- 1Shantou University, Institute of Marine Sciences, Guangdong Provincial Key Laboratory of Marine Disaster Prediction and Prevention, Shantou, China
- 2Laboratory for Marine Mineral Resources, Laoshan Laboratory, Qingdao 266237, China
- 3Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266237, China
- 4Yantai center of Coastal Geology, China Geological Survey, Yantai 264004, China
Reliable chronology is crucial for reconstructing the sedimentary history and sea level fluctuations. However, the lack of robust ages for late Quaternary deposits on the North Yellow Sea (NYS) shelf hampered our understanding of its sedimentary processes. In this study, quartz optically stimulated luminescence (OSL) and feldspar post-infrared infrared stimulated luminescence (post-IR IRSL) dating protocol were utilized to establish a detailed chronostratigraphy for the upmost 30 m of core DLC70-2 from the central NYS. Based on lithology features and dating results, three transgressive layers (hereafter referred as T1, T2 and T3, respectively from top to bottom) were identified. The consistency between two OSL dates (10.3-6.7 ka) and six radiocarbon (14C) dates (10.4-4.9 cal ka BP) indicates that the T1 layer deposited during MIS 1. Five quartz samples yielded saturation ages of >53 ka, combined with one feldspar pIRIR290 age of 76±7 ka from the top of the T2, suggested that the T2 layer should have formed no later than MIS 5. For T3 layer, two saturated quartz ages of >71 ka and a feldspar corrected age (191±17 ka) revealed that the T3 layer has formed at least during MIS 7.
Based on the renewed chronostratigraphy of core DLC70-2, we reconstruct a comprehensive late Quaternary stratigraphy using ten previously published cores from the Bohai Sea and Yellow Sea. The occurrence of cold-water species Buccella frigida and Protelphidium tuberculatum during MIS 5 indicates there existed a cold-water mass (cyclonic eddy) similar to present-day marine circulation. Additionally, the late Quaternary stratigraphic correlation is supported by the previously chronostratigraphic reconstruction of coastal loess. These findings will enhance our comprehending on the sedimentary processes and their paleo-environment changes on the eastern Chinese shelves during late Quaternary.
Key words: luminescence dating; North Yellow Sea; late Quaternary; stratigraphic construction; transgressive deposits; core DLC70-2
How to cite: Tang, N., Wang, Z., Lin, P., Liu, Y., Wu, Z., Tian, H., Mei, X., Sun, J., Qi, J., Li, R., Wu, S., Chu, H., and Lai, Z.: Luminescence dating of core DLC70-2 from the North Yellow Sea in China and its implication for late Quaternary transgressions, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-15355, https://doi.org/10.5194/egusphere-egu25-15355, 2025.
