En echelon patterns of Calyptogena colonies in the Japan Trench

Abstract

Research Article| September 01, 1996 En echelon patterns of Calyptogena colonies in the Japan Trench Yujiro Ogawa; Yujiro Ogawa 1Institute of Geoscience, University of Tsukuba, Tsukuba 305, Japan Search for other works by this author on: GSW Google Scholar Kantaro Fujioka; Kantaro Fujioka 2Japan Marine Science and Technology Center, Yokosuka 237, Japan Search for other works by this author on: GSW Google Scholar Katsunori Fujikura; Katsunori Fujikura 2Japan Marine Science and Technology Center, Yokosuka 237, Japan Search for other works by this author on: GSW Google Scholar Yo Iwabuchi Yo Iwabuchi 3Hydrographic Department, Maritime Safety Agency of Japan, Tsukiji, Tokyo 104, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Yujiro Ogawa 1Institute of Geoscience, University of Tsukuba, Tsukuba 305, Japan Kantaro Fujioka 2Japan Marine Science and Technology Center, Yokosuka 237, Japan Katsunori Fujikura 2Japan Marine Science and Technology Center, Yokosuka 237, Japan Yo Iwabuchi 3Hydrographic Department, Maritime Safety Agency of Japan, Tsukiji, Tokyo 104, Japan Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1996) 24 (9): 807–810. https://doi.org/10.1130/0091-7613(1996)024<0807:EEPOCC>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 Email Permissions Search Site Citation Yujiro Ogawa, Kantaro Fujioka, Katsunori Fujikura, Yo Iwabuchi; En echelon patterns of Calyptogena colonies in the Japan Trench. Geology 1996;; 24 (9): 807–810. doi: https://doi.org/10.1130/0091-7613(1996)024<0807:EEPOCC>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 The distribution of Calyptogena phaseoliformis colonies in right-stepping en echelon patterns was observed by the Japanese submersible Shinkai 6500 at the foot of the landward escarpment of the northern Japan Trench at around 6437–6274 m depth. The north-south–trending Sanriku Escarpment has a thrust origin and is subparallel to the trench axis along which the Pacific plate is being subducted beneath the North America or Okhotsk plate at about 300° at a rate of about 7.8 to 8.3 cm/yr. The trends of colonies are concentrated at 250°, 300°, and 330°: each trend matches either an antithetic riedel shear, extension fracture, or synthetic riedel shear, respectively, within a left-lateral shear regime caused by the oblique subduction. Methane- and hydrogen sulfide–bearing fluid advection from depth occurs essentially along the thrust fault, but finally seeps along the fractures at the sea floor. This supplies energy to the food chain through bacteria utilizing hydrogen sulfide, then eventually sustains the Calyptogena colonies. Because the clams select the best places to survive, the geometric arrangement of the clam colonies provides a kinematic indicator of relative plate motions. 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.