Enigmatic extinct spreading center in the West Philippine backarc basin unveiled

Abstract

Research Article| December 01, 1999 Enigmatic extinct spreading center in the West Philippine backarc basin unveiled Kantaro Fujioka; Kantaro Fujioka 1Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan Search for other works by this author on: GSW Google Scholar Kyoko Okino; Kyoko Okino 2Hydrographic Department of Japan, Tsukiji, Tokyo 104-0045, Japan Search for other works by this author on: GSW Google Scholar Toshiya Kanamatsu; Toshiya Kanamatsu 1Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan Search for other works by this author on: GSW Google Scholar Yasuhiko Ohara; Yasuhiko Ohara 2Hydrographic Department of Japan, Tsukiji, Tokyo 104-0045, Japan Search for other works by this author on: GSW Google Scholar Osamu Ishizuka; Osamu Ishizuka 3Geological Survey of Japan, Tsukuba, Ibaraki 305-8567, Japan Search for other works by this author on: GSW Google Scholar Saturu Haraguchi; Saturu Haraguchi 4Ocean Research Institute, University of Tokyo, Nakano, Tokyo 164-8639, Japan Search for other works by this author on: GSW Google Scholar Teruaki Ishii Teruaki Ishii 4Ocean Research Institute, University of Tokyo, Nakano, Tokyo 164-8639, Japan Search for other works by this author on: GSW Google Scholar Geology (1999) 27 (12): 1135–1138. https://doi.org/10.1130/0091-7613(1999)027<1135:EESCIT>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 MailTo Tools Icon Tools Get Permissions Search Site Citation Kantaro Fujioka, Kyoko Okino, Toshiya Kanamatsu, Yasuhiko Ohara, Osamu Ishizuka, Saturu Haraguchi, Teruaki Ishii; Enigmatic extinct spreading center in the West Philippine backarc basin unveiled. Geology 1999;; 27 (12): 1135–1138. doi: https://doi.org/10.1130/0091-7613(1999)027<1135:EESCIT>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 Central Basin fault in the center of the West Philippine Basin was first discovered ∼50 yr ago. It is a 1000-km-long ridge oriented northwest to southeast and is cut by north-south–trending fracture zones. Hypotheses about the origin and development of the Central Basin fault have remained unresolved until recently. Submersible observations and SeaBeam surveys show that the Central Basin fault is a segmented spreading ridge having a morphology similar to that of a slow spreading ridge, with a nontransform offset, a nodal deep, and an inside corner high. The distance from the ridge versus the depth of the sea floor, the obliqueness of sets of small trough and ridge structures, and heat-flow values both of the crestal and off-axis areas of the Central Basin fault suggest that the fault is not a simple spreading center, but rather underwent multiple spreading episodes. The texture and chemistry of basalts obtained from the ridge suggest that the lavas were formed in a backarc basin setting. These data confirm that the Central Basin fault is a slow backarc spreading center that has a more complicated evolutionary history than previously realized. 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.