Consolidation properties of silty claystones and sandstones sampled seaward of the Nankai Trough subduction zone, IODP Sites C0011 and C0012

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doi: 10.2204/iodp.proc.322.203.2012
Author(s): Hüpers, Andre; Kopf, Achim J.
Integrated Ocean Drilling Program, Expedition 322 Scientists, College Station, TX
Author Affiliation(s): Primary:
University Bremen, MARUM-Center for Marine Environmental Sciences, Bremen, Germany
Japan Agency for Marine-Earth Science and Technology, Japan
Tohoku University, Japan
Université de Toulouse, France
Rice University, United States
National Centre for Antarctic and Ocean Research, India
University of Bremen, Germany
Pennsylvania State University, United States
University of Kiel, Germany
University Joseph Fourier, France
University of Melbourne, Australia
Chiba University, Japan
AIST/Geological Survey of Japan, Japan
University of Tokyo, Japan
University College London, United Kingdom
Boston University, United States
Lamont-Doherty Earth Observatory, United States
New Mexico Institute of Mining and Technology, United States
Oregon State University, United States
University of Leicester, United Kingdom
China University of Geosciences, China
Doshisha University, Japan
University of California-Santa Cruz, United States
Volume Title: Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 2; subduction inputs; Expedition 322 of the riser drilling platform; Yokkaichi, Japan, to Shingu, Japan; Sites C0011 and C0012, 1 September-10 October 2009
Volume Author(s): Underwood, Michael B.; Saito, Saneatsu; Kubo, Yu'suke; Sanada, Yoshinori; Chiyonobu, Shun; Destrigneville, Christine; Dugan, Brandon; Govil, Pawan; Hamada, Yohei; Heuer, Verena; Hüpers, Andre; Ikari, Matt; Kitamura, Yujin; Kutterolf, Steffen; Labanieh, Shasa; Moreau, John; Naruse, Hajime; Oda, Hirokuni; Park, Jin-Oh; Pickering, Kevin T.; Scudder, Rachel; Slagle, Angela; Spinelli, Glenn; Torres, Marta; Tudge, Joanne; Wu Huaichun; Yamamoto, Tomohiro; Yamamoto, Yuzuru; Zhao, Xixi
Source: Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 2; subduction inputs; Expedition 322 of the riser drilling platform; Yokkaichi, Japan, to Shingu, Japan; Sites C0011 and C0012, 1 September-10 October 2009, Michael B. Underwood, Saneatsu Saito, Yu'suke Kubo, Yoshinori Sanada, Shun Chiyonobu, Christine Destrigneville, Brandon Dugan, Pawan Govil, Yohei Hamada, Verena Heuer, Andre Hüpers, Matt Ikari, Yujin Kitamura, Steffen Kutterolf, Shasa Labanieh, John Moreau, Hajime Naruse, Hirokuni Oda, Jin-Oh Park, Kevin T. Pickering, Rachel Scudder, Angela Slagle, Glenn Spinelli, Marta Torres, Joanne Tudge, Wu Huaichun, Tomohiro Yamamoto, Yuzuru Yamamoto and Xixi Zhao; Integrated Ocean Drilling Program, Expedition 322 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program (Online), Vol.322, 23p. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014
Note: In English. 14 refs.; illus., incl. 5 tables, sketch map
Summary: We conducted incremental loading and constant rate of strain consolidation tests on sediments recovered during Integrated Ocean Drilling Program (IODP) Expedition 322 from Sites C0011 and C0012, located seaward of the deformation front in the Nankai Trough subduction zone, southeast Japan. In total, five silty claystones and six sandstone samples from lithologic Units II-V were tested. The results document higher compressibilities for clay-rich specimens with compression indexes of Cc=0.4829-0.6905, whereas sandstones are characterized by values of Cc=0.2257-0.4357. Maximum past effective stresses of silty claystones from Units II and III suggest a normal to slightly overconsolidated state. Samples from Units IV and V are significantly overconsolidated with overconsolidation ratios of 2.06-2.51. Vertical effective stresses of ∼10 MPa are needed to force yielding nonvolcanic sandstones. These yield stresses are significantly higher than the calculated value of in situ hydrostatic vertical effective stresses. In contrast, volcanic sandstones yield at stresses close to the in situ hydrostatic effective stress. For all tested specimens, the logarithm of hydraulic conductivity K shows a linear relationship with void ratio, with sandstones exhibiting higher K values. Calculated in situ intrinsic permeabilities for silty claystones decrease with depth from 1.8×10-17 m2 at 377.81 m core depth below seafloor (CSF) to 8.5×10-20 m2 at 749.38 m CSF. In situ intrinsic permeabilities of sandstones do not show a clear trend but scatter between values of 1.3×10-15 and 4.0×10-17 m2.
Year of Publication: 2012
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 30 Engineering Geology; Asia; Boreholes; Clastic rocks; Claystone; Compressibility; Consolidation; Consolidometer tests; Cores; Expedition 322; Experimental studies; Far East; Honshu; Hydraulic conductivity; IODP Site C0011; IODP Site C0012; Integrated Ocean Drilling Program; Japan; Kii Peninsula; Laboratory studies; Marine sediments; NanTroSEIZE; Nankai Trough; North Pacific; Northwest Pacific; Overconsolidated materials; Pacific Ocean; Permeability; Regression analysis; Rock mechanics; Sandstone; Sedimentary rocks; Sediments; Shikoku Basin; Statistical analysis; Stress; West Pacific
Coordinates: N324944 N324944 E1365254 E1365254
N324453 N324453 E1365501 E1365501
Record ID: 2012098508
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