AEOLIAN DEPOSIT EVIDENCE FOR FORMATION AND EVOLUTION OF THE TENGGER DESERT IN THE NORTH OF CHINA SINCE EARLY PLEISTOCENE
AEOLIAN DEPOSIT EVIDENCE FOR FORMATION AND EVOLUTION OF THE TENGGER DESERT IN THE NORTH OF CHINA SINCE EARLY PLEISTOCENE
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发表时间：
2006
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通讯作者：
Yang Dong;Fang Xiao-min;Dong Guang-rong;Peng Zi-cheng;L. Jijun
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作者：
Yang Dong;Fang Xiao-min;Dong Guang-rong;Peng Zi-cheng;L. Jijun
六盘山以西陇西盆地山前断县剖面黄土-古土壤序列的古地磁极性反转、磁化率和粒度分析结果表明，该层序包含了黄土-古土壤标准剖面1.8MaBP以来所记录的大部分地层单位作为荒漠化程度和荒漠化程度的代用指标，初步发现在过去的1.8Ma中，腾格里沙漠发生了两次重要的气候事件，分别发生在1.1MaBP和0.8MaBP左右，腾格里沙漠的逐步推进和变化可能与晚新生代全球冰量增加、季风变化和青藏高原隆升有密切关系。
Analyses of paleomagnetic polarity reversals,magnetic susceptibility and grain size on the loess-paleosol sequence of Duanxian section,about 223 m thick,at a pediment of Longxi basin lying to the west of Liupan Mountain,show that this sequence contains most of the stratigraphic units recorded in the standard loess-paleosol section in the China Loess Plateau over the past 1.8 MaBP.Using sand particle percentage(63 μm%) of the eolian sequence as a proxy indicator of desert extent and aridity in the dust source regions,the authors preliminarily found that during the past 1.8 Ma,there were two important climatic events indicating the advance of the Tengger Desert.The events occurred around 1.1 and 0.8 MaBP,respectively.The stepwise advance and changes of the Tengger Desert may have a close relation with the increase in global ice volume and monsoon change and uplift of the Tibetan Plateau in the late Cenozoic.