The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Sequence Stratigraphy of Late Quaternary Deposits in the Southeastern Continental Shelf, Korea

한국 남동 대륙붕 후 제4기 퇴적층의 시퀀스 층서

  • 유동근 (한국지질자원연구원 석유해저연구부) ;
  • 이치원 (한국지질자원연구원 석유해저연구부) ;
  • 최진용 (군산대학교 해양정보과학과) ;
  • 박수철 (충남대학교 해양학과) ;
  • 최진혁 (국방과학연구소)
  • Published : 2003.11.01
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Abstract

Analysis of high-resolution seismic profiles and sediment data from the southeastern continental shelf of Korea reveals that the late Quaternary deposits consist of a set of lowstand (LST), transgressive (TST), and highstand systems tracts (HST) that corresponds to the sea-level change after the Last Glacial Maximum. LST (Unit I) above the sequence boundary consists of sandy mud or muddy sand deposited during the last glacial period and is confined to the shelf margin and trough region. TST (Unit II) between transgressive surface and maximum flooding surface consists of sandy sediments deposited during the postglacial transgression (15,000-6,000 yr BP). Although TST is widely distributed on the shelf, it is much thinner than LST and HST. On the basis of distribution pattern, TST can be divided into three sub-units: early TST (Unit IIa) on the shelf margin, middle TST (Unit IIb) on the mid-shelf, and late TST (Unit IIc) on the inner shelf, respectively. These are characterized by a backstepping depositional arrangement. HST(Unit III) above the maximum flooding surface is composed of the fine-grained sediments deposited during the last 6000 yrs when sea level was close to the present level and its distribution is restricted to the inner shelf along the coast.

한국 남동해역 대륙붕에서 취득된 고해상 탄성파 탐사자료와 퇴적물 시료의 분석에 의하면 후 제4기 퇴적층은 마지막 빙하기 이후의 해수면 변화에 의해 조절되는 저해수면계열, 해침계열, 고해수면계열로 구성된다. 시퀀스 경계면 위의 저해수면계열(층서단위 I)은 마지막 빙하기 동안 퇴적된 니질사 혹은 사질니 퇴적물로 구성되며 대륙붕단과 해곡의 외해역에 분포한다. 해침면과 최대해침면 사이에 위치하는 해침계열(층서단위 II)은 지난 15,000-6,000년 사이에 퇴적되었으며 주로 사질퇴적물로 구성된다. 해침계열은 연구해역 전반에 걸쳐 넓게 분포하지만 저해수면계열과 고해수면계열에 비해 박층으로 분포한다. 이러한 해침계열은 분포특성에 따라 3개의 소퇴적단위로 세분된다. 즉, 대륙붕단의 초기해침계열(Unit IIa), 중간대륙붕의 중기해침계열 (Unit IIb), 내대륙붕의 후기해침계열 (Unit IIc) 등으로 이들은 후배열층서의 특성을 가진다. 최대해침면 상부에 놓이는 고해수면계열(층서단위 III)은 해수면이 현수준에 도달한 지난 약 6,000년 이후에 퇴적된 현생 니질퇴적물로 구성되며 내대륙붕의 연안을 따라 제한적으로 분포한다.

Keywords

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