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  1. 131 地震研究所
  2. 東京大学地震研究所彙報
  3. 76
  4. 3
  1. 0 資料タイプ別
  2. 30 紀要・部局刊行物
  3. 東京大学地震研究所彙報
  4. 76
  5. 3

Transportation of H2O and Melting beneath the Japan Arcs

https://doi.org/10.15083/0000032611
https://doi.org/10.15083/0000032611
50e8c8ea-1c9e-4c57-b4f6-11c736578a1b
名前 / ファイル ライセンス アクション
ji0763010.pdf ji0763010.pdf (1.6 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2008-05-30
タイトル
タイトル Transportation of H2O and Melting beneath the Japan Arcs
言語 en
言語
言語 eng
キーワード
主題Scheme Other
主題 H2O
キーワード
主題Scheme Other
主題 melt
キーワード
主題Scheme Other
主題 subduction
キーワード
主題Scheme Other
主題 Japan arcs
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
ID登録
ID登録 10.15083/0000032611
ID登録タイプ JaLC
その他のタイトル
その他のタイトル 日本弧下の水の輸送と溶融
著者 Iwamori, Hikaru

× Iwamori, Hikaru

WEKO 126192

Iwamori, Hikaru

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著者別名
識別子Scheme WEKO
識別子 126193
姓名 岩森, 光
著者所属
著者所属 Department of Earth and Planetary Sciences, University of Tokyo
抄録
内容記述タイプ Abstract
内容記述 Recent knowledge concerning the phase relationships of hydrous peridotitic and basaltic systems allows us to model fluid generation and migration in subduction zones. Here I present: (1) numerical models for the transportation of H2O and melting beneath the Japanese islands, in which generation and migration of aqueous fluid, its interaction with the convecting solid, and melting are considered, based on the phase relationships; (2) predictions of the corresponding seismic structures based on the calculated distribution of the fluids (aqueous fluids and melts); (3) 3-D seismic tomographic images beneath the islands; (4) analyses of the distribution of the volcanoes and the volcanic chains; and (5) comparisons between the model predictions and the observations. The model calculation suggests that in northeast Japan, nearly all of the H2O expelled from the subducted Pacific plate is hosted by serpentine and chlorite just above the plate, and is brought down to~150 km. Breakdown of serpentine and chlorite at these depths results in the formation of a fluid column through which H2O is transported upwards, and results in the initiation of melting in the mantle wedge beneath the backarc. Seismic tomographic studies suggest the existence of such a melting region beneath the backarc. In central Japan, the subducted Philippine Sea plate overlaps the subducted Pacific plate. This geometry causes slow thermal recovery of the subducted Pacific plate, resulting in dehydration reactions at levels (200-300 km) deeper than in northeast Japan, and deflection of the volcanic chain towards the backarc side. In contrast, in southwest Japan, where a relatively hot part of the Philippine sea plate (Shikoku basin) subducts, the dehydration reactions are predicted to occur at relatively shallow levels (< 100 km in depth). The seismic tomographic image supports well the predicted distribution of the fluids beneath the volcanic front to the forearc region. These comparisons between the model predictions and the observations suggest that the thermal structure (determined by age and subduction velocity) of the subducting plate strongly controls the distribution of the aqueous fluids and melts in subduction zones through the position of the dehydration reactions.
書誌情報 東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo

巻 76, 号 3, p. 377-389, 発行日 2002-02-12
ISSN
収録物識別子タイプ ISSN
収録物識別子 00408972
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AN00162258
フォーマット
内容記述タイプ Other
内容記述 application/pdf
日本十進分類法
主題Scheme NDC
主題 458
出版者
出版者 東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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