Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Late Quaternary Transgressive Stratigraphy and its Depositional History in the Southeastern Continental Shelf, Korea

한국 남동해역 대륙붕 후 제4기 해침퇴적층서 및 퇴적역사

  • Yoo, Dong-Geun (Petroleum and Marine Resources Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Lee, Chi-Won (Petroleum and Marine Resources Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Kim, Seong-Pil (Petroleum and Marine Resources Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Park, Soo-Chul (Department of Oceanography, Chungnam National University)
  • 유동근 (한국지질자원연구원 석유해저연구본부) ;
  • 이치원 (한국지질자원연구원 석유해저연구본부) ;
  • 김성필 (한국지질자원연구원 석유해저연구본부) ;
  • 박수철 (충남대학교 해양학과)
  • Received : 2010.05.11
  • Accepted : 2010.08.30
  • Published : 2010.11.30
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Abstract

Analysis of high-resolution seismic profiles acquired from the southeastern continental shelf of Korea reveals that the late Quaternary transgressive deposits consist of six seismic units created in response to sea-level rise. These units with different seismic facies and geometry can be grouped into two distinct depositional wedges (paralic and marine) bounded by a ravinement surface. The paralic component underlying the ravinement surface consists of the sediment preserved from shoreface erosion and contains incised-channel fill, ancient beach-shoreface deposit and estuarine deposit. The top of paralic unit is truncated by a ravinement surface and overlain by marine component. The marine component consists of the sediment produced through shoreface erosion during landward transgression and contains mid-shelf sand sheet, mid-shelf sand ridge and inner shelf sand sheet. Such transgressive stratigraphic architecture of six sedimentary units is controlled by a function of lateral changes in the balance among rates of relative sea-level rise, sediment input and marine processes at any given time.

한국 남동해역에서 취득된 고해상 탄성파탐사자료의 해석에 의하면 연구해역에 분포하는 후 제4기 해침 퇴적층은 6개의 퇴적단위로 구성된다. 서로 다른 특징을 갖는 퇴적단위는 침식면에 의해 분리되는 2개의 퇴적단위(paralic and marine units)로 구분된다. 침식면위에 놓이는 paralic unit의 경우는 연안침식 작용으로부터 보존된 퇴적단위로 침식수로 충진퇴적단위, 고 해빈-연안 퇴적단위, 하구역퇴적단위 등을 포함한다. paralic unit의 상부는 침식면의 특징을 가지며 그 위에marine unit이 놓인다. Marine unit은 해침에 따른 연안침식에 의해 생석된 퇴적물로 구성되며 중간대륙붕 및 내대륙붕 사질퇴적층, 중간대륙붕 사퇴퇴적층 등이 포함된다. 연구해역에 분포하는 6개의 퇴적단위로 구성되는 해침퇴적층의 형성은 해침기간 동안 상대적 해수면 상승, 퇴적물 공급 및 해양 퇴적기작의 영향에 의해 조절되었다.

Keywords

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