Late quaternary sedimentation in the Ulleung Interplain Gap, East Sea (Korea) SCIE SCOPUS

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Title
Late quaternary sedimentation in the Ulleung Interplain Gap, East Sea (Korea)
Author(s)
Lee, SH; Bahk, JJ; Chough, SK; Back, GG; Yoo, HS
KIOST Author(s)
Lee, Sang Hoon(이상훈)
Publication Year
2004-05-31
Abstract
The Ulleung Interplain Gap (UIG) is a deep (2300-2700 m) passage which has served as a conduit for deep-water circulation between the Ulleung and Japan basins. A detailed analysis of Chirp (2-7 kHz) subbottom profiles (ca. 6270 line-km) and nine sediment cores (8.6-11.4 m long) together with age data of tephra layers and four AMS C-14 from the UIG and the adjacent areas reveals complex sedimentation caused by an interaction between bottom currents and mass flows during the last- and post-glacial periods. From high-resolution subbottom data, rock basement, slide/slump/rock-fall deposits, mass-flow chutes/channels, mass-flow deposits, bottom-current deposits, and a large-scale bottom-current channel system are recognized. Core sediments consist of various deposits of turbidites, muddy contourites, manganiferous contourites, and pelagic/hemipelagic sediments. Based on vertical distribution of sedimentary facies together with a chronostratigraphic framework, core sediments can be divided into Units I (< similar to 15 ka) and 11 (> similar to 15 ka). The extensive mass-flow deposits with slope failures on the entire slopes of topographic highs around the UIG and the dominant turbidites in Unit II (> similar to 15 ka) suggest that a relatively large amount of sediment was delivered into the UIG by frequent mass flows (recurrence intervals of ca. 250-500 years in the upper Unit II) during the last-glacial period. Erosion or hampered sedimentation by bottom currents is indicated by the truncated reflectors of channel walls and muddy/manganiferous contourites in the Ulleung Interplain Channel (UIC) along the UIG. Interbedded turbidites in the UIC floor reflect that some large-scale mass flows intermittently entered into the UIC. The UIC has an asymmetric channel-flank geometry. The southeastern flank shows a gentle, wide mound morphology of mass-flow deposits derived from large-scale slope failures on the slopes of the Oki Bank, reflecting a dominance of downslope gravitational processes over alongslope bottom currents. In contrast, the northwestern flank is characterized by a narrow, steep geometry of mass-flow deposits, where a relatively small amount of sediment derived from the slopes of the South Korea Plateau could not overcome bottom-current activity. The dominant muddy and manganiferous contourites with rare turbidites in Unit I (< similar to 15 ka) reflect intensified bottom currents and infrequent slope failures (recurrence intervals of ca. 1700-5000 years) during the post-glacial period. These conditions facilitated the formation of a thin, elongate mound of bottom-current drifts overlying mass-flow deposits on the southeastern UIC flank, and sustained erosion or hampered sedimentation in the UIC. (C) 2004 Elsevier B.V. All rights reserved.
ISSN
0025-3227
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5251
DOI
10.1016/j.margeo.2004.03.004
Bibliographic Citation
MARINE GEOLOGY, v.206, no.1-4, pp.225 - 248, 2004
Publisher
ELSEVIER SCIENCE BV
Subject
WESTERN BOUNDARY CURRENT; SOUTH-ATLANTIC-OCEAN; JAPAN SEA; VEMA CHANNEL; DEEP-SEA; DEPOSITIONAL SYSTEMS; CONTINENTAL-MARGIN; AMIRANTE PASSAGE; CONTOURITE FAN; PACIFIC-OCEAN
Keywords
deep passage; bottom current; turbidity current; debris flow; Ulleung Interplain Gap; East Sea (Sea of Japan)
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

Marine Geology,Marine Sedimentary Environments and Processes,Submarine slope failures and stability,해양지질,해양퇴적 환경 및 작용,해저사면 사태 및 안정성

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