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A feldspar-nepheline achondrite clast in Parnallee
https://doi.org/10.15094/00004676
https://doi.org/10.15094/0000467600351856-3ce9-4877-97d2-7afefcd0bbd4
名前 / ファイル | ライセンス | アクション |
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KJ00000036482 (857.0 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1995-03-01 | |||||
タイトル | ||||||
タイトル | A feldspar-nepheline achondrite clast in Parnallee | |||||
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 | 10.15094/00004676 | |||||
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) |
Bridges,John C.
× Bridges,John C.× Hutchison,Robert× Franchi,Ian A.× Alexander,C.M. O'D.× Pillinger,Colin T. |
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著者所属(英) | ||||||
en | ||||||
Department of Mineralogy, Natural History Museum/Department of Mineralogy, Natural History Museum/Department of Earth Sciences, OpenUniversity/McDonnell Center for the Space Sciences, Washington University/Department of Earth Sciences, OpenUniversity | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | A feldspar-nepheline clast (FELINE) has been identified in Parnallee (LL3.6). Plagioclase is An_<83-87>, Ab_<17-13> and nepheline contains 0.24-3.12wt% Cl. The calculated bulk composition is mildly alkaline, with 3.5wt% Na_2O. Plagioclase has heavy REE depletion and a positive Eu anomaly (Eu/Eu^*=65). Nepheline has lower total REE than plagioclase. On a three isotope plot, the oxygen isotope composition of FELINE falls near the Carbonaceous Chondrites Anyhdrous Minerals Line, beneath the Terrestrial Fractionation Line. This suggests that the parental material had carbonaceous chondrite affinities. It was derived from a melt with moderately enriched LREE and Eu (13.5×CI), which probably underwent an influx of Na-, Cl-rich fluids during crystallisation. This LREE-enrichment suggests that Ca-pyroxene crystallised in the parent body residue during a melt extraction event. REE abundances and the oxygen isotope signature are consistent with an origin as a lost plagiophile melt fraction complementary to the ureilites. FELINE provides further evidence that achondritic fragments with an igneous, exotic origin are an important component of chondritic meteorites. | |||||
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 8, p. 195-203, 発行日 1995-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |