Alteration and dehydration of subducting oceanic crust within subduction zones : implications for décollement step-down and plate-boundary seismogenesis

• 資料種別: 記事
• タイトル: Alteration and dehydration of subducting oceanic crust within subduction zones : implications for décollement step-down and plate-boundary seismogenesis
• 著者・編者: Jun Kameda; Sayako Inoue; Wataru Tanikawa
• 出版事項: 日本 : Springer Nature
• 出版年月日等: 2017-04-18
• 出版年（W3CDTF）: 2017-04-18
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 69(52)
• 掲載巻: 69(52)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-017-0635-1; https://doi.org/10.1186/s40623-017-0635-1
• 国立国会図書館永続的識別子: info:ndljp/pid/10369079; https://dl.ndl.go.jp/pid/10369079
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• 収集根拠: オンライン資料収集制度
• 受理日（W3CDTF）: 2017-06-22T22:40:19+09:00
• 保存日（W3CDTF）: 2017-06-22
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• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• 要約等: The alteration and dehydration of predominantly basaltic subducting oceanic crustal material are thought to be important controls on the mechanical and hydrological properties of the seismogenic plate interface below accretionary prisms. This study focuses on pillow basalts exposed in an ancient accretionary complex within the Shimanto Belt of southwest Japan and provides new quantitative data that provide insight into clay mineral reactions and the associated dehydration of underthrust basalts. Whole-rock and clay-fraction X-ray diffraction analyses indicate that the progressive conversion of saponite to chlorite proceeds under an almost constant bulk-rock mineral assemblage. These clay mineral reactions may persist to deep crustal levels (similar to 320 degrees C), possibly contributing to the bulk dehydration of the basalt and supplying fluid to plate-boundary fault systems. This dehydration can also cause fluid pressurization at certain horizons within hydrous basalt sequences, eventually leading to fracturing and subsequent underplating of upper basement rock into the overriding accretionary prism. This dehydration-induced breakage of the basalt can explain variations in the thickness of accreted basalt fragments within accretionary prisms as well as the reported geochemical compositions of mineralized veins associated with exposed basalts in onland locations. This fracturing of intact basalt can also nucleate seismic rupturing that would subsequently propagate along seismogenic plate interfaces.
• DOI: 10.1186/s40623-017-0635-1; https://doi.org/10.1186/s40623-017-0635-1
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: Creative Commons Attribution 4.0 International
• 関連情報（URI）: https://hdl.handle.net/2115/66991; http://id.ndl.go.jp/digimeta/10369079; https://dl.ndl.go.jp/pid/10369079; http://link.springer.com/content/pdf/10.1186/s40623-017-0635-1.pdf; http://link.springer.com/article/10.1186/s40623-017-0635-1/fulltext.html; http://hdl.handle.net/2115/66991
• 参照: Crustal dynamics: unified understanding of geodynamic processes at different time and length scales; https://cir.nii.ac.jp/crid/1050564285813661696; Hydrothermal Friction Experiments on Simulated Basaltic Fault Gouge and Implications for Megathrust Earthquakes; https://cir.nii.ac.jp/crid/1360017279847953408; Frictional Properties of Simulated Chlorite Gouge at Hydrothermal Conditions: Implications for Subduction Megathrusts; https://cir.nii.ac.jp/crid/1361975843008977280; RockJockソフトを用いた粉末X線回折法による鉱物の定量分析に関する報告; https://cir.nii.ac.jp/crid/1390001288091191296
• 参照: Hydrogeological responses to incoming materials at the erosional subduction margin, offshore <scp>O</scp>sa <scp>P</scp>eninsula, <scp>C</scp>osta <scp>R</scp>ica; https://cir.nii.ac.jp/crid/1050587981431983232; Quartz deposition and its influence on the deformation process of megathrusts in subduction zones; https://cir.nii.ac.jp/crid/1050869456409501312; Hydrogeology and Mechanics of Subduction Zone Forearcs: Fluid Flow and Pore Pressure; https://cir.nii.ac.jp/crid/1360011142939789696; Effects of fluid circulation in subducting crust on Nankai margin seismogenic zone temperatures; https://cir.nii.ac.jp/crid/1360011142941320832; Stretching of fluid inclusions in calcite as an indicator of frictional heating on faults; https://cir.nii.ac.jp/crid/1360011146051296256; Thermal structure and paleo‐heat flow in the Shimanto accretionary prism, Southwest Japan; https://cir.nii.ac.jp/crid/1360011146085074048; Smectite to chlorite conversion by frictional heating along a subduction thrust; https://cir.nii.ac.jp/crid/1360285707111917824; A new source of water in seismogenic subduction zones; https://cir.nii.ac.jp/crid/1360285708264945536; Underplated units in an accretionary complex: Melange