Paleothermal structure of the Shimanto accretionary prism, Shikoku, Japan: Role of an out-of-sequence thrust

Research Article| April 01, 1997 Paleothermal structure of the Shimanto accretionary prism, Shikoku, Japan: Role of an out-of-sequence thrust Kotoe Ohmori; Kotoe Ohmori 1Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164, Japan Search for other works by this author on: GSW Google Scholar Asahiko Taira; Asahiko Taira 1Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164, Japan Search for other works by this author on: GSW Google Scholar Hidekazu Tokuyama; Hidekazu Tokuyama 1Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164, Japan Search for other works by this author on: GSW Google Scholar Arito Sakaguchi; Arito Sakaguchi 2Institute of Geoscience, Tsukuba University, 1-1-1 Tennodai, Tsukuba, Ibaragi 305, Japan Search for other works by this author on: GSW Google Scholar Makoto Okamura; Makoto Okamura 3Department of Geology, Faculty of Sciences, Kochi University, 2-5-1 Akebono-cho, Kochi, Kochi 780, Japan Search for other works by this author on: GSW Google Scholar Atsuo Aihara Atsuo Aihara 4Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, 33 Hakozaki, Fukuoka 812, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Kotoe Ohmori 1Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164, Japan Asahiko Taira 1Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164, Japan Hidekazu Tokuyama 1Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164, Japan Arito Sakaguchi 2Institute of Geoscience, Tsukuba University, 1-1-1 Tennodai, Tsukuba, Ibaragi 305, Japan Makoto Okamura 3Department of Geology, Faculty of Sciences, Kochi University, 2-5-1 Akebono-cho, Kochi, Kochi 780, Japan Atsuo Aihara 4Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, 33 Hakozaki, Fukuoka 812, Japan Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1997) 25 (4): 327–330. https://doi.org/10.1130/0091-7613(1997)025<0327:PSOTSA>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Kotoe Ohmori, Asahiko Taira, Hidekazu Tokuyama, Arito Sakaguchi, Makoto Okamura, Atsuo Aihara; Paleothermal structure of the Shimanto accretionary prism, Shikoku, Japan: Role of an out-of-sequence thrust. Geology 1997;; 25 (4): 327–330. doi: https://doi.org/10.1130/0091-7613(1997)025<0327:PSOTSA>2.3.CO;2 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 SocietyGeology Search Advanced Search Abstract Vitrinite reflectance study on the Cretaceous Shimanto accretionary prism of Southwest Japan shows that the vitrinite reflectance varies from 0.6% to 3.0%, corresponding to the estimated maximum paleotemperature variation of 90–210 °C. The thermal structure shows a sharp discontinuity across an out-of-sequence thrust separating it into two thermal blocks. In each block, vitrinite reflectance values increase systematically toward the prism younging direction, and the thermal structure is clearly overprinted on the tectonic imbrication of turbidite and melange units. This provided us with a set of data to calculate the geometry and displacement of the out-of-sequence thrust. The fission-track zircon partial-annealing ages indicate that this thrust was active about 43 Ma, probably in response to the accretion of Eocene rocks. This study shows that initial thickening of the accretionary prism, in an order of several kilometres, was mainly controlled by out-of-sequence thrust. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.