Optically stimulated luminescence dating of coastal sediments from southwestern Korea

Kim, Jin Cheul; Eum, Chul Hun; Yi, Sangheon; Kim, Ju Yong; Hong, Sei Sun; Lee, Jin Young

doi:10.1016/j.quageo.2012.03.008

Cited by 17 publications

(8 citation statements)

References 31 publications

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“…From the regional viewpoint of sea level rise in spatial and temporal terms, changes should have simultaneously influenced coastal areas and inland paleo-bay areas. This process involves shifts from freshwater-dominant to marine-dominant environments due to Holocene sea level rise (Stanley and Warne, 1994; Hori et al, 2004; Kim et al, 2012; Tanigawa et al, 2013; Lambeck et al, 2014, and references therein; Cho et al, 2017; Katsuki et al, 2017; Xiong et al, 2020). To trace specific geomorphological-geochemical settings (e.g., intertidal, estuary, and inner bay) that formed in response to sea level changes, information about sea level in previous times and paleo-water depth in the study area is essential (e.g., Lim et al, 2015, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…Long-term environmental changes in Daesan Basin and possible links to Holocene regional sea level changes From the perspective of Holocene coastal evolution, marine transgression is an important feature of present coastal areas in East Asia, resulting in remarkable shifts from freshwater-dominant to marine-dominant environments due to Holocene sea level rise (Hori et al, 2004;Kim et al, 2012;Tanigawa et al, 2013;Cho et al, 2017;Katsuki et al, 2017;Xiong et al, 2020). Efforts to reconstruct regional sea level changes in East and South Asian coastal areas have been made.…”

Section: Discussionmentioning

confidence: 99%

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Evolution of the paleo-Daesan Bay (Nakdong River, South Korea) as a result of Holocene sea level change

Lim

Han

et al. 2022

Quat. res.

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To explore sea level transgression in low-lying inland areas and its possible influence on prehistoric cultures, we investigated the physical and geochemical features of 20-m-long sedimentary cores from the previously seawater-filled Daesan Basin located in the middle reach of the present Nakdong River in Korea as proxies for seawater transgression deep inland areas due to Holocene sea level rise. Based on the relationships among grain size, total sulfur content (TS%), and carbon/sulfur (C/S) ratio, the first transgressive event was detected at ca. 8500 cal yr BP, caused by seawater influx along the present Nakdong River. Higher TS% (0.8–1%) and interbedded fossil oysters at 8000–6000 cal yr BP indicate marine environments, supporting a paleo-Daesan Bay with water depth of ~10–8 m. The common peaks in TS%, in both inland paleo-Daesan Bay and a present coastal area (Suncheon Bay) in southern Korea (e.g., at 3200 and 4700 cal yr BP), may indicate intervals of higher salinity, which suggests simultaneous responses to changes in sea level or hydroclimate. The duration of marine environment (paleo-Daesan Bay) in the remote inland from ca. 8000–3200 cal yr BP provides an analog for inland paleo-bay studies in East Asia.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Evolution of the paleo-Daesan Bay (Nakdong River, South Korea) as a result of Holocene sea level change

Lim

Han

et al. 2022

Quat. res.

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“…For the dating of fine-grained samples, chemically purified quartz grains of 4-11 μm in diameter were extracted using sodium pyrophosphate (Na 4 P 2 O 7 •10H 2 O) to remove any clay and hydrochloric acid (HCl) and hydrogen peroxide (H 2 O 2 ) to remove any carbonate and organic matter, respectively. Finally, the samples were etched in H 2 SiF 6 for chemical removal (Roberts, 2007;Kim et al, 2012). The separated quartz particles were analyzed at the KIGAM OSL laboratory.…”

