Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Late Quaternary Stratigraphy and Depositional Environment of Tidal Sand Ridge Deposits in Gyeonggi Bay, West Coast of Korea

서해 경기만 조석사주 퇴적층의 제4기 후기 층서 및 퇴적환경

  • Choi, Jae-Yong (Petroleum and Marine Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • Kwon, Yi-Kyun (Petroleum and Marine Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • Chung, Gong-Soo (Department of Geology, Chungnam National University)
  • 최재용 (한국지질자원연구원 석유해저연구본부) ;
  • 권이균 (한국지질자원연구원 석유해저연구본부) ;
  • 정공수 (충남대학교 지질환경과학과)
  • Received : 2011.09.28
  • Accepted : 2012.02.21
  • Published : 2012.02.29
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Abstract

Analysis on high-resolution seismic and core data reveals that the sedimentary strata in Gyeonggi Bay consists of four sedimentary units (Unit I-IV, from top to bottom) formed during the late Quaternary period. Unit I is interpreted as sediments of tidal flat and channel-fill deposits, formed during the Holocene transgression. Unit II is divided into shallow-marine facies unit in offshore area and channelized fluvial to estuarine facies unit in nearshore sand ridge and tidal flat. Unit III is considered as tidal flat deposits with the uppermost severely weathered and oxydized layers. This unit is composed of shallow marine sedimentary successions formed during the MIS-5 highstand. The lowermost Unit IV rests on Mesozoic basement rocks, considered as the shallow marine and shelf deposits formed before the MIS-5 lowstand.

서해 경기만 조석사주에서 획득한 고해상도 탄성파 탐사자료와 해상시추코어 분석에 의하면 연구지역의 제 4기 후기에 형성된 퇴적층은 총 4개의 퇴적단위(상부층부터 Unit I에서 Unit IV)로 구성된다. 퇴적단위 I은 조간대 및 조수로-충진 퇴적체로서, 홀로세 고해수면 시기동안 퇴적된 것으로 해석된다. 퇴적단위 II는 천해 퇴적상이 나타나는 외해역과 하천과 연계된 하성 퇴적상이 나타나는 조간대에서 조석사주 근접부로 나누어진다. 퇴적단위 III은 조석작용에 의한 조간대 퇴적환경 및 상부의 풍화된 퇴적층으로 각각 구분되며, 퇴적층은 산소동위원소 시기5동안 퇴적된 것으로 판단된다. 퇴적단위 IV는 조석사주 퇴적층의 최하부층으로 중생대 기반암 또는 산소동위원소 시기 5 이전에 퇴적된 층으로 해석된다.

Keywords

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