Guo, Junhua; Likos, William John; Underwood, Michael B.; Skarbek, Robert M.; Adamson, Nick; Saffer, Demian (2011): Consolidation characteristics of sediments from Sites C0002, C0006, and C0007, IODP expeditions 315 and 316, NanTroSEIZE Stage 1. IODP Management International, Washington, DC, United States, In: Kinoshita, Masataka, Tobin, Harold, Thu, Moe Kyaw, Gaillot, Philippe, Bourlange, Sylvain, Chang, Chondong, Conin, Marianne, Gulick, Sean, Jurado Rodriguez, Maria Jose, Martin, Kylara M., McNeill, Lisa, Miyakawa, Ayumu, Moore, J. Casey, Nakamura, Yasuyuki, Saito, Saneatsu, Sawyer, Dale S., Tudge, Joanne, Yamada, Yasuhiro, Ashi, Juichiro, Lallemant, Siegfried, Masago, Hideki, Behrmann, Jan H., Boeckel, Babette, Byrne, Timothy, Calves, Gerome, Famin, Vincent, Guo, Junhua, Hashimoto, Yoshitaka, Hayashi, Hiroki, Henry, Pierre, Hirono, Tetsuro, Hulme, Samuel M., Kaksonen, Anna Henriikka, Kanagawa, Kyuichi, Kanamatsu, Toshiya, Kopf, Achim, Lewis, Jonathan C., Likos, William John, Pares, Josep Maria, Saito, Hiroyuki, Schmidt-Schierhorn, Friederike, Tomaru, Hitoshi, Zhu, Wen-Lu, Kimura, Gaku, Screaton, Elizabeth J., Curewitz, Daniel, Chester, Frederick, Fabbri, Olivier, Fergusson, Chris, Girault, France E., Goldsby, David, Harris, Robert, Inagaki, Fumio, Jiang, Tao, Kitamura, Yujin, Knuth, Matt, Li Chunfeng, Liljedahl, Lillemor Claesson, Louis, Laurent, Milliken, Kitty, Nicholson, Uisdean, Riedinger, Natascha, Sakaguchi, Arito, Solomon, Evan, Strasser, Michael, Su Xin, Tsutsumi, Akito, Ujiie, Kohtaro, Yamaguchi, Asuka, Zhao, Xixi, Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 1; investigations of seismogenesis, Nankai Trough, Japan; Expeditions 314, 315, and 316 of the riser drilling platform from and to Shingu, Japan; Sites C0001-C0006, 21 September-15 November 2007; and Sites C0001 and C0002, 16 November-18 December 2007; and Sites C0004 and C0006-C0008; 19 December 2007-5 February 2008, 314/315/316, georefid:2011-100711

Abstract:

Eighteen constant-rate-of-strain consolidation tests were performed on whole-round core samples from Integrated Ocean Drilling Program Sites C0002, C0006, and C0007. These sites are located along the Kumano transect of the Nankai Trough offshore south-central Japan; Site C0002 is in the forearc basin and the other two are in the frontal thrust zone. Sample depths range from approximately 35 to 920 m core depth below seafloor. The objectives of the laboratory tests were to obtain the compression characteristics of the sediments, to estimate the maximum pretest consolidation stress (P' (sub c) ), and to determine values of hydraulic conductivity (K), intrinsic permeability (k), and compression index (Cc). Values of C (sub c) at Site C0002 range from 0.391 to 0.780 (average = 0.584); comparable values are 0.236 to 0.418 (average = 0.302) in the trench-wedge facies at Sites C0006 and C0007. Values of in situ intrinsic permeability (ki) at Site C0002 show no trend with depth, ranging from 2.67X10 (super -17) m (super 2) to 2.56X10 (super -18) m (super 2) . Estimates of k (sub i) at Sites C0006 and C0007 decrease with depth and range from 1.85X10 (super -16) m (super 2) to 6.08X10 (super -18) m (super 2) . Test-derived values of P' (sub c) are consistently greater than the estimates of in situ hydrostatic vertical effective stress at equivalent sample depths, which means the specimens are overconsolidated. Environmental scanning electron microscopy was used to assess the degree of preferred particle orientation of the microfabric. The index of orientation averages 0.33 at Sites C0006 and C0007 and 0.38 at Site C0002. Most vertical sections show indexes of orientation greater than those for horizontal sections; exceptions to this pattern include several samples from Sites C0006 and C0007 where bedding dips >40 degrees . Samples from deeper intervals of the forearc basin (Site C0002) and from the accreted upper Shikoku Basin facies at Site C0007 yielded the highest values of orientation index (>0.40), indicating better alignment of platy grains.

Coverage:

West: 136.3800 East: 136.4800 North: 33.1800 South: 33.0100

Relations:

Expedition: 314

Site: 314-C0002

Site: 314-C0006

Expedition: 315

Site: 315-C0002

Expedition: 316

Site: 316-C0006

Site: 316-C0007

Expedition: 326