Strong sediments at the deformation front, and weak sediments at the rear of the Nankai accretionary prism, revealed by triaxial deformation experiments

DOI DOI Web Site Web Site 被引用文献3件 参考文献75件 オープンアクセス
  • Michael Stipp
    Department of Marine Geodynamics GEOMAR Helmholtz Centre for Ocean Research Kiel Kiel Germany
  • Malte Rolfs
    Institute of Geotechnical Engineering and Construction Management TU Hamburg‐Harburg Hamburg Germany
  • Yujin Kitamura
    Department of Earth and Planetary Science University of Tokyo Tokyo Japan
  • Jan H. Behrmann
    Department of Marine Geodynamics GEOMAR Helmholtz Centre for Ocean Research Kiel Kiel Germany
  • Kai Schumann
    Department of Marine Geodynamics GEOMAR Helmholtz Centre for Ocean Research Kiel Kiel Germany
  • Detlef Schulte‐Kortnack
    Department of Engineering Geology Institute of Geosciences University of Kiel Kiel Germany
  • Volker Feeser
    Department of Engineering Geology Institute of Geosciences University of Kiel Kiel Germany

書誌事項

公開日
2013-11
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/ggge.20290
  • 10.1002/2013gc004987
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Nineteen whole‐round core samples from the Nankai accretionary prism (IODP Expeditions 315, 316, and 333) from a depth range of 28–128 m below sea floor were experimentally deformed in a triaxial cell under consolidated and undrained conditions at confining pressures of 400–1000 kPa, room temperature, axial displacement rates of 0.01–9.0 mm/min, and up to axially compressive strains of ∼64%. Despite great similarities in composition and grain size distribution of the silty clay samples, two distinct “rheological groups” are distinguished: The first group shows deviatoric peak stress after only a few percent of compressional strain (<10%) and a continuous stress decrease after peak conditions. Simultaneous to this decrease is a pore pressure increase indicating contractant behavior characteristic of structurally weak material. The second sample group weakens only moderately at a much higher strength level after significantly higher strain (>10%), or does not weaken at all. This is characteristic of structurally strong material. The strong samples tend to be overconsolidated and are all from the drillsites at the accretionary prism toe, while the weak and normally consolidated samples come from the immediate hanging wall of a megasplay fault further upslope. Sediments from the incoming plate are also structurally weak. The observed differences in mechanical behavior may hold a key for understanding strain localization and brittle faulting within the uniform silty and clayey sedimentary sequence of the Nankai accretionary prism.</jats:p>

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