| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
WANG Lixin, DAI Youxu, WANG Lipeng, WANG Qingtong, YAN Kun, JIANG Wenqin. 2023. Characteristics and indication on palaeoclimate of sporopollen assemblages of Mid- to Late- Pleistocene in Sepabayi- Keping Area, Xinjiang[J]. Geology in China, 50(4): 1268-1276. doi: 10.12029/gc20210422001
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Characteristics and indication on palaeoclimate of sporopollen assemblages of Mid- to Late- Pleistocene in Sepabayi- Keping Area, Xinjiang
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Abstract
This paper is the result of environmental geological survey engineering.
Objective The study of paleo-environmental changes of Mid-to Late-Pleistocene in northwest Tarim Basin is relatively weak. As a sensitive area to climate and environmental change in Asia, the paleoenvironment study of the Southwest Tianshan is of great significance for predicting future climate. The succession law of palaeo-vegetation indicated by the characteristics of palynological assemblage has become an important problem to be solved urgently in paleoclimate research in this area.
Methods Based on palynological identification and photoluminescence dating of typical river terrace samples from Sepayi-Keping area, Xinjiang, the characteristics of palynological assemblages in the Mid-to Late-Pleistocene and their implications for paleoclimate were discussed in this paper.
Results Three palynological assemblages of Mid-to Late- Pleistocene were divided. Palynological assemblage zone Ⅰ: Quercus-Graminae- Chenopodiaceae; Ⅱ: Ephedra-Betula-Labiatae; Ⅲ: Pinus-Ephedra-Chenopodiaceae.
Conclusions They indicate the arid climate of the Southwest Tianshan and the fluctuation trend (dry and cold-warm and wet-dry and cold) during Mid-to Late-Pleistocene. During 65-16 ka before present, there was an obvious humid climate stage with abundant precipitation. The terraces formed by river downcutting were controlled by both tectonic and climatic factors.
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WANG Lixin, DAI Youxu, WANG Lipeng, WANG Qingtong, YAN Kun, JIANG Wenqin. 2023. Characteristics and indication on palaeoclimate of sporopollen assemblages of Mid- to Late- Pleistocene in Sepabayi- Keping Area, Xinjiang[J]. Geology in China, 50(4): 1268-1276. doi: 10.12029/gc20210422001
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Figure 1.
Location of the study area
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Figure 2.
The measured section of the Meso-Upper Pleistocene alluvial deposits in the Sepabayi area, Xinjiang
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Figure 3.
Palynological map of the Mid- Late Pleistocene in Sepabayi, Xinjiang (All are amplified by 800 times)
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Figure 4.
Palynological map of the Mid- Late Pleistocene in Keping, Xinjiang(All fossils are preserved in the Department of Earth Biology, China University of Geosciences. The scale in the map represents 20 μm)
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Figure 5.
Palynological map of the Middle- Late Pleistocene in the Sepabayi- Keping area, Xinjiang