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동해 울릉분지 제 4기 질량류 퇴적체 분포 및 기원

Distribution and Origin of Quaternary Mass Transport Deposit in the Ulleung Basin, East Sea

초록

동해 울릉분지에서 취득된 2차원 다중채널 탄성파 탐사자료의 해석에 의하면, 연구지역에 분포하는 제 4기 퇴적층은 침식부정합면에 의해 4개의 층서단위로 구분된다. 각 층서단위는 서로 다른 특징을 갖는 18개의 질량류 퇴적체로 구성된다. 탄성파 단면상에서 질량류 퇴적체는 캐오틱 혹은 투명한 음향상 특징을 보이며, 쐐기 혹은 렌즈상의 외부형태를 가진다. 질량류 퇴적체는 주로 울릉분지 남쪽사면 일대에 중첩되어 분포하며, 분지중앙으로 향하면서 층후가 얇아지는 경향을 보인다. 시간구조도에 의하면 연구지역의 중앙에는 주변보다 융기된 지형과 북서 및 북동방향의 저지대가 발달한다. 등시층후도에 의하면 연구지역의 남쪽으로부터 기원한 질량류 퇴적체는 사면을 따라 분지중앙으로 유입되었으며, 지구조운동으로 형성된 융기지형에 의해 두 방향으로 분리되어 발달하였다. 결과적으로 울릉분지에 분포하는 제 4기 질량류 퇴적체의 발달은 다량의 퇴적물 공급, 저해수면시기 동안의 가스하이드레이트 해리, 중앙부에 위치한 융기지형 등의 요인에 의해 크게 조절되었다.

Abstract

Analysis of multi-channel seismic reflection profiles collected from the Ulleung Basin reveals that the Quaternary sequence consists of four stratigraphic units separated by erosional unconformities. Individual stratigraphic unit includes eighteen mass transport deposits which are variable in geometric characteristics and spatial distribution. Each mass transport deposit on the seismic profile is acoustically characterized by chaotic or transparent seismic facies, and shows wedge or lens-shaped external geometry. The mass transport deposits, which comprise a succession of stacked wedges, mainly occur on the southern slope, and their thickness gradually decreases toward the basin plain. The time structure map of erosional unconformities shows that a tectonic-induced structural high and troughs toward the northwest and northeast are developed at the central part of the basin. Based on the isochron map, the mass transport deposits, originated from southern part of the study area, transported to the basin plain and can be divided into two groups by the structural high. Consequently, the mass transport deposits within the Quaternary sequence in the Ulleung Basin are largely controlled by the large amounts of sediment supply, dissociation of gas hydrate during the lowstands, and central structural high.

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