Title: Structural architecture and active deformation of the Nankai Accretionary Prism, Japan: Submersible survey results from the Tenryu Submarine Canyon
Abstract: Research Article| November 01, 2009 Structural architecture and active deformation of the Nankai Accretionary Prism, Japan: Submersible survey results from the Tenryu Submarine Canyon Kiichiro Kawamura; Kiichiro Kawamura † 1Fukada Geological Institute, 2-13-12 Honkomagome, Bunkyo, Tokyo 113-0021, Japan †E-mail: [email protected] Search for other works by this author on: GSW Google Scholar Yujiro Ogawa; Yujiro Ogawa § 2Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8572, Japan §E-mail: [email protected] Search for other works by this author on: GSW Google Scholar Ryo Anma; Ryo Anma 2Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8572, Japan Search for other works by this author on: GSW Google Scholar Shunji Yokoyama; Shunji Yokoyama 3Kochi University, 2-5-1 Akebonocho, Kochi 780-8520, Japan Search for other works by this author on: GSW Google Scholar Shunsuke Kawakami; Shunsuke Kawakami 4Geological Survey of Japan, Tsukuba Central 7, 1-1, Higashi 1-Chome, Tsukuba 305-8567, Japan #Present address: Earth Appraisal Company, F&F Royal Building 4F, 2-4-6 Kandaawajicho, Chiyoda, Tokyo, 101-0063, Japan Search for other works by this author on: GSW Google Scholar Yildirim Dilek; Yildirim Dilek 5Miami University, 116 Shideler Hall, Oxford, Ohio 45056, USA Search for other works by this author on: GSW Google Scholar Gregory F. Moore; Gregory F. Moore 6School of Ocean and Earth Science and Technology (SOEST), University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA Search for other works by this author on: GSW Google Scholar Satoshi Hirano; Satoshi Hirano 7IFREE4, Japan Marine-Earth Science and Technology Center, 2-15, Natsushimacho, Yokosuka, 237-0061, Japan *Present address: Marine Works Japan, c/o Kochi Core Center, B200, Monobe, Nangoku 783-8502, Kochi, Japan Search for other works by this author on: GSW Google Scholar Asuka Yamaguchi; Asuka Yamaguchi 8University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan Search for other works by this author on: GSW Google Scholar Tomoyuki Sasaki; Tomoyuki Sasaki 8University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan Search for other works by this author on: GSW Google Scholar YK05-08 Leg 2; YK05-08 Leg 2 Search for other works by this author on: GSW Google Scholar YK06-02 Shipboard Scientific Parties YK06-02 Shipboard Scientific Parties Search for other works by this author on: GSW Google Scholar GSA Bulletin (2009) 121 (11-12): 1629–1646. https://doi.org/10.1130/B26219.1 Article history received: 10 Mar 2007 rev-recd: 12 Feb 2008 accepted: 13 Mar 2008 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Kiichiro Kawamura, Yujiro Ogawa, Ryo Anma, Shunji Yokoyama, Shunsuke Kawakami, Yildirim Dilek, Gregory F. Moore, Satoshi Hirano, Asuka Yamaguchi, Tomoyuki Sasaki, YK05-08 Leg 2, YK06-02 Shipboard Scientific Parties; Structural architecture and active deformation of the Nankai Accretionary Prism, Japan: Submersible survey results from the Tenryu Submarine Canyon. GSA Bulletin 2009;; 121 (11-12): 1629–1646. doi: https://doi.org/10.1130/B26219.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Two research cruises that deployed submersible surveys were undertaken along the Tenryu Submarine Canyon to directly observe the structural architecture of the eastern Nankai Accretionary Prism off the coast of southern Japan. The surveys have demonstrated that the accreted sediments are strongly deformed turbidite sequences that occur in repeated thrust-anticline structures. From the leading edge of the prism near the trench toward the arc, the following deformation zones have been identified within the prism: Frontal Thrust zone, Prism Toe zone, Imbricate Thrust zone, and Tokai Thrust zone (or out-of-sequence thrust or OOST zone). The Frontal Thrust zone is characterized by debris deposits within the hanging wall that have an age of 0–0.43 Ma, as determined from radiolarian biostratigraphy. The Prism Toe zone is characterized by unconsolidated turbidite sequences that are 1.98–3.4 Ma; these sequences are cut by normal and thrust faults. The Imbricate Thrust zone includes consolidated muddy layers and unconsolidated sandy layers that contain numerous fracture cleavages. The OOST zone consists of highly deformed consolidated sediments, ranging in age from 0.18 to 1.03 Ma. From the Prism Toe zone to the Imbricate Thrust zone, the uniaxial compressive strength increases gradually from 0.5–3.0 to 1.0–6.0 MPa, while the anisotropy of magnetic susceptibility changes from oblate to prolate shapes, and porosity decreases from 40%–50% to 30%–50%. These data indicate that the eastern Nankai Accretionary Prism appears to have been deformed toward the Imbricate Thrust zone just south of the OOST. Stable isotope analyses of calcite veins and calcite cement of the sandstone samples from the Tokai Thrust zone have shown that fluid temperatures for calcite precipitation were 24–63 °C in the OOST zone. The occurrence of highly deformed and consolidated rocks within the Nankai Accretionary Prism likely resulted from tectonic transportation of deeply buried rocks along major out-of-sequence thrust faults, such as the Tokai OOST. We infer therefore that out-of-sequence thrust faults play a major role in transporting deeply buried, deformed rocks in accretionary prisms to the shallower depths and even to the seafloor during ongoing subduction. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 2009
Publication Date: 2009-08-28
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 52
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