PaperFluid-flow pathways in actively deforming sediments: the role of pore fluid pressures and volume change
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2019, Gondwana ResearchCitation Excerpt :Similar textural change within clay sediments is commonly known in case of the normal consolidation series in the ordinary deep sea (Kawamura and Ogawa, 2004), but the scaly clay is dominant as sheared clay along the décollement zones in the accretionary prisms that characterize the plate subduction boundaries below the offscraped sediments above underplated oceanic sediments (Moore, 1989; Ogawa, 1993; Labaume et al., 1997; Bolton and Maltman, 1998; Bolton et al., 1998; Takizawa and Ogawa, 1999; Vannucchi et al., 2003). Using permeability controlling clay experiments, Bolton and Maltman (1998) and Bolton et al. (1998) explain the scaly clay textural change in accordance with the change of pore-fluid pressure and consolidation history under constant depth conditions as they apply to the samples from the décollement zone at the edge of the Barbados accretionary prism. As they explained, in one case after the first normal consolidation stage, when only the volume loss without strong shear, then the ductile flow occurs with shear under undrained condition, after that due to the resultant permeability reduction during consolidation with pore space loss, effective stress is reduced to suffer further shear with brittle overprint.