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Hydrogeological responses to incoming materials at the erosional subduction margin, offshore Osa Peninsula, Costa Rica
https://oacis.repo.nii.ac.jp/records/1777
https://oacis.repo.nii.ac.jp/records/17779cf74d26-2a3c-4de9-aa7e-4e2bc25f7098
Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2019-06-24 | |||||
タイトル | ||||||
タイトル | Hydrogeological responses to incoming materials at the erosional subduction margin, offshore Osa Peninsula, Costa Rica | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題 | CRISP, Costa Rica margin, diagenesis, seismicity | |||||
資源タイプ | ||||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
著者 |
Kameda, Jun
× Kameda, Jun× Harris, Robert N.× Shimizu, Mayuko× Ujiie, Kohtaro× Tsutsumi, Akito× Ikehara, Minoru× Uno, Masaoki× Yamaguchi, Asuka× Hamada, Yohei× Namiki, Yuka× Kimura, Gaku |
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書誌情報 |
Geochemistry, Geophysics, Geosystems 巻 16, 号 8, p. 2725-2742, 発行日 2015-08-01 |
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抄録 | ||||||
内容記述 | Bulk mineral assemblages of sediments and igneous basement rocks on the incoming Cocos Plate at the Costa Rica subduction zone are examined by X‐ray diffraction analyses on core samples. These samples are from Integrated Ocean Drilling Program Expedition 334 reference Site U1381, ∼ 5 km seaward of the trench. Drilling recovered approximately 100 m of sediment and 70 m of igneous oceanic basement. The sediment includes two lithologic units: hemipelagic clayey mud and siliceous to calcareous pelagic ooze. The hemipelagic unit is composed of clay minerals (∼50 wt.%), quartz (∼5 wt.%), plagioclase (∼5 wt.%), calcite (∼15 wt.%) and ∼30 wt.% of amorphous materials, while the pelagic unit is mostly made up of biogenic amorphous silica (∼50 wt.%) and calcite (∼50 wt.%). The igneous basement rock consists of plagioclase (∼50–60 wt.%), clinopyroxene (∼>25 wt.%), and saponite (∼15–40 wt.%). Saponite is more abundant in pillow basalt than in the massive section, reflecting the variable intensity of alteration. We estimate the total water influx of the sedimentary package is 6.9 m3/yr per m of trench length. Fluid expulsion models indicate that sediment compaction during shallow subduction causes the release of pore water while peak mineral dehydration occurs at temperatures of approximately ∼100°C, 40–30 km landward of the trench. This region is landward of the observed updip extent of seismicity. We posit that in this region the presence of subducting bathymetric relief capped by velocity weakening nannofossil chalk is more important in influencing the updip extent of seismicity than the thermal regime. | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1525-2027 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1002/2015GC005837 | |||||
情報源 | ||||||
関連識別子 | https://doi.org/10.1002/2015GC005837 | |||||
関連名称 | Publisher's Version/PDF (OpenAccess) | |||||
情報源 | ||||||
関連識別子 | https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-15H05717/ | |||||
関連名称 | KAKEN研究課題: プレート境界断層超深度掘削・観測による南海トラフ巨大地震切迫度評価 | |||||
情報源 | ||||||
関連識別子 | https://nrid.nii.ac.jp/ja/nrid/1000080153188/ | |||||
関連名称 | 研究代表者: 木村学 (東京海洋大学) | |||||
件名 | ||||||
主題 | 科学研究費研究成果 | |||||
出版者 | ||||||
出版者 | American Geophysical Union | |||||
科学研究費研究課題 | ||||||
主題 | プレート境界断層超深度掘削・観測による南海トラフ巨大地震切迫度評価 | |||||
科学研究費研究課題 | ||||||
主題 | Urgency Evaluation of the Nankai Great Earthquake and Tsunami by Scientific Ocean Drilling | |||||
研究課題番号 | ||||||
内容記述 | 15H05717 |