Abstract
The Hengduan Mountains is in the transitional zone between the Qinghai-Tibet Plateau (QTP) and the Yunnan-Guizhou Plateau in China, and a key area for elucidating the Quaternary environmental changes in Asia. The paleo-Daocheng ice cap was located on the Shaluli Hilly Plateau in the northeastern Hengduan Mountains, the oldest moraines in the Hengduan Mountains region were found in the ice cap area. Such glacial landforms provide key evidence to study the timing when this area entered the cryosphere with the uplift of the QTP. However, it is difficult to collect suitable glacial boulders from these moraines for traditional terrestrial in-situ cosmogenic nuclide (TCN) exposure dating because of long-term severe moraine degradation. Here, we collected clast samples from the moraine surface and depth profile to constrain the age of the oldest moraine in Kuzhaori (moraine E) using TCN 10Be dating technique. The minimum 10Be ages of five clast samples from the moraine surface range from 187.4±1.5 to 576.8±4.3 ka, implying that the moraine has been seriously degraded since deposition. Based on the TCN 10Be concentrations of the samples from a depth profile and simulations, the exposure-erosion-inheritance history of the profile was obtained. By fitting to the profile 10Be concentrations using the chi-square test, the simulations yielded a reliable age of 626.0±52.5 ka for the moraine. Therefore, the oldest moraine (moraine E) in Kuzhaori was most likely formed at about 0.63 Ma ago, corresponding to the marine isotope stage (MIS) 16. This glaciation represents the maximum Quaternary glaciation after the QTP was elevated into the cryosphere by the Kunlun-Yellow River Tectonic Movement.
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Acknowledgements
We are very grateful to the anonymous reviewers for their critical and constructive comments, which helped improve the manuscript. This work was supported by the National Natural Science Foundation of China (Grant Nos. 41971009 & 41503054) and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA2000300).
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Zhang, Z., Zheng, J., Cui, H. et al. Cosmogenic 10Be dating of the oldest moraine in the Hengduan Mountains. Sci. China Earth Sci. 66, 2211–2223 (2023). https://doi.org/10.1007/s11430-022-1167-x
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DOI: https://doi.org/10.1007/s11430-022-1167-x