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XRD analyses showed that the sediment consists of randomly ordered mixed layer illite–smectite (I–S) with low illite content (> 40 wt.%), quartz (30 wt.%), illite (10–20 wt.%), plagioclase (10 wt.%), kaolinite (+ chlorite) (5 wt.%), and calcite (0–10 wt.%). The observed mineralogical assemblage indicates that location of the decollement formation was not constrained by mechanical heterogeneities associated with mineralogical variations, but was controlled by spatial variations in effective pressure. Within the over-consolidated sediment located above the incipient decollement zone, the occurrence of abundant smectite with a shape-preferred orientation gave rise to smectite swelling, producing pressures in the order of ~ 3.0 MPa. The combined effect of high swelling pressure and high pore pressure resulted in an overpressured zone at the base of the over-consolidated zone, facilitating the development of a decollement zone within the prism."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420564276185296128","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"40568713"},{"@type":"NRID","@value":"1000040568713"},{"@type":"CINII_AUTHOR_ID","@value":"DA19440723"},{"@type":"URI","@value":"https://ci.nii.ac.jp/author/DA19440723#entity"},{"@type":"URI","@value":"https://viaf.org/viaf/NII%7CDA19440723"},{"@type":"NRID","@value":"9000391830112"},{"@type":"NRID","@value":"9000362802321"},{"@type":"NRID","@value":"9000376926092"},{"@type":"NRID","@value":"9000391835380"},{"@type":"NRID","@value":"9000391832741"},{"@type":"NRID","@value":"9000345295974"},{"@type":"NRID","@value":"9000327448692"},{"@type":"NRID","@value":"9000259288532"},{"@type":"NRID","@value":"9000347136250"},{"@type":"NRID","@value":"9000000931517"},{"@type":"NRID","@value":"9000016864058"},{"@type":"NRID","@value":"9000333924099"},{"@type":"NRID","@value":"9000387918854"},{"@type":"NRID","@value":"9000347136507"},{"@type":"NRID","@value":"9000257839582"},{"@type":"NRID","@value":"9000361706722"},{"@type":"NRID","@value":"9000254148280"},{"@type":"NRID","@value":"9000388528882"},{"@type":"NRID","@value":"9000345295980"},{"@type":"NRID","@value":"9000347083642"},{"@type":"NRID","@value":"9000414092419"},{"@type":"NRID","@value":"9000380969592"},{"@type":"NRID","@value":"9000283725975"},{"@type":"NRID","@value":"9000403551854"},{"@type":"NRID","@value":"9000256022316"},{"@type":"NRID","@value":"9000257729300"},{"@type":"NRID","@value":"9000391831315"},{"@type":"NRID","@value":"9000283726855"},{"@type":"NRID","@value":"9000003809378"},{"@type":"NRID","@value":"9000391831033"},{"@type":"NRID","@value":"9000347082992"},{"@type":"NRID","@value":"9000403550491"},{"@type":"NRID","@value":"9000272993662"},{"@type":"NRID","@value":"9000403551832"},{"@type":"NRID","@value":"9000347136193"},{"@type":"NRID","@value":"9000254262842"},{"@type":"NRID","@value":"9000254262264"},{"@type":"NRID","@value":"9000396139783"},{"@type":"NRID","@value":"9000347136395"},{"@type":"NRID","@value":"9000396139980"},{"@type":"NRID","@value":"9000403551801"},{"@type":"NRID","@value":"9000258415274"},{"@type":"NRID","@value":"9000283903689"},{"@type":"NRID","@value":"9000347083799"},{"@type":"NRID","@value":"9000347082757"},{"@type":"NRID","@value":"9000002107182"},{"@type":"NRID","@value":"9000314388072"},{"@type":"NRID","@value":"9000411999551"},{"@type":"NRID","@value":"9000283903338"},{"@type":"NRID","@value":"9000347136420"},{"@type":"NRID","@value":"9000347083820"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/jkameda"}],"foaf:name":[{"@value":"Jun 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