Title: Reinitiation of subduction and magmatic responses in SW Japan during Neogene time
Abstract: Research Article| July 01, 2005 Reinitiation of subduction and magmatic responses in SW Japan during Neogene time Jun-Ichi Kimura; Jun-Ichi Kimura 1Department of Geoscience, Shimane University, Matsue 690-8504, Japan Search for other works by this author on: GSW Google Scholar Robert J. Stern; Robert J. Stern 2Geosciences Department, University of Texas at Dallas, Richardson, Texas 75083-0688, USA Search for other works by this author on: GSW Google Scholar Takeyoshi Yoshida Takeyoshi Yoshida 3Institute of Mineralogy, Petrology and Economic Geology, Tohoku University, Aobaku, Sendai 980-7763, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Jun-Ichi Kimura 1Department of Geoscience, Shimane University, Matsue 690-8504, Japan Robert J. Stern 2Geosciences Department, University of Texas at Dallas, Richardson, Texas 75083-0688, USA Takeyoshi Yoshida 3Institute of Mineralogy, Petrology and Economic Geology, Tohoku University, Aobaku, Sendai 980-7763, Japan Publisher: Geological Society of America Received: 14 Jan 2004 Revision Received: 23 Dec 2004 Accepted: 10 Jan 2005 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2005) 117 (7-8): 969–986. https://doi.org/10.1130/B25565.1 Article history Received: 14 Jan 2004 Revision Received: 23 Dec 2004 Accepted: 10 Jan 2005 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Jun-Ichi Kimura, Robert J. Stern, Takeyoshi Yoshida; Reinitiation of subduction and magmatic responses in SW Japan during Neogene time. GSA Bulletin 2005;; 117 (7-8): 969–986. doi: https://doi.org/10.1130/B25565.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Southwestern Japan during Paleogene time was affected by subduction of the Kula and Pacific plates beneath the eastern margin of Eurasia, followed by a brief episode of transform faulting to allow the Shikoku Basin to open at 27–15 Ma. Subsequent opening of the Japan Sea back-arc basin in middle Miocene time broke Japan away from Eurasia, and SW Japan rotated clockwise ∼45° as it drifted south (17–15 Ma). Southward drift required subduction of the Philippine Sea plate beneath SW Japan, leading to the formation of a magmatic arc. Subduction of the hot Shikoku Basin lithosphere and spreading ridge resulted in distinctive volcanism in the SW Japan forearc between 17 and 12 Ma. This volcanism included mid-oceanic-ridge basalt (MORB)-like intrusions and oceanic-island basalt (OIB)–type alkali basalts, felsic plutons in the accretionary prism, and high-magnesium andesites along the Setouchi forearc basin. Mafic magmas in the outermost forearc originated from the subducted Shikoku Basin spreading ridge, whereas Setouchi high-magnesium andesites (HMA) may have resulted from the interaction of melts of the subducted Philippine Sea plate with the overlying mantle. Felsic magmas in the forearc resulted from melting of Shimanto Belt sediments caused by intrusion of HMA magmas. Persistent rear-arc volcanism was caused by upwelling asthenosphere associated with opening of the Sea of Japan. Rear-arc volcanism began ca. 25 Ma as rift-fill low-alkali tholeiite volcanism and was replaced gradually after 12 Ma by alkali basalt volcanism. Upwelling-related alkali volcanism continues up to the present, whereas forearc volcanism ceased at 12 Ma. The volcanic arc narrowed with time as the Philippine Sea slab descended and slowly cooled. Adakitic dacites erupted after 1.7 Ma above the 100-km-depth contour of the sub-ducted Philippine Sea plate, suggesting that melting resulted from interaction of the slab with upwelling asthenosphere. Interactions between upwelled rear-arc asthenosphere and subduction of the hot Philippine Sea slab appear to have been the main controls of magmatism for the Neogene SW Japan arc. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 2005
Publication Date: 2005-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 225
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