2007 Fiscal Year Final Research Report Summary
Geotectonic evolution of the West Philippine Basin: Petrological and geochemical characterization and interaction of spreading ridge with mantle plume upwelling
| Project/Area Number |
17540458
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
SHINJO Ryuichi University of the Ryukyus, Faculty of Science, Professor (30244289)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUMOTO Takeshi University of the Ryukyus, Faculty of Science, Professor (30344287)
ISHIZUKA Osamu University of the Ryukyus, Institute of Geoscience and Geoinformation, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Full-time scientist (90356444)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Back-arc basin / Philippine Sea Plate / oceanic spreading system / mantle / Sr-Nd-Pb isotope ratios / geochemistry / basalts / plume |
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| Research Abstract |
The West Philippine Basin (WPB) represents the oldest back-arc basin in the Philippine Sea Plate. To address unsolved question about its tectono-magmatic evolution, we have conducted two scientific survey cruises (KR03-04 and KR04-14). Integrative data by multi-narrow beam mapping reveals the complicated morphology in the northwestern part of WPB. The study area can be divided into two domains and separated by the NE-SW trending Okinawa-Luzon Fracture Zone (OLFZ), which appears to be right-lateral offset. The eastern domain of the OLFZ is characterized by series of relict overlapping spreading center (OSC). The OSC systems developed with the spreading segment located north of the system retreating, being progressively cancelled on the benefit of a new propagating rifts located more to the sough, implying successive southward ridge jumps. All observed propagating rift systems have propagated from east to west, i.e., away from the plume (Uldaneta Plateau). By contrast, the western domain of OLFZ demonstrates rather simple spreading fabrics. Whole-rick Ar-Ar dating for recovered basalts revealed reliable plateau-ages of ~32-40 Ma, which are ~10m. y. younger than previously suggested formation ages. Lavas from eastern domain of OLFZ have enriched geochemical compositions similar to E-MORB and/or ocean island basalts (OIB), which are compatible with morphological features and suggest contribution of deep source component to magma genesis. In contrast, basalts from western domain of OLFZ bear N-MORB affinity with Pb isotopic characteristics of the Indian Ocean MORB-type mantle, suggesting involvement of Indian ocean MORB-type asthenospheric mantle during early stage of the formation of the Philippine Sea Plate.
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[Journal Article] Submarine, across-arc normal fault system in the southwest Ryukyu arc triggered the 1771 tsunami hazard? : field evidences from multibeam survey and in-situ observation by ROV.2009
Author(s)
Matsumoto. T., Shinjo. R., Nakamura, M., Doi, A., Kimura, M., Pno, T., Kubo, A.
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Journal Title
Polish J. Environ. Stud. 18
Pages: 123-129
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Seismic structure of the upper mantle beneath the Philippine Sea from seafloor and land observation: Implications for mantle convection and magma genesis in the Izu-Bonin-Mariana subduction zone.2009
Author(s)
Isse, T., Shiobara, H., Tamura, Y., Suetsugu, D., Yoshizawa, Y., Sugioka, H., Ito, A., Kanazawa, T., Shinohara, M., Mochizuki, K., Araki, E., Nakahigashi, K., Kawakatsu, H., Shito, A., Fukao, Y., Ishizuka, P., Gill, J. B.
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Journal Title
Earth Planet. Sci. Lett. 278
Pages: 107-119
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Propagators and ridge jumps in a back-arc basin, the West Philippine Basin.2008
Author(s)
Deschamps, A., Shinjo. R., Matsumoto. T., Lee, C. -S., Lallemand, S. E., Wu, S., Scientific party of KR03-04, KR04-14 cruises
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Journal Title
Terra Nova 20
Pages: 327-332. doi : 10.1111/j. 1365-3121.2008.00824.x.
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Data report: Pb isotope compositions of sediment from the eastern flank of Juan de Fuca Ridge.2008
Author(s)
Noguchi, T., Shinjo. R., Oomori, T.
