Japan Geoscience Union Meeting 2016

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Poster

Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG59] Ocean Floor Geoscience

Thu. May 26, 2016 3:30 PM - 4:45 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Kyoko Okino(Ocean Research Institute, University of Tokyo), Keiichi Tadokoro(Research Center for Seismology, Volcanology and Earthquake and Volcano Research Center, Nagoya University), Osamu Ishizuka(Geological Survey of Japan, AIST), Tomohiro Toki(Faculty of Science, University of the Ryukyus), Narumi Takahashi(Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology)

3:30 PM - 4:45 PM

[SCG59-P04] Re-estimation of the evolution history of the West Philippine Basin

*Takeshi Matsumoto1 (1.Faculty of Science, University of the Ryukyus)

Keywords:West Philippine Basin, Geomagnetic anomaly

The evolution and spreading history of the northernmost area of the West Phillipine Basin (east of the Luzon Okinawa Fracture Zone, north of Benham Rise and Urdaneta Plateau) in the Philippine Sea Plate was re-tested through the recent marine geophysical (direct magnetic total force observation and that estimated by the observation by the 3-component geomagnetic measurement) data by JAMSTEC fleets cruises and the hydrographic survey expeditions by the Japan Coast Guard. The result suggests that the area was constructed by the seafloor spreading during 23-30Ma just after around 33Ma, the cessation of the spreading at the Central Basin Spreading Centre (CBSC) and the Huatung Basin (the northwesternmost area of the WPB, between Gagua Ridge and Taiwan Island). The result is consistent with the dating from the collected rock samples by the JAMSTEC’s ROV cruises in this area.