Tectonic erosion in a Pacific-type orogen: Detrital zircon response to Cretaceous tectonics in Japan

Research Article| December 01, 2012 Tectonic erosion in a Pacific-type orogen: Detrital zircon response to Cretaceous tectonics in Japan Kazumasa Aoki; Kazumasa Aoki * 1Department of Earth Science and Astronomy, University of Tokyo, Tokyo 153-8902, Japan *E-mail: kazumasa@ea.c.u-tokyo.ac.jp. Search for other works by this author on: GSW Google Scholar Yukio Isozaki; Yukio Isozaki 1Department of Earth Science and Astronomy, University of Tokyo, Tokyo 153-8902, Japan2Département des Sciences de la Terre, Université Lille 1 (UMR 8217 Géosystèmes CNRS–Lille 1), 59655 Villeneuve d'Ascq, France Search for other works by this author on: GSW Google Scholar Shinji Yamamoto; Shinji Yamamoto 1Department of Earth Science and Astronomy, University of Tokyo, Tokyo 153-8902, Japan Search for other works by this author on: GSW Google Scholar Kenshi Maki; Kenshi Maki 3Department of Geology and Mineralogy, Kyoto University, Kyoto 606-8502, Japan Search for other works by this author on: GSW Google Scholar Takaomi Yokoyama; Takaomi Yokoyama 3Department of Geology and Mineralogy, Kyoto University, Kyoto 606-8502, Japan Search for other works by this author on: GSW Google Scholar Takafumi Hirata Takafumi Hirata 3Department of Geology and Mineralogy, Kyoto University, Kyoto 606-8502, Japan Search for other works by this author on: GSW Google Scholar Geology (2012) 40 (12): 1087–1090. https://doi.org/10.1130/G33414.1 Article history received: 15 Mar 2012 rev-recd: 10 May 2012 accepted: 20 May 2012 first online: 09 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 Kazumasa Aoki, Yukio Isozaki, Shinji Yamamoto, Kenshi Maki, Takaomi Yokoyama, Takafumi Hirata; Tectonic erosion in a Pacific-type orogen: Detrital zircon response to Cretaceous tectonics in Japan. Geology 2012;; 40 (12): 1087–1090. doi: https://doi.org/10.1130/G33414.1 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 U-Pb dating of detrital zircons from the Lower Cretaceous Sanbagawa and the recently recognized Upper Cretaceous Shimanto high-pressure (HP) metamorphic rocks in southwestern Japan has revealed the presence of abundant Proterozoic (ca. 1500–2000 Ma) detrital grains. In contrast, coeval non- to weakly metamorphosed accretionary complex (AC) and forearc basin sediments in southwestern Japan lack these older signatures. The only possible source of the Proterozoic detrital grains is the Jurassic AC in southwestern Japan, which structurally overlies the Cretaceous HP units. The Proterozoic grains were incorporated into the protoliths of HP-ACs, without polluting coeval forearc basin to trench sediments, likely by tectonic erosion in the forearc domain. Along the Cretaceous Wadati-Benioff plane, the tectonic erosion peeled off the sole part of the pre-existing forearc crust and mixed it with the subducting trench sediments prior to the peak HP metamorphism. In the Cretaceous subduction-related margin around Japan, the tectonic erosion likely occurred twice. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.