- Shantou university, Institute of Marine Sciences, Guangdong Provincial Key Laboratory of Marine Disaster Prediction and Prevention, Shantou, China (zhongping_lai@stu.edu.cn)
High-resolution (millennial-scale) chronology is becoming more and more important in sedimentary process reconstruction, which could uncover unexpected events, in particular hiatus. It is assumed that sediments in endorheic basin should be continuous. However, Our large luminescence chronology data revealed that, since late Quaternary, hiatus were common in the cores of the endorheic Qaidam Basin in the Tibetan Plateau, especially in the Last Glaciation Maximum (LGM) during which the endorheic lakes dried up and then the wind erosion was dominant.
Our large dataset of luminescence dating in deltas/fluvial-plains also displayed similar discontinuous pattern in core sediments, demonstrating unexpected hiatus which was omitted by previous studies, as well as the impacts of human activities revealed by changes of sedimentation rate.
It is strongly recommended the wider application of high-resolution chronostratigraphic methods in sedimentary research, and dense sampling for optically stimulated luminescence (OSL) dating. The combination of Single Aliquot Regeneration (SAR) protocol (Murray and Wintle, 2003) and Standardized Growth Curve (SGC) protocol (Roberts and Duller, 2004; Lai, 2006), SAR-SGC (Lai and Ou, 2013), routine used in our laboratory, will be of great help in this regard, which could save machine measurement time for at least 70%.
Key words: Luminescence chronology; high resolution; hiatus; sedimentary process.
References
Lai, Z.P., 2006, Testing the use of an OSL standardized growth curve (SGC) for determination on quartz from the Chinese Loess Plateau: Radiation Measurements, 41, 9–16, doi:10.1016/j.radmeas.2005.06.031.
Lai, Z.P, Ou, X.J., 2013. Basic procedures of optically stimulated luminescence (OSL) dating. Progress in Geograpgy, 32, 683-693 (in Chinese with English abstract).
Murray, A.S., and Wintle, A.G., 2003, The single aliquot regenerative dose protocol: potential for improvements in reliability: Radiation Measurements, 37, 377–381, doi:10.1016/S1350-4487(03)00053-2.
Roberts, H.M., and Duller, G.A.T., 2004, Standardised growth curves for optical dating of sediment using multiple-grain aliquots: Radiation Measurements, 38, 241–252, doi:10.1016/j.radmeas.2003.10.001.
How to cite: Lai, Z.: Chronological data is the best proxy in sedimentary process reconstruction, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-15450, https://doi.org/10.5194/egusphere-egu25-15450, 2025.
