書誌事項
- タイトル別名
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- Trace element and isotope characteristics of fault rocks and coseismic fluid-rock interactions in fault zones
- ダンソウガン ノ ビリョウ ゲンソ ソセイ ・ ドウイタイ ソセイ カラ ミタ ジシンジ ノ リュウタイ ガンセキ ソウゴ サヨウ
この論文をさがす
抄録
In this paper, we review recent progress on an attempt at evaluating coseismic fluid-rock interactions in fault zones on the basis of trace element and isotope analyses of fault rocks. The slip zone rocks from Taiwan Chelungpu fault at 1 km depth exhibit marked decreases of lithium, rubidium, cesium and 87Sr/86Sr and an increase of strontium relative to adjacent host sedimentary rocks. Model calculations reveal that these trace element and isotope spectra were produced by coseismic fluid-rock interactions at >350℃, which may have caused a dynamic decrease of friction along the fault through thermal pressurization. The slip zone rocks from a major reverse fault in the Boso Emi accretionary complex at 1-2 km depth also show similar evidence for coseismic fluid-rock interactions at high temperatures. For the slip zone rocks from the Shimanto accretionary complex in Kure area, which represent rocks of ancient megaspray fault at 2.5-5.5 km depth, the signals derived from high-temperature fluids overlap with those from melting, indicating coseismic fluid-rock interactions followed by frictional melting. These results demonstrate that high-temperature fluid-rock interactions widely occur during seismic slip and geochemical characteristics of the fault rocks are useful indicators of such coseismic events.
収録刊行物
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- 地球化学
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地球化学 46 (4), 217-230, 2012
一般社団法人日本地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390001205741931648
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- NII論文ID
- 110009577761
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- NII書誌ID
- AN00141280
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- ISSN
- 21885923
- 03864073
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- NDL書誌ID
- 024225992
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可
