한국 남동해역(대한해협) 대륙붕지역의 후 제4기 탄성파 층서 및 퇴적작용 Late Quaternary Seismic Stratigraphy and Sedimentation of the Southeastern Continental Shelf, Korea Strait원문보기
한국 남동해역에서 취득한 고해상 탄성파 탐사자료의 해석에 의하면 연구해역에 분포하는 해저퇴적층은 후 제4기 동안 형성된 7 개의 퇴적단위로 구성된다. 이들 퇴적단위들은 저해수면계열, 해침계열, 그리고 고해수면계열을 구성한다. 저해수면 계열은 저해수면 쐐기 퇴적단위(SU1) 와 슬럼프 및 슬라이드를 포함하는 질량류 퇴적단위(SU2)로 구성된다. 해침계열은 고해빈/연안 퇴적단위(SU3), 수로충진 퇴적단위(SU4), 해침 사질 퇴적단위(SU5), 해침사퇴 퇴적단위(SU6)등 4 개의 퇴적단위를 포함한다. 고해수면계열은 내대륙붕 니질 퇴적단위(SU7)로 구성 되며, 해수면이 현 수준에 도달한 지난 6000년 이후동안 낙동강과 섬진강에서 공급된 퇴적물로 구성된다.
한국 남동해역에서 취득한 고해상 탄성파 탐사자료의 해석에 의하면 연구해역에 분포하는 해저퇴적층은 후 제4기 동안 형성된 7 개의 퇴적단위로 구성된다. 이들 퇴적단위들은 저해수면계열, 해침계열, 그리고 고해수면계열을 구성한다. 저해수면 계열은 저해수면 쐐기 퇴적단위(SU1) 와 슬럼프 및 슬라이드를 포함하는 질량류 퇴적단위(SU2)로 구성된다. 해침계열은 고해빈/연안 퇴적단위(SU3), 수로충진 퇴적단위(SU4), 해침 사질 퇴적단위(SU5), 해침사퇴 퇴적단위(SU6)등 4 개의 퇴적단위를 포함한다. 고해수면계열은 내대륙붕 니질 퇴적단위(SU7)로 구성 되며, 해수면이 현 수준에 도달한 지난 6000년 이후동안 낙동강과 섬진강에서 공급된 퇴적물로 구성된다.
Interpretation of high-resolution seismic profiles from the southeastern continental shelf of Korea reveals that the sedimentary deposits consist of seven seismic units formed during the late Quaternary. These units comprise lowstand, transgressive, and highstand systems tracts. The lowstand systems...
Interpretation of high-resolution seismic profiles from the southeastern continental shelf of Korea reveals that the sedimentary deposits consist of seven seismic units formed during the late Quaternary. These units comprise lowstand, transgressive, and highstand systems tracts. The lowstand systems tract consists of a lowstand prograding wedge (SU1) and a mass flow deposit (SU2) including slumps and slides. The transgressive systems tract contains four seismic units: an ancient beach/shoreface deposit (SU3), a channel-fill deposit (SU4), a transgressive sand layer (SU5), and a transgressive sand ridge (SU6). The highstand systems tract consists of an inner-shelf mud deposit (SU7) derived from the Nakdong and Seomjin rivers during the last 6 ka when sea level was close to the present level.
Interpretation of high-resolution seismic profiles from the southeastern continental shelf of Korea reveals that the sedimentary deposits consist of seven seismic units formed during the late Quaternary. These units comprise lowstand, transgressive, and highstand systems tracts. The lowstand systems tract consists of a lowstand prograding wedge (SU1) and a mass flow deposit (SU2) including slumps and slides. The transgressive systems tract contains four seismic units: an ancient beach/shoreface deposit (SU3), a channel-fill deposit (SU4), a transgressive sand layer (SU5), and a transgressive sand ridge (SU6). The highstand systems tract consists of an inner-shelf mud deposit (SU7) derived from the Nakdong and Seomjin rivers during the last 6 ka when sea level was close to the present level.
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제안 방법
As such, the southeastern continental shelf of Korea serves as a site for 나nderstanding depositional and erosional processes associated with sea-level change. In this paper, we interpreted high- resolution seismic data (Fig. 2) to describe the geometry and ac#istic characters of the late Quaternary deposits and discuss the depositional history of the southeastern continental shelf ofKorea in response to the sea-level rise since the LGM.
대상 데이터
The mid-shelf in the central part of the Korea Strait forms a relatively flat platform covered by sandy sediments with gravels and shell debris (Park and Yoo, 1992). The outer shelf is located in the NE-SW trending the Korea Trough (Fig. 1). The bottom sediments in the Korea Trough consist of sandy mud and muddy sand.
2). The single-channel sparker profiles were collected using a 1 - 2 kJ sparker system (model EG&G 231A triggered capacitor bank, 232A power supply, 402-7 sparkarray, Benthos MESH 50/24P hydrostreamer, EPC 4600 graphic recorder). Shipboard navigation was controlled using a Global Positioning System (GPS).
The study area encompasses the narrow shelf between the southeastem tip of the Korean Peninsula and the Tsushima Island (Fig. 1). The area can be divided into inner shelf (shallower than 80 m depth), mid-shelf (80 - 120 m depth), and outer shelf (deeper than 120 m depth; Korea Trough) based on bottom sediment and topography (Park and Yoo, 1988).
The paleo-shoreline was probably located at water depths of about 120 - 130 m at that time. The study area occupied a narrow seaway, connecting the East China Sea to the East Sea (Min, 1994; Yoo et al., 2003). The longshore currents, passing through the constricted seaway, were probably much stronger than today, playing an important role in creating and shaping SU3.
이론/모형
This study uses high-resolution Sparker profiles acquired by the Korea Institute of Geosciences and Mineral Resources (KIGAM) (Fig. 2). The single-channel sparker profiles were collected using a 1 - 2 kJ sparker system (model EG&G 231A triggered capacitor bank, 232A power supply, 402-7 sparkarray, Benthos MESH 50/24P hydrostreamer, EPC 4600 graphic recorder).
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