Pleistocene magnetic susceptibility and paleomagnetism of the Tibetan loess and its implications on large climatic change events |
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Authors: | Yan Maodu Fang Xiaomin Chen Shiyue Yang Shengli L Lianqing Li Jijun An Zhisheng |
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Institution: | 1.MOE National Laboratory of Western China’s Environmental Systems & Department Geography, Lanzhou University, 730000, Lanzhou, China ;2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment of Chinese Academy of Sciences, 710054, Xi’an, China ; |
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Abstract: | Ganzi loess represents the oldest Tibetan loess, its formation is the key to determining the readjustment of Tibetan atmospheric circulation and the relationship between Tibetan uplift and global climatic change. Detailed magnetostratigraphic study shows that the Ganzi loess was formed at about 1.13 MaBP. It also reveals that there are two notable climatic events occurring in 0.95–0.92 Ma and 0.65–0.5 Ma respectively. The both demonstrate that the Tibetan atmospheric circulation was readjusted and the Tibetan Plateau entered the cryosphere at 21.13 Ma, and the Tibetan glaciation might reach its maximum at ~0.65–0.5 Ma. |
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