Late Neogene to Quaternary turbidite deposition in the northern Japan Basin and its relation to regional tectonics

Ken Ikehara; Tomohisa Irino; Takuya Itaki

Presentation information

Oral

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

[S-CG59] Ocean Floor Geoscience

Thu. May 26, 2016 9:15 AM - 10:30 AM 301B (3F)

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), Chair:Juichiro Ashi(Atmosphere and Ocean Research Institute, The University of Tokyo), Takahiro Hiramatsu(Asia Air Survey Co., Ltd.)

10:00 AM - 10:15 AM

[SCG59-16] Late Neogene to Quaternary turbidite deposition in the northern Japan Basin and its relation to regional tectonics

*Ken Ikehara¹, Tomohisa Irino², Takuya Itaki¹ (1.Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology, 2.Hokkaido University)

Keywords:turbidite, Eastern margin of Japan Sea, tectonics

Many fine-grained turbidite beds occurred in core at Site U1422 of IODP Expedition 346 on the northeastern Japan Basin. Turbidite sediments contain much feldspar, suggesting grain supply of volcanic materials from the Japanese island arc. Muddy turbidite disappears at around 1.7 Ma. Stepwise decreasing of sedimentation rate at around 1 and 0.6 Ma also reflects the change of uplift mode of the Okushiri Ridge. Both change of turbidite deposition and of sedimentation rate in the northeastern Japan Basin margin might reflect the regional tectonics along the eastern margin of the Japan Sea.