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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. 4
  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. 4

Role of Water in Conductive Anomalies and Seismic Reflections in the Lower Crust

https://doi.org/10.15083/0000032601
https://doi.org/10.15083/0000032601
da421575-6468-4619-b523-ebfb7a35b6f4
名前 / ファイル ライセンス アクション
ji0764004.pdf ji0764004.pdf (2.8 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 Role of Water in Conductive Anomalies and Seismic Reflections in the Lower Crust
言語 en
言語
言語 eng
キーワード
主題Scheme Other
主題 fluid
キーワード
主題Scheme Other
主題 lower crust
キーワード
主題Scheme Other
主題 geophysical anomaly
キーワード
主題Scheme Other
主題 ductile shear zone
キーワード
主題Scheme Other
主題 wetting property
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 10.15083/0000032601
ID登録タイプ JaLC
その他のタイトル
その他のタイトル 下部地殻の電気伝導度異常と地震波反射面への水の役割
著者 Yoshino, Takashi

× Yoshino, Takashi

WEKO 126136

Yoshino, Takashi

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著者別名
識別子Scheme WEKO
識別子 126137
姓名 芳野, 極
著者所属
著者所属 Earthquake Research Institute, University of Tokyo
著者所属
著者所属 Institute for Study of the Earth's Interior, Okayama University
抄録
内容記述タイプ Abstract
内容記述 Relationships between electrical conductivity and seismic reflection in the lower crust are discussed in terms of the presence of aqueous fluids. Tectonic/geological interpretations of the lower crustal structures revealed by recent geophysical surveys are given for the region of stable cratons, convergent margins and rift zones, respectively. Most of the lower continental crusts of the stable craton are electrically resistive, and there are little correlations between electrically conductive zones and seismically reflective zones. In the convergent plate margins, the lower crust is conductive and seismic reflectors (or bright spots) are observed at mid-crustal depth. The rift zones are also characterized by both strong anomalies in electrically conductivity and seismic reflectors throughout the lower crustal column. The strong correlation between the conductive zones and the reflective zones observed from the active convergent margins and young rift zones is possibly explained by the presence of the free fluid phase. The distribution of fluid in the lower crust is discussed from the phase relation and wetting properties of constituent minerals. The presence of anhydrous granulites in the outcrops of the lower crustal sections and xenoliths derived from the lower crust indicates that the lower crust is generally dry. In the exposed lower crustal section of the Kohistan Arc hydrous minerals are localized in the vicinity of veins and ductile shear zones developed in the host anhydrous lithology. On the other hand, wetting behavior of plagioclase the most dominant mineral in the lower crust, indicates the absence of interconnecting aqueous and CO2-rich fluids through the equilibrium intergranular channels under lower crustal P-T conditions. It suggests that fluid flow in the lower crust is not pervasive but is localized in cracks and ductile shear zones. Ductile shear zones developed in the lower crust are the most probable sites for water pathways which are responsible for conductive anomalies and seismic reflectors in the continental crust revealed by geophysical observations.
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 4, p. 479-500, 発行日 2002-03-25
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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