Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Seismic Stratigraphy and Depositional History of Holocene Transgressive Deposits in the Southeastern Continental Shelf, Korea

한국 남동해역 홀로세 해침퇴적층의 탄성파층서 및 퇴적역사

  • Yoo, Dong-Geun (Korea Institute of Geoscience and Mineral Reseouces (KlGAM)) ;
  • Kim, Seong-Pil (Korea Institute of Geoscience and Mineral Reseouces (KlGAM)) ;
  • Lee, Chi-Won (Korea Institute of Geoscience and Mineral Reseouces (KlGAM)) ;
  • Park, Soo-Chul (Department of Oceanography, Chungnam National University)
  • 유동근 (한국지질자원연구원 석유해저연구본부) ;
  • 김성필 (한국지질자원연구원 석유해저연구본부) ;
  • 이치원 (한국지질자원연구원 석유해저연구본부) ;
  • 박수철 (충남대학교 해양학과)
  • Received : 2011.02.25
  • Accepted : 2011.08.03
  • Published : 2011.08.28
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Abstract

Analysis of high-resolution seismic profiles from the southeastern continental shelf of Korea reveals that the Holocene transgressive deposits consist of five sedimentary units characterized by retrograding or backstepping depositional arrangements. Unit I, forming a linear sediment body along the shelf margin, is an ancient beach/shoreface deposit formed during the early stage of transgression. During the transgression, the paleo-channels were backfilled with fluvial or coastal-plain sediments, forming Unit II as an incised-channel fill deposit. The near-surface sediment was reworked and eroded by shoreface erosion, forming a thin lag of sands (Unit III) on the midshelf. During the middle stage of the transgression, the shoreline may have stabilized at around 70 - 80 m below the present sea level for some period of time to allow the formation of sand ridge systems (Unit IV). Unit V in the inner shelf was deposited in an estuarine environment during the middle to late stage of transgression. Such transgressive stratigraphic architecture 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.

한국남동해역에서 취득된 탄성파 탐사자료의 분석에 의하면 연구해역에 분포하는 홀로세 해침퇴적층은 육지쪽으로 향하면서 후퇴퇴적층서를 보여주는 5개의 퇴적단위로 구성 된다. 대륙붕단을 따라 길게 발달하는 퇴적단위 I은 홀로세 해침초기에 연안환경 하에서 형성된 고해빈/연안퇴적층에 해당된다. 해침이 진행되는 동안 고수로는 하성 혹은 연안퇴적물에 의해 충진 되기 시작하였으며 대륙붕을 가로질러 분포하는 퇴적단위 II인 수로충진퇴적층을 형성하였다. 해침이 진행되면서 기존 퇴적층의 침식 및 재동에 의한 박층의 사질퇴적물이 퇴적되었으며 중간대륙붕에 넓게 분포하는 퇴적단위 III를 형성하였다. 해침중기 동안 현해수면수심 70-80 m 수준에서 해수면 상승속도가 둔화 내지 정체되면서 퇴적단위 IV를 구성하는 사퇴퇴적체가 생성되었다. 내대륙붕에 분포하는 퇴적단위 V는 해침 중기 및 후기에 하구환경 하에서 퇴적된 염하구퇴적단위에 해당된다. 상기특정을 갖는 해침퇴적체의 형성은 해침 기간 동안 상대적 해수면 상승 속도, 퇴적물 공급 및 시기에 따른 해양 퇴적기작의 상호 영향에 의해 조절되었다.

Keywords

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