Expedition 348 summary

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doi: 10.2204/iodp.proc.348.101.2015
Author(s): Tobin, Harold; Hirose, Takehiro; Saffer, Demian M.; Toczko, Sean; Maeda, Lena; Kubo, Yusuke; Boston, Brian; Broderick, Aisling; Brown, Kevin; Crespo-Blanc, Ana; Even, Emilie; Fuchida, Shigeshi; Fukuchi, Rina; Hammerschmidt, Sebastian; Henry, Pierre; Josh, Matthew; Jurado, María José; Kitajima, Hiroko; Kitamura, Manami; Maia, Ana; Otsubo, Makoto; Sample, James; Schleicher, Anja; Sone, Hiroki; Song, Chen; Valdez, Robert; Yamamoto, Yuzuru; Yang, Kiho; Sanada, Yoshinori; Kido, Yukari; Hamada, Yohei
Integrated Ocean Drilling Program, Expedition 348 Scientists, College Station, TX
Author Affiliation(s): Primary:
University of Wisconsin-Madison, Department of Geoscience, Madison, WI, United States
Other:
Japan Agency for Marine-Earth Science and Technology, Japan
Pennsylvania State University, United States
University of Hawaii, United States
University of Birmingham, Ireland
Scripps Institution of Oceanography, United States
University of Granada, Spain
Osaka City University, Japan
University of Tokyo, Japan
University of Bremen, Germany
Aix-Marseille Université, France
CSIRO Earth Science and Resource Engineering, Australia
CSIC, Institute of Earth Sciences Jaume Almera, Spain
Geological Survey of Japan, Japan
Hiroshima University, Japan
Cardiff University, United Kingdom
Northern Arizona University, United States
University of Michigan, United States
German Research Centre for Geosciences-Potsdam, Germany
University of Missouri-Columbia, United States
Yonsei University, South Korea
Volume Title: Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 3; NanTroSEIZE plate boundary deep riser 3; Expedition 348 of the riser drilling platform from and to Shimizu, Japan; Site C0002, 13 September 2013-20 January 2014
Volume Author(s): Tobin, Harold; Hirose, Takehiro; Saffer, Demian M.; Toczko, Sean; Maeda, Lena; Kubo, Yusuke; Sanada, Yoshinori; Kido, Yukari; Hamada, Yohei; Boston, Brian; Broderick, Aisling; Brown, Kevin; Crespo-Blanc, Ana; Even, Emilie; Fuchida, Shigeshi; Fukuchi, Rina; Hammerschmidt, Sebastian; Henry, Pierre; Josh, Matthew; Jurado, María José; Kitajima, Hiroko; Kitamura, Manami; Maia, Ana; Otsubo, Makoto; Sample, James; Schleicher, Anja; Sone, Hiroki; Song, Chen; Valdez, Robert; Yamamoto, Yuzuru; Yang, Kiho
Source: Proceedings of the Integrated Ocean Drilling Program; NanTroSEIZE Stage 3; NanTroSEIZE plate boundary deep riser 3; Expedition 348 of the riser drilling platform from and to Shimizu, Japan; Site C0002, 13 September 2013-20 January 2014, Harold Tobin, Takehiro Hirose, Demian M. Saffer, Sean Toczko, Lena Maeda, Yusuke Kubo, Yoshinori Sanada, Yukari Kido, Yohei Hamada, Brian Boston, Aisling Broderick, Kevin Brown, Ana Crespo-Blanc, Emilie Even, Shigeshi Fuchida, Rina Fukuchi, Sebastian Hammerschmidt, Pierre Henry, Matthew Josh, María José Jurado, Hiroko Kitajima, Manami Kitamura, Ana Maia, Makoto Otsubo, James Sample, Anja Schleicher, Hiroki Sone, Chen Song, Robert Valdez, Yuzuru Yamamoto and Kiho Yang; Integrated Ocean Drilling Program, Expedition 348 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program (Online), Vol.348, 44p. Publisher: Integrated Ocean Drilling Program Management International for the Integrated Drilling Program (IODP), Washington, DC, United States. ISSN: 1930-1014 CODEN: IDSDA6
Note: In English. 49 refs.; illus., incl. sects., 5 tables, sketch map
