Clay mineral assemblages in the Shikoku Basin, NanTroSEIZE subduction inputs, IODP Sites C0011 and C0012

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doi: 10.2204/iodp.proc.322.202.2013
Author(s): Underwood, Michael B.; Guo, Junhua
Integrated Ocean Drlling Program, Expedition 322 Scientists, College Station, TX
Author Affiliation(s): Primary:
University of Missouri, Department of Geological Sciences, Columbia, MO, United States
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
Osaka University, Japan
University of Bremen, Germany
Pennsylvania State University, United States
University of Kiel, Germany
University Joseph Fourier, France
University of Melbourne, Australia
Chiba University, Japan
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 at 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 Drlling Program, Expedition 322 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program (Online), Vol.322, 34p. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014
Note: In English. 44 refs.; illus., incl. sect., 5 tables, sketch map
Summary: This report documents clay mineral assemblages outboard of the Nankai Trough at two sites in the Shikoku Basin. The sites make up part of the Kumano transect, offshore south-central Japan. Coring began during Integrated Ocean Drilling Program (IODP) Expedition 322, as part of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE). IODP Site C0011 is located on the northwest flank of Kashinosaki Knoll, and IODP Site C0012 is located on the summit of the seamount. A total of 292 samples of hemipelagic mud and mudstone were analyzed by X-ray diffraction, using oriented aggregates of the clay-size fraction (<2 µm). Smectite varies the most among the clay-size constituents, ranging in abundance from 35% to 100% (where smectite + illite + chlorite + kaolinite + quartz = 100%). Specimens with smectite contents of 80% or more are classified as bentonites, and we identified 44 such samples. The estimated amount of smectite in bulk mudstone ranges from 24% to 87% (where total clay minerals + quartz + feldspar + calcite = 100%), and a substantial number of bulk samples contain >45% smectite. On average, the expandability of illite/smectite mixed-layer clay is equal to 77%, and the average proportion of illite in illite/smectite is 11%. There is no systematic progression of clay mineral diagenesis over the depths sampled. Most values of illite crystallinity index are consistent with a detrital source that contains sedimentary rocks that were exposed to anchizone conditions of incipient metamorphism. The smectite-rich clay mineral assemblage is typical of early to middle Miocene deposits within the lower part of the Shikoku Basin.
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Cenozoic; Chemical composition; Chlorite; Chlorite group; Clastic rocks; Clastic sediments; Clay minerals; Cores; Crystallinity; Framework silicates; IODP Site C0011; IODP Site C0012; Illite; Integrated Ocean Drilling Program; Kaolinite; Lithostratigraphy; Marine sediments; Mineral assemblages; Mineral composition; Mud; Mudstone; NanTroSEIZE; North Pacific; Northwest Pacific; Pacific Ocean; Quartz; Sedimentary rocks; Sediments; Sheet silicates; Shikoku Basin; Silica minerals; Silicates; Smectite; Tertiary; West Pacific; X-ray diffraction data
Coordinates: N324944 N324945 E1365256 E1365254
N324453 N324453 E1365501 E1365501
Record ID: 2013046163
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