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Temperature and oxygen fugacity constraints on CK and R chondrites and implications for water and oxidation in the early solar system
https://nipr.repo.nii.ac.jp/records/10063
https://nipr.repo.nii.ac.jp/records/10063555b91f7-7681-4103-a1ea-b7a1cbc0c23c
Item type | 学術雑誌論文 / Journal Article(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2014-10-15 | |||||
タイトル | ||||||
タイトル | Temperature and oxygen fugacity constraints on CK and R chondrites and implications for water and oxidation in the early solar system | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Temperature and oxygen fugacity constraints on CK and R chondrites and implications for water and oxidation in the early solar system | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Oxygen fugacity | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Amphibole | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Magnetite | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Ilmenite | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Sulfide | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Oxidation | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Oxygen fugacity | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Amphibole | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Magnetite | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Ilmenite | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Sulfide | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Oxidation | |||||
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 | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Righter, K.
× Righter, K.× Neff, K.E.× Righter, K.× Neff, K.E. |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Recent chondritic meteorite finds in Antarctica have included CB, CH, CK and R chondrites, the latter two of which are among the most oxidized materials found in meteorite collections. In this study we present petrographic and mineralogic data for a suite of CK and R chondrites, and compare to previous CK and R chondrites, as well as some CV. In particular we focus on the opaque minerals - magnetite, chromite, sulfides, and metal - as well as unusual silicates - hornblende, biotite, and plagioclase. Several mineral thermometers and oxy-barometers are utilized to calculate temperatures and oxygen fugacities for these unusual meteorites compared to other more common chondrite groups. R and CK chondrites show lower equilibrium temperatures than ordinary chondrites, even though they are at similar petrologic grades (e.g., thermal type 6). Oxygen fugacity calculated for CV and R chondrites ranges from values near the iron-wustite (IW) oxygen buffer to near the fayalite-magnetite-quartz (FMQ) buffer. In comparison, the fO2 recorded by ilmenite-magnetite pairs from CK chondrites are much higher, from FMQ + 2 to FMQ + 4.5. The latter values are the highest recorded for materials in meteorites, and place some constraints on the formation conditions of these magnetite-bearing chondrites. Differences between mineralogic and O isotopic compositions of CK and R chondrites suggest two different oxidation mechanisms, which may be due to high and low water:rock ratios during metamorphism, or to different fluid compositions, or both. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 酸化度が高く稀にしか発見されないCK、Rコンドライトの不透明物質に注目して酸素分圧を比較解析した結果、CK、Rコンドライトには異なった酸化メカニズムが作用した可能性があることを示しています。 | |||||
書誌情報 |
Polar science en : Polar science 巻 1, 号 1, p. 25-44, 発行日 2007-08 |
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出版者 | ||||||
出版者 | 国立極地研究所 | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 18739652 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA12240481 | |||||
論文ID(NAID) | ||||||
識別子タイプ | NAID | |||||
関連識別子 | 110006385861 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | http://doi.org/10.1016/j.polar.2007.04.002 | |||||
関連名称 | 10.1016/j.polar.2007.04.002 |