[논문]황해 중동부 경기만의 후기 제4기 순차층서 연구

권이균

doi:10.5467/jkess.2012.33.3.242

황해 중동부 경기만의 후기 제4기 순차층서 연구
Late Quaternary Sequence Stratigraphy in Kyeonggi Bay, Mid-eastern Yellow Sea 원문보기

한국지구과학회지 = Journal of the Korean Earth Science Society, v.33 no.3, 2012년, pp.242 - 258

초록
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황해 경기만은 제4기에 반복된 해침과 해퇴로 4개의 해침-해퇴 퇴적체(DS-1, DS-2, DS-3, DS-4)를 형성하였다. 본 연구는 황해 경기만 퇴적체의 형성을 6개 퇴적단계로 나누어 설명한다. A 단계는 MIS-6 저해수면 시기로서 큰 규모의 해수면 하강으로 인해 대부분의 지역이 대기에 노출되고 광범위한 하도 침식 및 풍화작용의 영향을 받았다. 이어지는 B 단계는 MIS-5e 까지 빠른 해수면 상승과정에서 MIS-5 시퀀스의 하부 해침퇴적체가 형성되었고, 다음에 이어지는 MIS-5d부터 MIS-4 저해수면 시기까지의 C 단계에서는 MIS-5 시퀀스의 상부인 해퇴퇴적체가 만들어졌다. 다음의 D 단계는 MIS-4 저해수면 시기부터 MIS-3c 고해수면 시기까지로 하도 침식 및 하도 충전 구조로 이루어진 MIS-3 해침 퇴적체가 형성되었다. 다음의 E 단계에서는 LGM 시기까지 계속적인 해수면 하강이 있었고 외해쪽에서는 천해 기원의 MIS-3 해퇴퇴적체가 만들어진 반면에, 내륙쪽에서는 노출된 환경에서 하도 충전 퇴적체나 범람원 퇴적체가 형성되었다. 마지막 단계인 F 단계는 황해 전체적으로 홀로세 해침이 발생하였고, 이 시기에 외해쪽에서는 대륙붕 사질 퇴적체와 조석사주 퇴적체가 형성되어 고해수면 시기인 현재까지 퇴적이 일어나고 있다.

Abstract ▼ AI-Helper

The Yellow Sea has sensitively responded to high-amplitude sea-level fluctuations during the late Quaternary. The repeated inundation and exposure have produced distinct transgression-regression successions with extensive exposure surfaces in Kyeonggi Bay. The late Quaternary strata consist of four seismic stratigraphic units, considered as depositional sequences (DS-1, DS-2, DS-3, and DS-4). DS-1 was interpreted as ridge-forming sediments of tidal-flat and estuarine channel-fill facies, formed during the Holocene highstand. DS-2 consists of shallow-marine facies in offshore area, which was formed during the regression of Marine Isotope Stage (MIS)-3 period. DS-3 comprises the lower transgressive facies and the upper highstand tidal-flat facies in proximal ridges and forced regression facies in distal ridges and offshore area. The lowermost DS-4 rests on acoustic basement rocks, considered as the shallow-marine and shelf deposits formed before the MIS-6 lowstand. This study suggests six depositional stages. During the first stage-A, MIS-6 lowstand, the Yellow Sea shelf was subaerially exposed with intensive fluvial incision and weathering. The subsequent rapid and high amplitude rise of sea level in stage-B until the MIS-5e highstand produced transgressive deposits in the lowermost part of the MIS-5 sequence, and the successive regression during the MIS-5d to -5a and the MIS-4 lowstand formed the upperpart of the MIS-5 sequence in stage-C. During the stage-D, from the MIS-4 lowstand to MIS-3c highstand period, the transgressive MIS-3 sequence formed in a subtidal environment characterized by repetitive fluvial incision and channel-fill deposition in exposed area. The subsequent sea-level fall culminating the last glacial maximum (Stage-E) made shallow-marine regressive deposits of MIS-3 sequence in offshore distal area, whereas it formed fluvial channel-fills and floodplain deposits in the proximal area. After the last glacial maximum, the overall Yellow Sea shelf was inundated by the Holocene transgression and highstand (Stage-F), forming the Holocene transgressive shelf sands and tidal ridges.

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가설 설정

2. Each seismic units in Kyeonggi Bay (SU-1, SU-2, SU-3, and SU-4) are considered as depositional sequences. DS-1 was interpreted as tidal flat and estuarine channel-fill deposits formed during the Holocene highstand.

제안 방법

5-12 kHz) seismic profiles. Based on the integrating analyses on seismic and core sediment data, this study suggests a new pre-Holocene stratigraphic scheme and a sequence model for sedimentary response to the late Quaternary high-amplitude sea-level fluctuations.
7. Stratigraphic correlation of several sediment cores in offshore area (04DC-08, -11, and -35), sand ridge (YSDP-107), and tidal flats (GB-B01 and -B04). See Fig.
This study recognizes four depositional settings of tidal ridges in Keonggi Bay: offshore, distal tidal ridge, proximal tidal ridge, and tidal flats (Fig. 2B). Offshore Kyeonggi Bay consists mainly of a few meter thick, sand-prone facies formed during the Holocene transgression and the underlying late Pleistocene mud or sandy mud (Shinn et al.
Recently, voluminous geophysical and geological data have been obtained and compiled in order to establish the stratigraphy in the bay (KIGAM, 2004). This study uses deep-drilled NYSDP-101 and YSDP-106/107 cores and the supplementary deep-drilled sediment cores for analyses on lithology and chronology. The geophysical data include multi-channel air-gun, sparker (0.
This study uses three types of core sediments; deep-drilled cores, piston cores, and discontinuous hammer-pressure-cores (Fig. 2A). In 1998 and 2004, deep-drilled sediment cores (YSDP-107 and NYSDP-101) were obtained at the distal ridge top, using aboard drill-ship Khan-407.

대상 데이터

This study uses deep-drilled NYSDP-101 and YSDP-106/107 cores and the supplementary deep-drilled sediment cores for analyses on lithology and chronology. The geophysical data include multi-channel air-gun, sparker (0.3-1 kHz), and chirp (0.5-12 kHz) seismic profiles. Based on the integrating analyses on seismic and core sediment data, this study suggests a new pre-Holocene stratigraphic scheme and a sequence model for sedimentary response to the late Quaternary high-amplitude sea-level fluctuations.
The study area is located in Kyeonggi Bay, the largest macrotidal embayment along the western coast of Korea (Fig. 1). Unlike the rest of the Korean coast, it receives substantial sediment input from the Han River, leading to the accumulation of up to 60 m of the late Quaternary tidal deposits (Fig.
The air-gun and sparker seismic profiles taken in offshore area, tidal ridges, and shallow subtidal area of Kyeonggi Bay, show the presence of several seismic stratigraphic units bounded by regional unconformities or disconformities. This study recognizes four seismic units named SU-1 to SU-4 (Table 4; Fig. 6).

성능/효과

Resultant dates for pwUnit II are 25,220±200 yr BP (−8.1 m MHWL), 32,200±770 yr BP (−10.2 m MHWL), 21,940±800 yr BP (−12.0 m MHWL), and 44,500±1,600 yr BP (−25.3 m MHWL).

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