Integrated Ocean Drilling Program Expedition 316 preliminary report; NanTroSEIZE Stage 1A; NanTroSEIZE shallow megasplay and frontal thrust; 19 December 2007-5 February 2008

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doi: 10.2204/iodp.pr.316.2008
Author(s): 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; Xin Su; Tsutsumi, Akito; Ujiie, Kohtaro; Yamaguchi, Asuka; Zhao, Xixi
Integrated Ocean Drilling Program, Expedition 316 Scientists, College Station, TX
Author Affiliation(s): Primary:
University of Tokyo, Department of Earth and Planetary Science, Tokyo, Japan
Other:
University of Florida, United States
Japan Agency for Marine-Earth Science and Technology, Japan
Texas A&M University, United States
University of Franche-Comte, France
University of Wollongong, Australia
ETH Zürich, Switzerland
Brown University, United States
Oregon State University, United States
Leibniz Institute of Marine Sciences, Federal Republic of Germany
University of Wisconsin-Madison, United States
Tongji University, China
Stockholm University, Sweden
Université de Cergy-Pontoise, France
University of Texas at Austin, United States
University of Abderdeen, United Kingdom
Max Planck Institute for Marine Microbiology, Federal Republic of Germany
Scripps Institution of Oceanography, United States
University of Bremen, Federal Republic of Germany
Kyoto University, Japan
University of California-Santa Cruz, United States
Source: Preliminary Report (Integrated Ocean Drilling Program), Vol.316, 59p. Publisher: IODP Management International, College Station, TX, United States. ISSN: 1932-9423
Note: In English. 43 refs.
Summary: Integrated Ocean Drilling Program (IODP) Expedition 316 is part of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) complex drilling project (CDP). This coordinated, multiplatform, and multiexpedition drilling project is designed to investigate fault mechanics and seismogenesis along subduction megathrusts through direct sampling, in situ measurements, and long-term monitoring in conjunction with allied laboratory and numerical modeling studies. Expedition 316 was designed to evaluate the deformation, inferred depth of detachment, structural partitioning, fault zone physical characteristics, and fluid flow at the frontal thrust and at the shallow portion of the megasplay system. To accomplish these objectives, drilling was conducted at two sites in the megasplay region, one within the fault zone and one in the slope basin seaward of the megasplay. Two sites were also drilled within the frontal thrust region. During Expedition 314, two of these sites were characterized using logging while drilling. Site C0004 is located along the slope of the accretionary prism landward of the inferred intersection of the megasplay fault zone with the seafloor. Drilling at this site examined the youngest sediments on the slope overlying the accretionary prism; these sediments consist of slowly deposited marine sediments and redeposited material from upslope. This redeposited material provides information about past slope failures, which may be related to past megasplay movement, earthquakes, and tsunamigenesis. The accretionary prism was sampled and the megasplay fault zone was successfully drilled. Structural observations of core material from the fault zone and two age reversals suggested by nannofossils indicate a complex history of deformation. The sediments under the fault zone were sampled to understand their deformation, consolidation, and fluid flow history. Drilling at Site C0008 targeted the slope basin seaward of the megasplay fault. This basin records the history of fault movement. In addition, sediment layers within this basin provide a reference for sediment underthrusting Site C0004. Drilling at Sites C0006 and C0007 allowed examination of the frontal thrust region. At Site C0006, several fault zones within the prism were penetrated before drilling was stopped because of poor conditions. The plate boundary frontal thrust was successfully drilled and thrust fault material ranging from breccia to fault gouge was successfully recovered at Site C0007.
Year of Publication: 2008
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; 20 Geophysics, Applied; Accretionary wedges; Asia; Boreholes; Continental margin; Cores; Deformation; Drilling; Earthquakes; Expedition 316; Far East; Faults; Geophysical methods; Geophysical profiles; Geophysical surveys; Honshu; IODP Site C0004; IODP Site C0006; IODP Site C0007; IODP Site C0008; Integrated Ocean Drilling Program; Japan; Kii Peninsula; Kumano Basin; Magnetic properties; Magnetic susceptibility; Magnetostratigraphy; Marine drilling; Marine sediments; NanTroSEIZE; Nankai Trough; Nankai Trough Seismogenic Zone Experiment; North Pacific; Northwest Pacific; Pacific Ocean; Paleomagnetism; Physical properties; Plate boundaries; Plate tectonics; Sediments; Seismic methods; Seismic profiles; Seismicity; Subduction zones; Surveys; Thrust faults; Tonankai earthquake 1944; Vertical seismic profiles; Well logs; West Pacific
Coordinates: N331300 N331300 E1364300 E1364300
N330100 N330200 E1364800 E1364800
N330114 N330119 E1364757 E1364753
N331244 N331249 E1364340 E1364336
Record ID: 2009098238
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