Study of Holocene paleo-environmental evolution using cores from the downstream area of the Nakdong River Delta, Korea

Jeong, Eun Je; Woo, Han Jun; Kang, Jin Kyu; Lee, Jun-Ho; Choi, Jae Ung

doi:10.2112/si85-126.1

Cited by 8 publications

(4 citation statements)

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“…The sediment was likely first supplied to the ND-3 area; subsequently, as the elevation of the ND-3 drilling site increased over time, the sediment route changed and sediment was supplied into the ND-2 area by lateral switching. [22] and ND-2 data are modified from Shin. [18]).…”

Section: Correlation Between Nd-3 Knd-3 and Nd-2 Cores In The Lower Delta Plainmentioning

confidence: 99%

“…The evolution of the Nakdong River delta sedimentary environments in response to Holocene sea-level change is analyzed by comparing the data of ND-3 sediments to those of OW-1 [21], ND-1 [18,37], ND-2 [18], and SSDP-102 [41] (Figure 6). [22] and ND-2 data are modified from Shin [18]). The area filled with yellow color represents the different sedimentary environments between three cores.…”

Section: Evolution History Of the Nakdong River Deltamentioning

confidence: 99%

“…Moreover, the depositional environment changes have been studied based on the sedimentary characteristics of a series of drill cores: the OW-1 core sediments, located on the eastern side of the middle-upper area [21]; the ND-1 core sediments, located in the southwest delta plain [17,18]; the ND-2 core sediments [18], located in the sand bar of the downstream area of the Nakdong River delta (Figure 1). Recently, Jeong et al [22] interpreted the depositional environment change of the downstream core sediments (KND-3) since the LGM using description of the sedimentary facies. Yoo et al [23] discussed the depositional history of the Nakdong River delta using grain size data, dating, and seismic profiles of the present prodelta core sediments (SSDP-102).…”

Section: Introductionmentioning

confidence: 99%

“…Comparison of present lower delta plain cores. (a) Sedimentary columns and (b) comparison of age between the ND-3 KND-3, and ND-2 cores (KND-3 data are modified from Jeong et al[22] and ND-2 data are modified from Shin[18]). The area filled with yellow color represents the different sedimentary environments between three cores.…”

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confidence: 99%

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Evolution of Depositional Environments in Response to the Holocene Sea-Level Change in the Lower Delta Plain of Nakdong River Delta, Korea

et al. 2021

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The Nakdong River delta, located in southeastern Korea, preserves thick and wide sediments, which are suitable for the high-resolution study of the evolution of depositional environments in the lower delta plain area. This study traces the Holocene evolution of the Nakdong River delta using deep drill core (ND-3; 46.60 m thick) sediments from the present delta plain. Sedimentary units of the sediments were classified based on grain size compositions and sedimentary structures: (A) alluvial zone, (B) estuarine zone, (C) shallow marine, (D) prodelta, (E) delta front, and (F) delta plain. The weathered sediment, paleosol, was observed at 43.16 m below the surface. There is an unconformity (43.10 m) to separate a Pleistocene sediment layer in the lowermost part differentiating from a Holocene sediment layer in the upper part of the core. The shallow marine sedimentary unit (32.20~23.50 m), in which grain size decreases upward is overlain by the prodelta unit (23.50~15.10 m), which consists of fine-grained sediments and relatively homogeneous sedimentary facies. The boundary between the delta front unit (15.10~8.00 m) and the delta plain unit (8.00~0.00 m) appears to lie at 8.0 m, and the variation in grain size is different; coarsening upward in the delta front unit and fining upward in the delta front unit, respectively. These sediments are characterized by a lot of sand–mud couplets and mica flakes aligned along with cross-stratification, which may be deposited in relatively high-energy environments. Until 13 cal ka BP, the sea level was 70 m below the present level and the drilling site might be located onshore. At 10 cal ka BP, the sea level was located 50 m below the present level and the drilling site might be moved to an estuarine environment. From 8 to 6 cal ka BP, a transgression phase occurred as a result of coastline invasion by the rapid rise of the sea level. Thus, the drilling site was drowned in a shallow marine environment. After 6 cal ka BP, the sea level reached the present level, and, since then, progradation might begin to form, primarily by more sediment input. After this period, the progradation phase continues as the sediments have advanced and the delta grows.

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Section: Correlation Between Nd-3 Knd-3 and Nd-2 Cores In The Lower Delta Plainmentioning

confidence: 99%