Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Late Quaternary Stratigraphy and its Depositional History in the Inner Shelf off the Southern Coast, Korea

한국 남해 내 대륙붕 후 제4기 층서 및 퇴적역사

  • Yoo, Dong-Geun (Petroleum and Marine Research Division, Korea Institute of Geoscience and mineral Resources (KIGAM)) ;
  • Lee, Ho-Young (Petroleum and Marine Research Division, Korea Institute of Geoscience and mineral Resources (KIGAM)) ;
  • Park, Keun-Pil (Petroleum and Marine Research Division, Korea Institute of Geoscience and mineral Resources (KIGAM)) ;
  • Koo, Nam-Hyung (Petroleum and Marine Research Division, Korea Institute of Geoscience and mineral Resources (KIGAM)) ;
  • Kim, Jong-Chon (Underwater Survey Technology21)
  • 유동근 (한국지질자원연구원 석유해저연구부) ;
  • 이호영 (한국지질자원연구원 석유해저연구부) ;
  • 박근필 (한국지질자원연구원 석유해저연구부) ;
  • 구남형 (한국지질자원연구원 석유해저연구부) ;
  • 김종천 (유에스티21)
  • Published : 2005.11.30
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Abstract

Analysis of high-resolution seismic profiles acquired from the inner shelf off the southern coast of Korea reveals that the inner shelf sequence can be divided into three stratigraphic units formed after the Last Glacial Maximum (LGM). Unit I is characterized by complex seismic facies including semi-transparent, stratified, and hummocky reflections on seismic records. It consists of sandy mud or muddy sand, deposited under estuarine environment during the post-glacial transgression. Unit II acoustically shows semi-transparent or hummocky reflections and consists of sand with gravels and shell debris, produced by shoreface erosion during the transgression. Unit III is characterized by transparent or semi-transparent seismic facies and consists of mud originated from the Nakdong and Seomjin rivers during recent highstand of sea level. Unit III is confined to the inner shelf with an extenal form of stratal wedge.

한국 남해 내 대륙붕에서 취득된 고해상 탄성파 탐사 자료의 분석에 의하면 연구해역 내 대륙붕 퇴적층은 지난 마지막 빙하기 이후 형성된 3개의 층서단위로 구분된다. 퇴적단위 I은 탄성파 단면상에서 반투명 음향상, 층리 음향상, 허모키 음향상 특징을 가진다. 이러한 퇴적단위 I은 후빙기 해침동안 하구역 환경에서 퇴적된 사질니 혹은 니질사 퇴적물로 구성된다. 퇴적단위 II는 역과 패각을 포함하는 사질퇴적물로 구성되며 후빙기 해침동안 연안침식에 의해 형성되었다. 퇴적단위 III은 투명 혹은 반투명 음향상 특징을 가지며, 현세 고해수면 조건하에서 퇴적된 낙동강 및 섬진강 기원의 니질 퇴적물로 구성된다. 본 퇴적단위는 내대륙붕에 제한적으로 분포하며 외해를 향하면서 층후가 감소하는 쐐기 형태로 발달한다.

Keywords

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