New seismological constraints on growth of continental crust in the Izu-Bonin intra-oceanic arc

Abstract

Research Article| November 01, 2007 New seismological constraints on growth of continental crust in the Izu-Bonin intra-oceanic arc Shuichi Kodaira; Shuichi Kodaira 1Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Showa-machi 3173-25, Kanazawa-ku, Yokohama, Japan Search for other works by this author on: GSW Google Scholar Takeshi Sato; Takeshi Sato 1Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Showa-machi 3173-25, Kanazawa-ku, Yokohama, Japan Search for other works by this author on: GSW Google Scholar Narumi Takahashi; Narumi Takahashi 1Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Showa-machi 3173-25, Kanazawa-ku, Yokohama, Japan Search for other works by this author on: GSW Google Scholar Seiichi Miura; Seiichi Miura 1Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Showa-machi 3173-25, Kanazawa-ku, Yokohama, Japan Search for other works by this author on: GSW Google Scholar Yoshihiko Tamura; Yoshihiko Tamura 2Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Natsushima 2-15, Yokosuka, Japan Search for other works by this author on: GSW Google Scholar Yoshiyuki Tatsumi; Yoshiyuki Tatsumi 2Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Natsushima 2-15, Yokosuka, Japan Search for other works by this author on: GSW Google Scholar Yoshiyuki Kaneda Yoshiyuki Kaneda 2Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Natsushima 2-15, Yokosuka, Japan Search for other works by this author on: GSW Google Scholar Geology (2007) 35 (11): 1031–1034. https://doi.org/10.1130/G23901A.1 Article history received: 19 Mar 2007 rev-recd: 11 May 2007 accepted: 29 Jun 2007 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 Shuichi Kodaira, Takeshi Sato, Narumi Takahashi, Seiichi Miura, Yoshihiko Tamura, Yoshiyuki Tatsumi, Yoshiyuki Kaneda; New seismological constraints on growth of continental crust in the Izu-Bonin intra-oceanic arc. Geology 2007;; 35 (11): 1031–1034. doi: https://doi.org/10.1130/G23901A.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 The process by which continental crust has formed is not well understood, though such crust mostly forms at convergent plate margins today. It is thus imperative to study modern intra-oceanic arcs, such as those common in the western Pacific Ocean. New seismic studies along the representative Izu-Bonin intra-oceanic arc provide unique along-strike images of arc crust and uppermost mantle to complement earlier, cross-arc lithospheric profiles. These reveal two scales (1000–10 km scale) of variations, one at the scale of the Izu versus Bonin (thick versus thin) arc crust, the other at the intervolcano (∼50 km) scale. These images show that: (1) the bulk composition of the Izu-Bonin arc crust is more mafic than typical continental crust, (2) the middle crust with seismic velocities similar to continental crust is predominantly beneath basaltic arc volcanoes, (3) the bulk composition beneath basaltic volcanoes changes little at thick and thin arc segments, and (4) a process to return lower crustal components to the mantle, such as delamination, is required for an arc crust to evolve into continental crust. Continued thickening of the Izu-Bonin crust, accompanied by delamination of lowermost crust, can yield velocity structure of typical continental crust. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.