Section: Methodsmentioning

confidence: 99%

The Sedimentary records of the Hapcheon impact crater basin in Korea over the past 1.3 Ma

et al. 2023

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The Hapcheon impact crater is the only meteorite impact crater identified on the Korean peninsula. However, the morphology of the impact crater and the nature of the meteorite collision are unknown. In this study, we analyzed the sedimentary facies using grain size data; computed tomography images, 14C, 10Be, and optically stimulated luminescence dating on a >66-m-long sediment core (20HCL04) recovered from the Hapcheon Basin. Four sedimentary units and 10 types of facies were documented in the Hapcheon Basin sediment core. The sedimentary units comprise 1) a lower part (unit 1) that is dominated by moderately to well-sorted coarse gravel, which contains some impact-related sediments; 2) a middle part (units 2 and 3) dominated by well-laminated mud; and 3) an upper part (Unit 4) that is dominated by poorly sorted coarse gravel supplied from the surrounding mountain slopes by alluvial and fluvial processes. After the meteorite impact, the Hapcheon impact crater was filled with deposits from the crater wall after ca. 1.3 Ma and the Hapcheon Basin became a deep lake environment. After ca. 0.5 Ma, sediments were supplied from the surrounding mountains until the lake was filled. Finally, sediments were deposited in an alluvial fan setting. In addition, the Hapcheon Basin sedimentary cores contain a tephra layer and deformed soft sediments that can be used to investigate volcanic and seismic events on the Korean Peninsula over the past 1.3 Ma.

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“…Past coastal evolution can be understood in terms of changes in long-term morphology and seawater-influenced bottom-water conditions (hypoxic, anoxic, euxinic, and so forth). Many previous studies have suggested that current coastal morphological evolution is the result of local or regional responses to past climate and sea-level changes since the last glacial maximum and deglacial periods (Stanley and Warne, 1994; Kim and Kennett, 1998; Dellwig et al, 2001; Chen et al, 2004; Hori et al, 2004; Mackie et al, 2005; Lamb et al, 2007; Shin et al, 2007; Nahm et al, 2008; Yang et al, 2008; Yu et al, 2010, 2011; Kim et al, 2012; Ishihara et al, 2012). These studies clearly demonstrated Holocene transgression in various regions in terms of millennial timescales, but there has been little study regarding coastal bottom water and sediment conditions due to the lack of a suitable index and compatible sedimentary records with high-resolution dating ages.…”

Section: Introductionmentioning

confidence: 99%

Holocene millennial-scale variability of coastal environments on the southern coast of Korea and its controlling factors

Lim,

Yi,

Kim

2023

Quat. res.

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Coastal evolution is influenced by past sea-level changes and resultant shifts from fluvial- to marine-dominant environments and the accompanying significant geochemical and isotopic changes in the water mass and sediments. We investigated the elemental and isotopic features of coastal sedimentary cores (27 m in length) from a small paleo-bay located on the southern coast of Korea to determine such geochemical variability and specify past changes in the bay environment and anoxic conditions and possible links to past climate changes. We analyzed total organic carbon (TOC), total sulfur (TS), their isotopes (δ13CTOC and δ34STS), and pyrite. The δ13CTOC values ranging from −25 to −19‰ (a proxy for terrestrial influence) were lower than average (−22.5‰) before 8300 cal yr BP and since 500 cal yr BP, while the intervening Early to Late Holocene showed higher δ13CTOC values, indicating a shallow coastal environment. The δ34STS values fluctuating between −35 and +5‰ resembled sedimentation rate change. Based on the changes in the ratios of TOC to TS (C/S ratios), sedimentation rate, and δ34STS, we found five possible periods with higher salinity and intensified anoxic conditions at millennial timescales: 8900–8200, 7950–6500, 5200–4300, 3500–2600, and 2000–1100 cal yr BP. These intensified anoxic conditions seem to have been influenced by increased air temperature and sea-surface temperature conditions, which could have intensified the intensity of thermal stratification (less ventilation and mixing) between surface and bottom waters and resultant anoxic conditions.

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Optically stimulated luminescence dating of coastal sediments from southwestern Korea

Cited by 17 publications

References 31 publications

Evolution of the paleo-Daesan Bay (Nakdong River, South Korea) as a result of Holocene sea level change

Evolution of the paleo-Daesan Bay (Nakdong River, South Korea) as a result of Holocene sea level change

The Sedimentary records of the Hapcheon impact crater basin in Korea over the past 1.3 Ma

Holocene millennial-scale variability of coastal environments on the southern coast of Korea and its controlling factors

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