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Sedimentology, structural geology, and tectonics of the Shikoku subduction zone, southwestern Japan

1976; Geological Society of America; Volume: 87; Issue: 9 Linguagem: Inglês

10.1130/0016-7606(1976)87 2.0.co;2

1943-2674

J. Casey Moore, Daniel E. Karig,

earthquake and tectonic studies

Research Article| September 01, 1976 Sedimentology, structural geology, and tectonics of the Shikoku subduction zone, southwestern Japan J. CASEY MOORE; J. CASEY MOORE 1Earth Sciences, University of California, Santa Cruz, Santa Cruz, California 95064 Search for other works by this author on: GSW Google Scholar DANIEL E. KARIG DANIEL E. KARIG 2Department of Geological Sciences, Cornell University, Ithaca, New York 14850 Search for other works by this author on: GSW Google Scholar Author and Article Information J. CASEY MOORE 1Earth Sciences, University of California, Santa Cruz, Santa Cruz, California 95064 DANIEL E. KARIG 2Department of Geological Sciences, Cornell University, Ithaca, New York 14850 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1976) 87 (9): 1259–1268. https://doi.org/10.1130/0016-7606(1976)87 2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation J. CASEY MOORE, DANIEL E. KARIG; Sedimentology, structural geology, and tectonics of the Shikoku subduction zone, southwestern Japan. GSA Bulletin 1976;; 87 (9): 1259–1268. doi: https://doi.org/10.1130/0016-7606(1976)87 2.0.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 SocietyGSA Bulletin Search Advanced Search Abstract The Shikoku subduction zone is developed along the Nankai Trough where the Philippine plate is underthrust beneath the Asian plate. The landward wall of the Nankai Trough consists of horizontal parallel ridges and basins that trend northeastward. A Deep Sea Drilling Project site (Leg 31, site 298) on the landward flank of the deepest ridge penetrated 525 m of beds in normal stratigraphic position and 86 m of overturned beds (all of Quaternary age), indicating an overturned anticline. The tight, overturned anticline, which trends parallel to the Nankai Trough, has an inter-limb angle of 9°, an axial surface inclined 9° to 14° landward, and a convergently fanning axial plane fracture cleavage. A coarsening-upward turbidite sequence defines a trench facies and demonstrates direct accretion of deposits from this environment.The convergence rate in the Shikoku subduction zone is estimated to be from 1 to 2 cm/yr, with a strain rate of about 10−13/sec. Tectonic consolidation has reduced the volume of the subducted and accreted rocks at least one-third. Olistrostromes form as a direct consequence of fold evolution in the submarine environment and can be immediately underthrust, thereby developing a structural fabric. 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.