Summary: The Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) is a multidisciplinary investigation of fault mechanics and seismogenesis along subduction megathrusts and includes reflection and refraction seismic imaging, direct sampling by drilling, in situ measurements, and long-term monitoring in conjunction with laboratory and numerical modeling studies. The fundamental objectives of NanTroSEIZE are to characterize the nature of fault slip and strain accumulation, fault and wall rock composition, fault architecture, and state variables throughout an active plate boundary system. As part of the NanTroSEIZE program, operations during Integrated Ocean Drilling Program (IODP) Expedition 348 were planned to extend and case riser Hole C0002F, begun during IODP Expedition 326 in 2010 and continued during Expedition 338 in 2012, from 860 to 3600 meters below the seafloor (mbsf). Riser operations during Expedition 348 were carried out and deepened the hole to 3058 mbsf, a new maximum depth record in scientific ocean drilling. Operations included installation and cementing of 13 3/8 inch casing to 2008.9 mbsf and an 11 3/4 inch liner to 2922.5 mbsf, stabilizing the borehole for future deepening. Reaching this depth required two sidetracking operations from the original Hole C0002F, resulting in the designation of Holes C0002N and C0002P for the successively deeper sidetracks. During drilling, a suite of logging-while-drilling (LWD) and measurement-while-drilling (MWD), mud-gas, and cuttings data were collected over the interval from 2162.5 to 3058.5 mbsf in Hole C0002P, and a partial suite was collected in Hole C0002N. The interval from 2163 to 2218 mbsf was cored with the rotary core barrel (RCB). Planned future riser drilling operations will deepen the hole to penetrate the plate boundary fault at ∼4600-5200 mbsf. Additionally, a test hole for a prototype slimhole small-diameter RCB (SD-RCB) coring system, Hole C0002M, was drilled in riserless mode near Hole C0002F. The hole was advanced to 475 mbsf, where four cores were collected to 512.5 mbsf. Overall, Expedition 348 sampled and logged a deep interval in Holes C0002N and C0002P within the inner accretionary wedge, from 856 to 3058.5 mbsf, including a never-before sampled zone in the lowermost ∼1 km of drilling. Cores were collected over a 55.5 m interval from 2163 to 2218.5 mbsf. The sampled sedimentary rocks are composed of hemipelagic sediment and fine turbidites with rare ash. The entire interval from ∼2145.5 to 2945.5 mbsf has an apparent depositional age of 9.56-10.73 Ma based on nannofossil first and last occurrence data. These ages are consistent with accretion of a middle Miocene section of either lower Shikoku Basin equivalent or Miocene-age trench fill; facies analysis suggests the former. Bedding attitudes were ubiquitously steep, measured at 60δ-90δ in both cores and resistivity image logs. A range of structural fabrics was sampled, including common development of scaly clay fabrics with polished and slickensided clayey surfaces at many depths throughout the drilled interval. Structural fabrics became progressively stronger with depth, and carbonate cement and veins became prevalent below 2100 mbsf. In the cored interval, a well-developed foliated fault zone was identified at 2204.9-2205.8 mbsf, with unknown overall displacement sense or amount. This zone contains abundant carbonate cement and vein fill.
Year of Publication: 2015
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Asia; Biostratigraphy; Boreholes; Cenozoic; Clastic rocks; Cores; Cuttings; Expedition 348; Far East; Faults; Honshu; IODP Site C0002; Integrated Ocean Drilling Program; Japan; Kii Peninsula; Kumano Basin; Lithostratigraphy; Magnetostratigraphy; Marine sediments; Microfossils; NanTroSEIZE; Nankai Trough; Nannofossils; Neogene; North Pacific; Northwest Pacific; Pacific Ocean; Paleomagnetism; Physical properties; Plantae; Plate boundaries; Pleistocene; Quaternary; Sedimentary rocks; Sediments; Subduction zones; Tertiary; Well logs; West Pacific
Coordinates: N331800 N331801 E1363801 E1363800
Record ID: 2015017327
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