Journal of the Korean Geophysical Society (지구물리)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Seismic Stratigraphy and Depositional History of Late Quaternary Deposits on the Korea Strait Inner Shelf, Korea

  • Yoo, D.G. (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Lee, H.Y. (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Kim, S.P. (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Kim, K.O. (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Koo, N.H. (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Kim, Y.G. (Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
  • Published : 20021200
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Abstract

Interpretation of high-resolution seismic profiles collected from the inner shetf of the Korea Strait reveals that the shelf sequence in this area consists of three sedimentary units (I, II, and III in a descending order) formed after the last glacial maximum. Lower two units (II and III) represent the transgressive systems tract formed during the Holocene transgression, Unit III above the sequence boundary is interpreted to be the transgressive estuarine deposit, whereas Unit ll above the ravinement surface forms a thin transgressive sand which consists of the sediment produced through shoreface erosion and winnowing during the transgression. Unit I above the maximum flooding surface is the highstand systems tract consisting mainly of recent muds derived from the Nakdong River.

대한해협 내대륙붕에서 취득된 고해상 탄성과 탐사자료의 해석에 의하면 연구해역 내대륙붕에 분포하는 퇴적층은 마지막 빙하기 이후에 형성된 3개의 퇴적단위(I. II. III)로 구성된다. 하위에 놓이는 두 퇴적단위는 흘로세 해침동안 형성된 해침계열에 속한다. 시퀀스 경계면 위에 놓이는 퇴적단위 III은 해침과정 중 하구 환경 하메서 퇴적된 것으로 해석되는 반면 침식면 위에 놓이는 퇴적단위 II는 해침과정 중 침식 및 제동에 의해 형성된 박층의 해침모래에 속한다. 최대해침면 상부에 놓이는 퇴적단위 I은 고해수면계열에 해당되며 주로 낙동강에서 유입된 현생 니질퇴적물로 구성된다.

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