Palynological Evidence for Climatic Changes in Dabuxun Lake of Oinghai Province during the Past 500,000 Years
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摘要: 基于青海柴达木盆地达布逊湖达 1井岩芯样品孢粉分析结果,将孢粉谱划分为Q2 、Q3 和Q4 三个孢粉带;并根据孢粉组合特征讨论了过去 5 0万年中研究区植被演化和古气候变化问题。达 1井沉积剖面年龄根据古地磁测定。研究结果表明,柴达木盆地中更新世中、晚期 ( 5 0 0~ 130kaBP)气候可能为暖温带半潮湿型,晚更新世 ( 130~ 10kaBP)气候为温带半干燥型,全新世 ( 10~ 0kaBP)气候为寒温带干燥型。晚更新世气候变化与青藏高原古里雅冰芯所记录的冷暖事件演变基本一致.Abstract: Based on the sporo-pollen analvscs of the core samples of Corcholc D-1 from the Dahuxun Lakc in the Qaidam Basin of the Qinghai Province, the sporo-pollen diagram may he divided into three palynofloral zones, i.e.Zone Q2,Zone Q3,and Zone Q4.In accordance with the characteristics of the palynofloras} the problems on the vcgctational evolution and the paleoclimatic changes in the past 500 ka were discussed.Ages of the scdimcntarv section of Corcholc D-1 are based on palcomagnetic dating.The results of this study indicate that the middle to late Middle Pleistocene(500-130 ka BP) palcoclimate might he a semi-wet type of the warm-temperate zone the Latc Pleistocene(130-10 ka BP) palcoclimatc might he a semi-arid type of the temperate zone and the Holocene(10-0 ka BP) palcoclimatc might he a arid type of the cool-tcm-pcratc zone in the Qaidam Basin. The Latc Pleistocene climatic changes coincide essentially with the evolution of cool and warm events recorded by the Guliya ice core from the Qinghai-Tibetan Plateau.
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Key words:
- palynoflora /
- paleoclimate /
- paleomagnetic age /
- Quaternary /
- Qaidam Basin
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