{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1362262944906112000.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/95jb00675"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F95JB00675"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/95JB00675"}}],"dc:title":[{"@value":"Décollement processes at the Nankai accretionary margin, southeast Japan: Propagation, deformation, and dewatering"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>The décollement zone, expressed on seismic profiles and observed in drill cores from the Nankai accretionary margin off the southeast coast of Japan, reveals several unique characteristics which appear to distinguish it from thrust faults identified in the same setting. Physical manifestations of these include evidence for the asymmetric distribution of deformation structures about the décollement, the extension of this fault zone well in front of the tectonic deformation front, and the absence of features indicative of precursory shear, for example, folded sediments, shear bands, and penetrative mineral fabrics. These characteristics suggest that the mode of formation and evolution of this décollement zone may be unique from that of most thrust faults. We propose that the décollement zone propagates not as a shear fracture controlled by tectonic stress conditions but rather as a subhorizontal tension fracture propagating under high pore pressures. To test this possibility, physical property measurements and clay mineral fabrics were obtained for several samples from the Nankai décollement zone using computed tomography and X ray texture methods. Our findings suggest that deformation within the décollement zone is partitioned into a volumetric component, preserved as reduced porosities within coherent fragments, and a localized shear component, evidenced by mineral preferred orientations along discrete slip surfaces. We suggest that the reduced porosities result from the destruction of “cementation” in the sediments during the early stages of deformation and may arise from cyclic fatiguing of the sediment induced by fluctuating pore pressures. The nonpenetrative shear fabrics probably develop as the tectonic deformation front migrates seaward, and the weakened protodécollement subsequently accommodates shear displacements along discrete fractures.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1382262944906112001","@type":"Researcher","foaf:name":[{"@value":"Julia K. Morgan"}]},{"@id":"https://cir.nii.ac.jp/crid/1382262944906112000","@type":"Researcher","foaf:name":[{"@value":"Daniel E. Karig"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"01480227"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Solid Earth"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"1995-08-10","prism:volume":"100","prism:number":"B8","prism:startingPage":"15221","prism:endingPage":"15231"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F95JB00675"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/95JB00675"}],"createdAt":"2004-02-04","modifiedAt":"2023-09-22","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360285707329514368","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"The role of compaction contrasts in sediments in décollement initiation in an accretionary prism"}]},{"@id":"https://cir.nii.ac.jp/crid/1361975845851215360","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Mixed deformation styles observed on a shallow subduction thrust, Hikurangi margin, New Zealand"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001205256514944","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"地震などの動的外力とプレート沈み込み運動を受けるデコルマの力学挙動に関する数値実験"},{"@language":"en","@value":"Numerical tests on the formation mechanism of the décollement zone due to earthquake-induced dynamic force and plate tectonics"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282680233214080","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"高圧動的載荷を受けた房総産シルト岩と藤森粘土の巨視的・微視的特性に基づくプレート境界断層の初期形成メカニズムに関する一考察"},{"@language":"en","@value":"Research on formation mechanism of plate boundary fault by investigating the macro-micro characteristics of semi-lithified trench-slope siltstone from the Boso Peninsula and Fujinomori clay subjected to dynamic load under high confining pressure"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282680740785152","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Mechanical properties of soft sedimentary rock under <i>K</i><sub>0</sub> and isotropic cyclic loading conditions"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681216262016","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Structural characteristics of shallow portion of plate subduction zone: A forearc system in the southern Boso Peninsula, central Japan"},{"@language":"ja","@value":"付加型沈み込み帯浅部の地質構造：房総半島南部付加体-被覆層システム"},{"@value":"巡検案内書 付加型沈み込み帯浅部の地質構造 : 房総半島南部付加体-被覆層システム"},{"@language":"ja-Kana","@value":"ジュンケン アンナイショ フカガタ シズミ コミ タイセンブ ノ チシツ コウゾウ : ボウソウ ハントウ ナンブ フカタイ-ヒフクソウ システム"}]},{"@id":"https://cir.nii.ac.jp/crid/2051433317070231936","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Geotechnical behavior of mudstones from the Shimanto and Boso accretionary complexes, and implications for the Nankai accretionary prism"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1029/95jb00675"},{"@type":"CROSSREF","@value":"10.1016/j.margeo.2011.02.011_references_DOI_8wO38GIjIgxyqYIuEuoB3kgJCyS"},{"@type":"CROSSREF","@value":"10.1186/1880-5981-66-129_references_DOI_8wO38GIjIgxyqYIuEuoB3kgJCyS"},{"@type":"CROSSREF","@value":"10.5575/geosoc.2016.0057_references_DOI_8wO38GIjIgxyqYIuEuoB3kgJCyS"},{"@type":"CROSSREF","@value":"10.3208/jgssp.jpn-074_references_DOI_8wO38GIjIgxyqYIuEuoB3kgJCyS"},{"@type":"CROSSREF","@value":"10.3208/jgs.11.353_references_DOI_8wO38GIjIgxyqYIuEuoB3kgJCyS"},{"@type":"CROSSREF","@value":"10.1130/g46367.1_references_DOI_8wO38GIjIgxyqYIuEuoB3kgJCyS"},{"@type":"CROSSREF","@value":"10.3208/jgs.11.341_references_DOI_8wO38GIjIgxyqYIuEuoB3kgJCyS"}]}