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《Acta Sedimentologica Sinica》 2001-01
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Palynological Evidence for Climatic Changes in Dabuxun Lake of Qinghai Province during the Past 500,000 Years

JIANG De xin YANG Hui qiu (Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000)  
Based on the sporo pollen analyses of the core samples of Corehole D 1 from the Dabuxun Lake in the Qaidam Basin of the Qinghai Province, the sporo pollen diagram may be divided into three palynofloral zones, i.e. Zone Q 2, Zone Q 3, and Zone Q 4. In accordance with the characteristics of the palynofloras, the problems on the vegetational evolution and the paleoclimatic changes in the past 500 ka were discussed. Ages of the sedimentary section of Corehole D 1 are based on paleomagnetic dating. The results of this study indicate that the middle to late Middle Pleistocene (500~130 ka BP) paleoclimate might be a semi wet type of the warm temperate zone, the Late Pleistocene (130~10 ka BP) paleoclimate might be a semi arid type of the temperate zone, and the Holocene (10~0 ka BP) paleoclimate might be a arid type of the cool temperate zone in the Qaidam Basin. The Late Pleistocene climatic changes coincide essentially with the evolution of cool and warm events recorded by the Guliya ice core from the Qinghai Tibetan Plateau.
【Fund】: 中国科学院兰州地质研究所所长基金资助项目! (编号 :E97 0 7 0 1 )
【CateGory Index】: P532
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