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Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (2): 11-20.DOI: 10.7522/j.issn.1000-694X.2022.00103

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Geochemical characteristics of major elements and environmental evolution in the Holocene in the northeastern Tibetan Plateau

Mengjun Hu(), Jing Zhuang, Wenli Sun, Dengyou Zheng, Tianqi Ji, Aokang Xu   

  1. College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China
  • Received:2022-04-20 Revised:2022-07-07 Online:2023-03-20 Published:2023-04-12

Abstract:

Based on the analysis of the content and ratio of major element oxides from the aeolian sand-paleosoil sequence of Zeku profile in the northeastern Tibetan Plateau, combined with 14C dating, the geochemical characteristics of major elements of Zeku profile are revealed, and the environmental evolution in the Holocene in the northeastern Tibetan Plateau is discussed. The results show that: (1) The chemical composition of the sediment is mainly SiO2, Al2O3 and CaO, of which the standard deviation of SiO2 and CaO is higher and more sensitive to climate change. (2) From the bottom to the top of the profile, the contents of SiO2 and Ki decrease first and then increase, and the high values indicate a cold and dry climate, while the contents of CaO and W are opposite, and the high values indicate a warm and wet climate. (3) Since 9.4 ka BP, the climate of the northeastern Tibetan Plateau has undergone a transition from warm and wet to cold and dry, which can be divided into two stages: the warm and wet stage from 9.4 ka BP to 4.2 ka BP, and the cold and dry stage from 4.2 ka BP to now. There are sub-level climatic fluctuations in 6.6-6.2 ka BP, 2.4-2.0 ka BP and 1.7-1.5 ka BP.

Key words: major element, Holocene, environmental evolution, northeastern Tibetan Plateau

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