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Geoscience ›› 2023, Vol. 37 ›› Issue (04): 870-880.DOI: 10.19657/j.geoscience.1000-8527.2022.037

• Stratigraphy • Previous Articles     Next Articles

Middle Late-Pleistocene Sporopollen Records of Ake River III Terrace in Southern Margin of Aba Basin, Western Sichuan

ZHU Ting1,2,3(), HE Zhengwei1(), YANG Zhenjing2,3, KANG Guichuan1, GUAN Sensen1, ZHU Yuting1   

  1. 1. College of Earth Sciences, Chengdu University of Technology, Chengdu, Sichuan 610059, China
    2. Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, Hebei 050061, China
    3. Key Laboratory of Quaternary Geochronology and Hydrologic Environment Evolution, China Geological Survey, Shijiazhuang,Hebei 050061, China
  • Received:2021-11-04 Revised:2022-06-28 Online:2023-08-10 Published:2023-09-02

Abstract:

Vegetation growth and change have important implications for climatic evolution. In this study, we used sporopollen record to reconstruct paleovegetation and paleoclimate. Based on the sporopollen study of the Ake River III-level terrace in the southern margin of Aba basin in western Sichuan (eastern Qinghai-Tibet Pla-teau)and OSL dating, the results show that PM01 is (78.4±7.1) to (71.6±6.2) ka B.P. (middle Late Pleistocene). According to the palynological assemblage and mathematical analysis, the PM01 profile was divi-ded into three palynological zones. The results show that vegetation in the Aba Basin was sparse forest and grassland from (78.4±7.1) to (71.6±6.2) ka B.P. in the middle Late Pleistocene. The paleoclimate evolution can be divided into three stages: (1) cold and arid; (2)warmer than the first stage, but still cold and dry; (3)warmer and then cooler and drier. The results are consistent with the climate evolution trend of the last ice age, and provide new data for the study of the Quaternary regional vegetation and climate evolution, which is of great significance for studying Quaternary paleoclimate in the eastern Qinghai-Tibetan Plateau.

Key words: pollen, Western Sichuan, third-level terrace, Paleoclimate

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