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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

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.

Keywords

Holocene sea-level rise;transgressive systems tract;seismic stratigraphy;Korea Strait

Acknowledgement

Supported by : 지식경제부

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