Basin genesis and magmatism in the Philippine Sea

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doi: 10.5026/jgeography.124.773
Author(s): Ishizuka, Osamu; Ohara, Yasuhiko; Yuasa, Makoto
Author Affiliation(s): Primary:
Geological Survey of Japan, Tsukuba, Japan
Japan Agency for Marine-Earth Science and Technology, Japan
Japan Coast Guard, Japan
Volume Title: Japan's continental shelf survey and its contributions to ocean floor geoscience
Volume Author(s): Ohara, Yasuhiko, prefacer; Kato, Yukihiro; Nishimura, Akira; Nakazawa, Tsutomu
Source: Japan's continental shelf survey and its contributions to ocean floor geoscience, prefaced by Yasuhiko Ohara, Yukihiro Kato, Akira Nishimura and Tsutomu Nakazawa. Chigaku Zasshi = Journal of Geography, 124(5), p.773-786. Publisher: Tokyo Geographical Society, Tokyo, Japan. ISSN: 0022-135X CODEN: CGZAAL
Note: In Japanese with English summary. 38 refs.; illus., incl. sketch maps
Summary: Characterizing the igneous basement and reconstructing the volcanotectonic history of the Philippine Sea are the major targets of surveys for delineating Japan's continental shelves operated by Ministry of Economy, Technology and Industry. Sampling using R/V Hakurei-maru No. 2 equipped with Deep-sea Boring Machine System (BMS) and arm dredges covers a wide area of the Philippine Sea. The results are summarized of 40Ar/39Ar dating and chemical and isotopic analyses on igneous rock samples from the Philippine Sea, particularly from the West Philippine Basin, and its surrounding area, and Kinan Seamount Chain in the Shikoku Basin. Both regions are characterized by Ocean Island Basalt (OIB)-like magmatism which formed oceanic plateaus (e.g., Urdaneta Plateau, Oki-Daito Rise) and seamounts (e.g., seamounts in Minami Daito Basin, Kinan Seamount Chain). However, the geochemical characteristics of OIB-like basalts and pattern of spatial and temporal variations of this type of magmatism indicate that sources and processes involved in magmatism in these two areas are clearly distinct.
Year of Publication: 2015
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 03 Geochronology; 05 Petrology, Igneous and Metamorphic; Ar/Ar; Back-arc basins; Basalts; Basins; Bathymetry; Cenozoic; Continental shelf; DSDP Site 292; DSDP Site 446; Deep Sea Drilling Project; IPOD; Igneous rocks; Kinan Seamount; Leg 31; Leg 58; Magmatism; Mid-ocean ridge basalts; Minami-Daito Basin; Miocene; Neogene; North Pacific; Northwest Pacific; Ocean basins; Ocean-island basalts; Pacific Ocean; Philippine Sea; Shikoku Basin; Tertiary; Urdaneta Plateau; Volcanic rocks; West Pacific
Coordinates: N150000 N250000 E1350000 E1250000
Record ID: 2017002595
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