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Intraoceanic unroofing of eclogite facies rocks in the Omachi Seamount, Izu-Bonin frontal arc

2004; Geological Society of America; Volume: 32; Issue: 10 Linguagem: Inglês

10.1130/g20837.1

1943-2682

Hayato Ueda, Tadashi Usuki, Yoshiyuki Kuramoto,

Geological and Geochemical Analysis

Research Article| October 01, 2004 Intraoceanic unroofing of eclogite facies rocks in the Omachi Seamount, Izu-Bonin frontal arc Hayato Ueda; Hayato Ueda 1Department of Geology, Faculty of Science, Niigata University, Niigata 950-2181, Japan Search for other works by this author on: GSW Google Scholar Tadashi Usuki; Tadashi Usuki 2Institute of Earth Sciences, Academia Sinica, Taipei 115, Taiwan Search for other works by this author on: GSW Google Scholar Yoshiyuki Kuramoto Yoshiyuki Kuramoto 3Division of Earth and Planetary Sciences, Hokkaido University, Sapporo 060-810, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Hayato Ueda 1Department of Geology, Faculty of Science, Niigata University, Niigata 950-2181, Japan Tadashi Usuki 2Institute of Earth Sciences, Academia Sinica, Taipei 115, Taiwan Yoshiyuki Kuramoto 3Division of Earth and Planetary Sciences, Hokkaido University, Sapporo 060-810, Japan Publisher: Geological Society of America Received: 21 May 2004 Revision Received: 07 Jul 2004 Accepted: 08 Jul 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (10): 849–852. https://doi.org/10.1130/G20837.1 Article history Received: 21 May 2004 Revision Received: 07 Jul 2004 Accepted: 08 Jul 2004 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 Hayato Ueda, Tadashi Usuki, Yoshiyuki Kuramoto; Intraoceanic unroofing of eclogite facies rocks in the Omachi Seamount, Izu-Bonin frontal arc. Geology 2004;; 32 (10): 849–852. doi: https://doi.org/10.1130/G20837.1 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 SocietyGeology Search Advanced Search Abstract Electron-microscope and electron-microprobe observations of amphibolites from the Omachi Seamount in the Izu-Bonin frontal arc show that they contain micrometer-sized inclusions of omphacite ± kyanite, indicating eclogite facies metamorphism. The garnet-zoisite amphibolite was subjected to metamorphic conditions of 600–700 °C and ∼2 GPa in the early stage of metamorphism. These metabasites were subducted to a depth of ∼70 km beneath the Izu-Bonin arc and were exhumed together with serpentinite schist. Their intraoceanic unroofing was probably induced by backarc extension of the upper plate, whose axes were intersected and cooled by the newly formed Izu-Bonin subduction system. This intraoceanic exhumation associated with suprasubduction extension can be a modern analogue for ancient on-land eclogite terranes accompanied by ophiolites. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.