Sedimentary and structural evolution of the Eastern South Korea Plateau (ESKP), East Sea (Japan Sea) |
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| Institution: | 1. Department of Earth, Environmental and Planetary Studies, Brown University, Providence, RI, USA;2. National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba City, Ibaraki 305-0005, Japan;3. Christian-Albrechts-Universitat zu Kiel (IfG), Ludewig-Meyn-Strasse 10-14, 24118 Kiel, Schleswig Holstein, Germany;1. National Institute of Geological Sciences, University of the Philippines, Diliman, Quezon City 1101, Philippines;2. Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan;3. Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan;4. Geological Survey of Japan, AIST, Tsukuba, Ibaraki 305-8567, Japan;5. Marine Environment and Conservation Research Division, Korea Institute of Ocean Science and Technology, 787 Haeanlo, Ansan 426-744, Republic of Korea;1. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, USA;5. Department of Earth and Planetary Science, University of Tokyo, Tokyo 113-0033, Japan;6. Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, SOA, Qingdao 266061, China;1. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China;3. Institute of Groundwater and Earth Sciences, Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China;4. Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, SOA, Qingdao 266061, China;5. SEDISOR/UMR6538 “Domaines Oceaniques”, IUEM, Place Nicolas Copernic, 29280 Plouzane, France |
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| Abstract: | The East Sea (Japan Sea) is a semi-enclosed back-arc basin that is thought to preserve a significant record of tectonic evolution and paleo-climatic changes of Eastern Asia during the Neogene. We use here 2-D regional multi-channel seismic reflection profiles and borehole data from Expedition 346 of the Integrated Ocean Drilling Program (IODP) to provide new constraints on the geological history of the Eastern South Korea Plateau (ESKP). The ESKP represents a structurally-complex basement high in the southwestern East Sea which formed during rifting of the back-arc basin. Our new observations show that the ESKP is composed of numerous horsts and grabens controlled by NE-trending normal faults. The acoustic basement is blanketed by Oligocene to recent sediments that have preferentially accumulated in topographic lows (up to 1.5 km thick) and have been cored during Expedition 346 at Site U1430 close to the southern margin of the ESKP. Seismic profiles in the ESKP reveal three units separated by regional unconformities. These seismic units closely correspond to IODP lithostratigraphic units defined at Site U1430, where biostratigraphic data can be used to constrain the timing of three main evolutionary stages of the ESKP. Stage 1 was related to rifting in the late Oligocene and middle Miocene, terminated by a regional uplift leading to an erosional phase in the middle Miocene. Stage 2 was associated with subsidence in the middle and late Miocene and uplift and accompanying erosion or non-deposition in the latest late Miocene. Stage 3 (Pliocene to present) recorded overall uniform hemipelagic-pelagic subsidence of the ESKP with short-lived tectonically-induced uplifts in the late middle Miocene and latest Miocene-early Pliocene. The three stages of evolution of the ESKP closely correlate to sedimentary changes since the Oligocene and suggest a direct control of regional/local tectonics on sedimentation patterns in the southwestern East Sea, with secondary influence of regional climatic and paleo-oceanographic processes. |
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| Keywords: | Eastern South Korea Plateau (ESKP) Sedimentary and tectonic evolution Seismic reflection data interpretation IODP expedition 346 Site U1430 East Sea (Japan Sea) |
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