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  1. 050 理学部
  2. 10 学術雑誌論文
  3. 10 査読済論文
  1. 0 資料タイプ別
  2. 01 学術雑誌論文

海洋地殻の構成と火成活動

http://hdl.handle.net/10191/18247
http://hdl.handle.net/10191/18247
8c5210f5-0196-4f88-aa02-e71fec9922b0
名前 / ファイル ライセンス アクション
112_5_668-683.pdf 112_5_668-683.pdf (529.4 kB)
Item type 学術雑誌論文 / Journal Article(1)
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

WEKO 41200

宮下, 純夫

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前田, 仁一郎

× 前田, 仁一郎

WEKO 41201

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
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
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