Sedimentary and structural evolution of the Eastern South Korea Plateau (ESKP), East Sea (Japan Sea)

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doi: 10.1016/j.marpetgeo.2017.04.014
Author(s): Horozal, Senay; Kim, Gil-Young; Cukur, Deniz; Bahk, Jang-Jun; Buchs, David; Ryu, Byong-Jae; Lee, Gwang Hoon; Kim, Seong-Pil
Author Affiliation(s): Primary:
Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea
Chungnam National University, South Korea
Cardiff University, United Kingdom
Pukyong National University, South Korea
Volume Title: Marine and Petroleum Geology
Source: Marine and Petroleum Geology, Vol.85, p.70-88. Publisher: Elsevier, Oxford, United Kingdom. ISSN: 0264-8172
Note: In English. 50 refs.; illus., incl. sects., 2 tables, sketch map
Summary: 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.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 16 Structural Geology; 20 Geophysics, Applied; Back-arc basins; Basement; Basin analysis; Basins; Cenozoic; Cores; Cretaceous; Expedition 346; Geophysical methods; Geophysical profiles; Geophysical surveys; IODP Site U1430; Integrated Ocean Drilling Program; Japan Sea; Lithostratigraphy; Mesozoic; Models; North Pacific; Northwest Pacific; Ocean basins; Pacific Ocean; Plate tectonics; Pleistocene; Quaternary; Reflection methods; Rifting; Sea-floor spreading; Seismic methods; Seismic profiles; Seismic stratigraphy; Sequence stratigraphy; Surveys; Tectonic elements; Tertiary; Ulleung Basin; West Pacific
Coordinates: N375409 N375410 E1313215 E1313215
Record ID: 2018051489
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands