Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Seafloor Morphology and Surface Sediment Distribution of the Southwestern Part of the Ulleung Basin, East Sea

동해 울릉분지 남서부 해저지형 및 표층퇴적물 분포

  • Koo, Bon-Young (Department of Geology and Earth Environmental Sciences, Chungnam National University) ;
  • Kim, Seong-Pil (Department of Petroleum and Marine Research, Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Gwang-Soo (Department of Petroleum and Marine Research, Korea Institute of Geoscience and Mineral Resources) ;
  • Chung, Gong Soo (Department of Geology and Earth Environmental Sciences, Chungnam National University)
  • 구본영 (충남대학교 지질환경과학과) ;
  • 김성필 (한국지질자원연구원 석유해저연구본부) ;
  • 이광수 (한국지질자원연구원 석유해저연구본부) ;
  • 정공수 (충남대학교 지질환경과학과)
  • Received : 2014.03.11
  • Accepted : 2014.04.02
  • Published : 2014.04.30
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Abstract

Multi-beam echosounder data and grain size analysis data of surface sediment were acquired and analyzed in order to investigate the shelf-to-slope morphology, geological character, and their geological controlling factors in the southwestern margin of the Ulleung Basin. According to the morphological character, the continental shelf can be divided into two parts: (1) shallow (~100 m) and steep ($0.5^{\circ}$) inner shelf, (2) deep (100-300 m) and gentle ($0.2^{\circ}$) outer shelf. The continental slope is featured with eight distinct topographic depressions of various spatial dimension (~121 $km^2$ in area) and head wall gradient (${\sim}24.3^{\circ}$). They are developed adjacent to each other and presumably formed by submarine landslides which have recurred under the strong influences of earthquakes and eustatic sea-level change. The inner continental shelf and the continental slope are dominated by fine-grained sediment, whereas the outer continental shelf is dominated by coarse-grained sediment. The surface sediment distribution seems dominantly influenced by eustatic sea-level change. The outer continental shelf is mostly covered by coarse relict sediment deposited during lowstand sea-level, while the inner shelf is covered with recent sediment during highstand sea-level. The surface of the continental slope is covered with fine-grained sediments which were supplied by hemipelagic advection process.

울릉분지 남서부의 대륙붕-대륙사면 해저지형과 지질 특성을 규명하고, 이들에 영향을 주는 지질학적 요인을 파악하기 위하여 다중빔 음향측심자료와 표층퇴적물 입도를 분석하였다. 연구지역의 대륙붕은 약 ($0.5^{\circ}$의 경사로 수심 100 m 이내에서 나타나는 내대륙붕과 약 $0.2^{\circ}$의 경사로 수심 100-300 m 이내에서 나타나는 외대륙붕으로 구분할 수 있다. 대륙사면에는 다양한 규모(~121 $km^2$)와 경사(최대 $24.3^{\circ}$)를 갖는 8개의 사면붕괴 지형이 관찰된다. 각 사면붕괴 지형은 서로 인접해 있으며, 해저 지진과 전지구적 해수면 변동의 강한 영향 하에서 연속적으로 발생된 해저사태 기원으로 추정된다. 내대륙붕과 대륙사면은 세립질 퇴적물이 우세하지만, 외대륙붕은 조립질 퇴적물이 우세하다. 표층퇴적물 분포양상은 해수면 변동으로 인한 영향을 주로 받은 것으로 해석된다. 외대륙붕은 저해수면 시기 동안 퇴적된 조립질 잔류 퇴적물로, 내대륙붕은 고해수면 시기동안 퇴적된 현생의 세립 퇴적물로 피복되어 있다. 대륙사면의 표층퇴적물은 저해수면 시기에도 깊은 수심에서 반원양성 대류작용으로 공급된 세립퇴적물로 구성된다.

Keywords

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