of the Shimanto Belt of eastern Shikoku, southwest Japan; https://cir.nii.ac.jp/crid/1360292619042493568; Subduction factory 2. Are intermediate‐depth earthquakes in subducting slabs linked to metamorphic dehydration reactions?; https://cir.nii.ac.jp/crid/1360292620207358720; On the relation between fault strength and frictional stability; https://cir.nii.ac.jp/crid/1360292620404307456; Low-grade metamorphism around the down-dip limit of seismogenic subduction zones: Example from an ancient accretionary complex in the Shimanto Belt, Japan; https://cir.nii.ac.jp/crid/1360567182476720768; Sources and physicochemical characteristics of fluids along a subduction‐zone megathrust: A geochemical approach using syn‐tectonic mineral veins in the Mugi mélange, Shimanto accretionary complex; https://cir.nii.ac.jp/crid/1360567183243227008; Comments on the growth of accretionary wedges; https://cir.nii.ac.jp/crid/1360574095218543360; Decomposition of Experimental X-Ray Diffraction Patterns (Profile Fitting): A Convenient Way to Study Clay Minerals; https://cir.nii.ac.jp/crid/1360574095607660288; Fluidization of granular material in a subduction thrust at seismogenic depths; https://cir.nii.ac.jp/crid/1360574096464323328; Tectonic mélange as fault rock of subduction plate boundary; https://cir.nii.ac.jp/crid/1360846641105441920; Large amount of fluid migration around shallow seismogenic depth preserved in tectonic mélange: Yokonami mélange, the Cretaceous Shimanto Belt, Kochi, Southwest Japan; https://cir.nii.ac.jp/crid/1360846643150274560; Hydrothermal alteration of upper oceanic crust formed at a fast-spreading ridge: mineral, chemical, and isotopic evidence from ODP Site 801; https://cir.nii.ac.jp/crid/1360855570565784320; Paleothermal structure of the Shimanto accretionary prism, Shikoku, Japan: Role of an out-of-sequence thrust; https://cir.nii.ac.jp/crid/1361137043692926464; Vitrinite reflectance and estimates of paleotemperature within the Upper Shimanto Group, Muroto Peninsula, Shikoku, Japan; https://cir.nii.ac.jp/crid/1361137045350234112; Pseudotachylyte from an ancient accretionary complex: Evidence for melt generation during seismic slip along a master décollement?; https://cir.nii.ac.jp/crid/1361418520361633792; A deep strong reflector in the Nankai accretionary wedge from multichannel seismic data: Implications for underplating and interseismic shear stress release; https://cir.nii.ac.jp/crid/1361418520445508992; Montmorillonite under high H₂O pressures; stability of hydrate phases, rehydration hysteresis, and the effect of interlayer cations; https://cir.nii.ac.jp/crid/1361418520850245248; Seismic Consequences of Warm Versus Cool Subduction Metamorphism: Examples from Southwest and Northeast Japan; https://cir.nii.ac.jp/crid/1361418521296042496; Co-seismic frictional melting along an out-of-sequence thrust in the Shimanto accretionary complex. 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The Seismogenic Zone of Subduction Thrust Faults; https://cir.nii.ac.jp/crid/1362825893881246208; Permeability structure around an ancient exhumed subduction‐zone fault; https://cir.nii.ac.jp/crid/1362825894894855808; Quantitative transmission X-ray microanalysis of ionic compounds; https://cir.nii.ac.jp/crid/1362825896229476992; Comparison of smectite- and illite-rich gouge frictional properties: application to the updip limit of the seismogenic zone along subduction megathrusts; https://cir.nii.ac.jp/crid/1363107370528551040; Depth of oceanic-crust underplating in a subduction zone: Inferences from fluid-inclusion analyses of crack-seal veins; https://cir.nii.ac.jp/crid/1363670320143149184; The Role of Randomly Mixed-Layered Chlorite/Smectite in the Transformation of Smectite to Chlorite; https://cir.nii.ac.jp/crid/1363951794391740416; Underplating process from melange formation to duplexing: Example from the Cretaceous Shimanto Belt, Kii Peninsula, southwest Japan; https://cir.nii.ac.jp/crid/1364233268348437760; Evaluation of factors controlling smectite transformation and fluid production in subduction zones: Application to the Nankai Trough; https://cir.nii.ac.jp/crid/1364233269084464512; Peeling oceanic crust in subduction zones; https://cir.nii.ac.jp/crid/1364233269756845440; High paleogeothermal gradient with ridge subduction beneath the Cretaceous Shimanto accretionary prism, southwest Japan; https://cir.nii.ac.jp/crid/1364233269767853440; 九州四万十帯北東部の地質構造と変成分帯; https://cir.nii.ac.jp/crid/1390001206237476992
• 参照（URI）: https://cir.nii.ac.jp/crid/1363670320283964544
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
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• 書誌ID（NDLBibID）: 10369079; http://id.ndl.go.jp/bib/10369079
• NII論文ID: 120006333808