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Journal Title
In Fisher, A. T., Urabe, T., Klaus, A., the Expedition 301 Scientists, Proc. IPDP, 301: College Station, TX (IPDP Management International, Inc.).
Pages: doi : 102204/iodp.proc.301.203.2008.
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Early stages in the evolution of Izu-Bonin arc volcanism: New age, chemical, and isotopic constraints.2006
Author(s)
Ishizuka, P., Kimura, J.-I, Li, Y. B., Stern, R. J., Reagan, M. K., Taylor, R. N., Ohara, Y., Bloomer, S. H., Ishii, T., Hargrove III, U. S., Haraguchi, S.
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Journal Title
Earth Planet. Sci. Lett. 250
Pages: 385-401
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Variation in the mantle sources of the northern Izu arc with time and space -Constraints from high-precision Pb isotopes.2006
Author(s)
Ishizuka. O., Taylor, R. N., Milton, J. A., Nesbitt, R. W., Yuasa, M., Sakamoto, I.
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Journal Title
J. Volcanol. Geotherm. Res. 156
Pages: 266-290
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Origin of the Pliocene-Quaternary magmatism in Northern Taiwan : subduction vs post-collisional extension.2009
Author(s)
Wang, K. -L., Chung, S. -L., Shinjo. R., Chen, C.-H., Chen, C.-H.
Organizer
3rd Taiwan-Japan Earth Science Symposium.
Place of Presentation
Naha, Okinawa, Japan.
Year and Date
20090000
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Plume evolution : the Afar plume case.2007
Author(s)
Shinjo. R., Meshesha, D.
Organizer
IODP workshop 'Investigating Large Igneous Province : development and consequences'
Place of Presentation
Coleraine, Northern Ireland, UK.
Year and Date
20070000
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Nd-Sr-Pb isotope composition of post-collisional volcanic rocks in front of an accreted terrane suture zone, Cantwell Formation, Central Alaska Range.2006
Author(s)
Cole, R. B., Chung, S. -L., Ridgway, K. D., Shinjo. R.
Organizer
102nd Annual Meeting of the Cordilleran Section, GSA, 81st Annual Meeting of the Pacific Section, AAPG, and the Western Regional Meeting of the Alaska Section.
Year and Date
20060000
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Submarine, across-arc normal fault system in the southwest Ryukyu Arc: trigger of the 1771 tsunami hazard?2006
Author(s)
Matsumoto. T., Shinjo. R., Nakamura, M., Kubo, A., kimura, M., Ono, T.
Organizer
American Geophysical Union 2006 Fall Meeting
Place of Presentation
San Francisco
Year and Date
20060000
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Proterozoic mantle lithosphere beneath the East African Rift (Southern Ethiopia) : In situ Re-Os evidence.2005
Author(s)
Wang, K.-L., O'Reilly, S., Griffin, W., Pearson, N., Matsumura, R., Shinjo. R.
Organizer
15th Goldschmidt Conference
Place of Presentation
Moscow, Idaho, USA.
Year and Date
20050000
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Active faults and underwater landslides around the Ryukyu Islands.2005
Author(s)
Mntsnmoto. T., Shinjo. R., Nakamura, M., Kimura, M_6 Ono, T., Yasuno, M.
Organizer
"Proceedings of International Symposiun on Marine Geoscienes-New Observation Data and Interpretation", Organizing Comm. of International Symposium on Marine Geosciences
Place of Presentation
JAMSTEC Yokohama Institute for Earth Sciences, Yokohama, Japan.
Year and Date
20050000
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Behavior of aluminium and DOC in waters of the Gesashi mangrove estuary, Okinawa, Japan.2005
Author(s)
Kombo, M., Bakari, S., Okada, K., Fujimura, H., Shinjo. R., Tokuyama, A.
Organizer
Japan Geochemical Society Meeting
Place of Presentation
University of the Ryukyus.
Year and Date
20050000
Description
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