IODP Expedition 333; return to Nankai Trough subduction inputs sites and coring of mass transport deposits

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doi: 10.2204/
Author(s): Henry, Pierre; Kanamatsu, Toshiya; Moe, Kyaw Thu; Strasser, Michael
Author Affiliation(s): Primary:
Aix-Marseille Université, Centre Européen de Recherche et d'Enseignement en Géosciences de l'Environement, Aix en Provence, France
Japan Agency for Marine-Earth Science and Technology, Japan
ETH Zürich, Switzerland
Volume Title: Scientific Drilling
Source: Scientific Drilling, Vol.14, p.4-17. Publisher: Integrated Ocean Drilling Program Management International, Sapporo; Washington, DC, International. ISSN: 1816-8957
Note: In English. 60 refs.; illus., incl. sects., sketch map
Summary: Integrated Ocean Drilling Program (IODP) Expedition 333 returned to two sites drilled during IODP Expedition 322 on the ocean side of the Nankai Trough to pursue the characterization of the inputs to the Nankai subduction and seismogenic zone, as part of the Nankai Trough Seismogenic Experiment (NanTroSEIZE) multi-expedition project. Site C0011 is located at the seaward edge of the trench and Site C0012 on a basement high, Kashinozaki Knoll (Fig. 1). The main objectives of drilling again at these sites were to fill coring gaps in the upper part (<350 m) of the sedimentary sequence, to measure heat flow, and to core the oceanic basement to a greater depth on the Knoll. New results include the observation of a diagenetic boundary within the Shikoku Basin sediments that may be compared to one documented further west by ODP Legs 131,190 and 196 but occurs here at a lower temperature. Borehole heat flow measurements confirm spatial variations in the Shikoku Basin that were indicated by short probe surveys. Heat flow variations between topographic highs and lows may be related to fluid convection within the basement. This expedition also included the objectives of the Nankai Trough Submarine LandSLIDE history (NanTroSLIDE) Ancillary Project Letter (APL) and cored at Site C0018 a pile of mass transport deposits on the footwall of the megasplay fault, a major out of sequence thrust that presumably slips coseismically during large subduction earthquakes. This brought new insight on the timing of these mass wasting events and on the deformation within the sliding slope sediments.
Year of Publication: 2012
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Asia; Basalts; Boreholes; Cenozoic; Chronostratigraphy; Continental margin; Convection; Cores; Diagenesis; Expedition 322; Expedition 333; Far East; Geophysical methods; Geophysical profiles; Geophysical surveys; Heat flow; Honshu; IODP Site C0011; IODP Site C0012; IODP Site C0018; Igneous rocks; Integrated Ocean Drilling Program; Japan; Lithostratigraphy; Magnetostratigraphy; Mass movements; NanTroSEIZE; North Pacific; Northwest Pacific; Pacific Ocean; Paleomagnetism; Porosity; Quaternary; Resistivity; Sedimentary rocks; Seismic methods; Seismic profiles; Shikoku Basin; Subduction zones; Surveys; Tephrochronology; Tertiary; Turbidite; Vertical seismic profiles; Volcanic rocks; West Pacific
Coordinates: N324944 N324944 E1365254 E1365254
N324453 N324453 E1365501 E1365501
N330925 N330925 E1364053 E1364053
Record ID: 2013017867
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