 発行日 1999-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |