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

• Material Type: 記事
• Title: Alteration and dehydration of subducting oceanic crust within subduction zones : implications for décollement step-down and plate-boundary seismogenesis
• Author/Editor: Jun Kameda; Sayako Inoue; Wataru Tanikawa
• Publication, Distribution, etc.: 日本 : Springer Nature
• Publication Date: 2017-04-18
• Publication Date (W3CDTF): 2017-04-18
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 69(52)
• Volume: 69(52)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-017-0635-1; https://doi.org/10.1186/s40623-017-0635-1
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• Date Accepted (W3CDTF): 2017-06-22T22:40:19+09:00
• Date Captured (W3CDTF): 2017-06-22
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• Periodical Title (Persistent ID (NDL)): info:ndljp/pid/10319651; https://dl.ndl.go.jp/pid/10319651
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• Summary, etc.: 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
• Access Restrictions: インターネット公開
• Rights (production): Creative Commons Attribution 4.0 International
• Related Material (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
• Is Referenced By: 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
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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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• References (URI): https://cir.nii.ac.jp/crid/1363670320283964544
• Data Provider (Database): 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
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• Bibliographic ID (NDL): 10369079; http://id.ndl.go.jp/bib/10369079
• NAID: 120006333808