In recent years, there are fierce debates among various views on chronology from elevated lakes (or large lake stage) in Late Pleistocene, with the newly developed OSL dating challenging the MIS3 hypothesis which is established based on 14C data. However, the cause to chronological framework discrepancy of this geologic event may either be the possibility that lakes in different regions have different geological evolution history, or the dating techniques used may be differentiated. Therefore, study on the same sedimentary sequence from lakes in Late Quaternary using OSL and 14C techniques comparatively is expected to reveal the intrinsic reason for the differentiating chronological dating of elevated lake events.
With the joint support by Key Program (history of East-Asian monsoon changes and high-and-low-latitude driving process in Quaternary recorded by Xingkai Lake deep drilling in Northeast China )of National Natural Science Foundation presided by Professor Shen Ji and Humboldt Foundation of Germany, and in cooperation with Applied Geophysics Institute of Leibniz in Germany, Nanjing Institute of Geography & Limnology.CAS has conducted a systematic dating on a core acquired via Xingkai Lake deep drilling, using OSL dating as the sample index (5cm/sample, high resolution continuous sampling), and them compared the results with 14C data. This research has proved from the angle of dating techniques that many 40 and 30 ka 14C data previously acquired may severely underestimate the real age of the sediment. Therefore, 14C chronology proposed by MIS3 hypothesis has been questioned. The paper has also illustrated the reason for underestimating the 14C dating of the older (>30 ka) sediments (especially the sediments with low organic contents). Based on the sedimentary rate variation established with OSL dating technique, the relations between the process of Xingkai Lake sedimentation and global and regional climate changes across the orbital scale have been discussed at the end of this paper.
Recently the above research finding has been carried on the world famous academic journal Earth and Planetary Science Letters.（Long, H., Shen, J., Wang, Y., Gao, L., Frechen, M., 2015. High-resolution OSL dating of a late Quaternary sequence from Xingkai Lake (NE Asia): Chronological challenge of the “MIS3a Mega-paleolake” hypothesis in China. Earth and Planetary Science Letters 428, 281-292. http://dx.doi.org/10.1016/j.epsl.2015.07.003）
