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オフィオライトかんらん岩の成因
http://hdl.handle.net/2297/36205
http://hdl.handle.net/2297/3620510dc9441-dfe8-4291-bb22-8886e075f819
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
SC-PR-ARAI-S-232.pdf (1.6 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2017-10-03 | |||||
| タイトル | ||||||
| タイトル | オフィオライトかんらん岩の成因 | |||||
| タイトル | ||||||
| タイトル | Origin of Ophiolitic Peridotites | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 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 | |||||
| 著者 |
荒井, 章司
× 荒井, 章司 |
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| 書誌情報 |
地學雜誌 = Journal of geography 巻 98, 号 3, p. 232-240, 発行日 1989-01-01 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0022-135X | |||||
| NCID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00322536 | |||||
| DOI | ||||||
| 関連タイプ | isIdenticalTo | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.5026/jgeography.98.3_232 | |||||
| 出版者 | ||||||
| 出版者 | 東京地学協会 = Tokyo Geographical Society | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Origin of spinel peridotites of upper mantle derivation, especially that of ophiolitic peridotites, is discussed mainly on the basis of compositional relationship between olivine (Fo content) and chromian spinel (Cr/(Cr+Al) atomic ratio=Cr* ratio). Spinel peridotites are distributed in a relatively narrow band, the olivine-spinel mantle array, on the Fo-Cr* plane. The olivine-spinel mantle array (=OSMA) may by a trend for residual peridotites and have a fertile tip at Fo87, Cr*=0.08 and a refractory tip at Fo93, Cr*=0.95.Lherzolite is distributed in a fertile part of the OSMA (Cr*<0.6) and harzburgite, in a refractory part (Cr*>0.4). In a subsolidus stage, the Fo-Cr* relation in spinel peridotites is notaltered by temperature variation but is severely altered by a metasomatic process. Mantle peridotites from know tectonic settings are summarized as follows; lherzolite with Cr* of 0.6-0.1 (mostly 0.4-0.2) from the ocean floor, lherzolite with Cr*<0.4 (mostly around 0.1) from the oceanic hot spot, harzburgite-lherzolite with Cr* of 0.6-0.1 from the island arc or the marginal basin (Japan island arcs), and harzburgite-lherzolite with Cr* of 0.8-0.4 from the fore-arc area. Subcontinental upper mantle is mostly made up by lherzolite with Cr* less than 0.2. Olivine and chromian spinel are also early precipitating phases from primary or nearly primary magmas. Variation of the Cr* ratio of chromian spinel monitored by the Fo content of coexisting olivine makes a “fractionation line” on the Fo-Cr* plane. The cumulative peridotite, which always contains chromian spinel, is directly correlated with its parental magma on the Fo-Cr* plane. The residual peridotite for each magma suite could be estimated by extrapolating a fractionation line back to the OSMA as follows; lherzo lite with Cr*<0.6 (mostly 0.6 to 0.4) for MORB, lherzolite with Cr*<0.5 (mostly 0.5 to 0.2) for alkali basalts, harzburgite with Cr*>0.9 for boninites, harzburgite with Cr* of 0.9-0.7 for high-magnesia andesites or high-magnesia, high-silica arc tholeiites, harzburgitelherzolite with Cr*<0.7 for arc subalkalic basalts, harzburgite with Cr* of ca. 0.7 for intraplate tholeiites. The genetical consanguinity between residual peridotites and cumulate or volcanic rocks within an ophiolite complex could be examined in terms of the Fo-Cr* relationship. | |||||
| 権利 | ||||||
| 権利情報 | Copyright © Tokyo Geographical Society 東京地学協会 | 許可を得て登録 | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| 関連URI | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://www.geog.or.jp/ | |||||
| 関連URI | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://www.jstage.jst.go.jp/browse/jgeography/-char/ja/ | |||||
