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海洋地殻の構成と火成活動
http://hdl.handle.net/10191/18247
http://hdl.handle.net/10191/182478c5210f5-0196-4f88-aa02-e71fec9922b0
名前 / ファイル | ライセンス | アクション |
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112_5_668-683.pdf (529.4 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2012-06-05 | |||||
タイトル | ||||||
タイトル | 海洋地殻の構成と火成活動 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | 海洋地殻の構成と火成活動 | |||||
言語 | ||||||
言語 | jpn | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | ocean ridge | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | magmatism | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | MORB | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | spreading rate | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | oceanic crust | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 海嶺 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 火成作用 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 海嶺玄武岩 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 拡大速度 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 海洋地殻 | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
その他のタイトル | ||||||
その他のタイトル | Constitution of Oceanic Crust and Ocean Ridge Magmatism | |||||
著者 |
宮下, 純夫
× 宮下, 純夫× 前田, 仁一郎 |
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著者別名 | ||||||
識別子 | 41202 | |||||
識別子Scheme | WEKO | |||||
姓名 | Miyashita, Sumio | |||||
著者別名 | ||||||
識別子 | 41203 | |||||
識別子Scheme | WEKO | |||||
姓名 | Maeda, Jin-ichiro | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Volumetrically, magmatism at spreading axes occupies more than 60% of present day volcanism, and oceanic crust generated there covers more than two thirds of earth surface. Therefore, studies of the oceanic crust and magmatism at spreading axes yield significant insights to understanding earth evolution. Recent studies on oceanic crust through drilling, submersible surveys, dredging and geophysical exploration indicates that there is considerable variation in lithologic composition and stratigraphic sequences in oceanic crust that is dependent on the spreading rate. Typical ophiolitic stratigraphic sequences are expected to occur at fast-spreading ridges, while complicated and variable stratigraphic successions are encountered at slow-spreading ridges. Mid-Ocean Ridge Basalts (MORBs) are generally regarded as having comparatively uniform compositions. Major element compositions of MORB corrected for low-pressure fractionation show a global systematic variation correlated to axial highs, which can be ascribed to the degree of partial melting. However, the composition of MORB should represent a final product of magmas whose compositions have been greatly modified during ascent through mantle peridotite, by crustal fractionation that produced lower crust (ultramafic to gabbroic cumulates), and by mixing in a melt lens in shallow crust. Therefore, to fully understand MORB petrogenesis it is necessary to study the total magmatic system, which includes surface lavas, dike complexes, plutonic cumulates extracted from melts, and residual mantle. Recent results from the MARK area of the Mid-Atlantic Ridge, the Atlantis bank of the Southwest Indian Ridge and Hess Deep near the East Pacific Rise strongly suggest that source mantle is heterogeneous and that the magmatic system differs significantly depending on the spreading rate. | |||||
書誌情報 |
地学雑誌 en : 地学雑誌 巻 112, 号 5, p. 668-683, 発行日 2003-10 |
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出版者 | ||||||
出版者 | 東京地学協会 | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0022135X | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00322536 | |||||
著者版フラグ | ||||||
値 | publisher |