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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (4): 253-263.DOI: 10.7522/j.issn.1000-694X.2022.00019

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High-resolution monsoonal environment change in MIS3 based on trace elements in the Tumen Section on the southweest edge of Tegger Desert

Min Chen1(), Baosheng Li1,2(), Fengnian Wang3, Dongfeng Niu4, Xiaohao Wen1, Peixian Shu2, Yuejun Si5, Qinjiang Yang6, Chen Wang7   

  1. 1.School of Geography,South China Normal University,Guangzhou 510631,China
    2.State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061,China
    3.School of Geography and Tourism,Huizhou University,Huizhou 516007,Guangdong,China
    4.School of Geographical Sciences,Lingnan Normal University,Zhanjiang 524048,Guangdong,China
    5.School of Geography and Planning,Nanning Normal University,Nanning 530001,China
    6.Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China
    7.Faculty of Science,Tibet University,Lhasa 850000,China
  • Received:2021-11-17 Revised:2022-02-18 Online:2022-07-20 Published:2022-08-29
  • Contact: Baosheng Li

Abstract:

The TMS3 segment in the Tumen section, equivalent to the MIS3, is located at the southwest margin of the Tengger Desert. Based on the sedimentary sequences analysis and 14C and OSL dating ages, geochemical trace elements were analyzed. The study shows that TMS3 segment consists of interbedding stratigraphic sequences of dune sands with loess-like subsoil, sandy loess, lacustrine facies, alluvial loess, or paleosols, forming 14.5 sedimentary cycles. The contents of trace elements Mn, P, Sr, Rb, V, Zn, Cr, Ni, Cu, Nb are low in dune sands, but high in other 5 sedimentary facies in the TMS3, and the ratios of Rb/Sr display reversed tendency, which show obvious element contents and Rb/Sr ratios alternation with low values and high peaks between dune sands and other 5 sedimentary facies, indicating 14.5 elemental cycles ECY1-ECY14.5, which are consistent with sedimentary cycles. It suggests that 14.5 element cycles in the TMS3 represent 14.5 monsoonal cycles (MCY1—14.5) in the alternation of East Asian winter and summer monsoons during the MIS3, including 14 times of winter monsoons and 15 times of summer monsoons, and average time duration of each monsoon cycle is 2.48ka. 15 summer monsoon events recorded by trace elements in the TMS3 correspond well to the stadials revealed in the ice core of the GRIP and by δ18O in Huludong Cave, as well as those found in the adjacent area in the loess in Gulang during the MIS3. The geochemical migration and accumulation and sedimentary facies in the TMS3, to some extent, illustrate East Asian winter and summer monsoon environment changes in the Tengger Desert in response to the cold-warm climate fluctuations in the Northern Hemisphere during the MIS3.

Key words: MIS3, Tengger Desert, trace elements, Rb/Sr ratios, East Asian monsoon, Millennium scale climate variability

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