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通过金丁剖面黄土地层410组土样的磁化率、粒度和有机碳的测试数据,并结合年代学数据资料,对该地区末次冰期期间的古气候变化特征进行了相关分析。结果表明:该地区黄土剖面较完整地记录了末次冰期的气候变化。其末次冰期沉积由2层厚层黄土夹1层弱土壤化古土壤组成,其中L1SS1又可分为3层古土壤夹2层黄土;末次冰期期间,该区经历了3个气候变化阶段:干冷-温凉湿润-干冷的过程,气候变化由L1-3的显著干冷到L1-2的气候较为温凉湿润,再到L1-1的显著干冷气候变化,且气候变化的时间节点大约在43.0ka和27.4ka。
Based on the data of magnetic susceptibility, grain size and organic carbon of 410 samples from the loess formation in the Jinding section, the correlation analysis of the paleoclimate changes during the last glacial period in the area was made based on the chronological data. The results show that the loess section in this area recorded the climatic changes in the last glacial period more completely. Its last glacial deposition consisted of 1 layer of weakly clayey paleosol with two layers of thick loess clip. Among them, L1SS1 was divided into 3 layers of paleosol with 2 loess layers. During the last glacial period, the area experienced three stages of climate change: dry and cold - cool and humid - dry and cold process, climate change from significant cooling L1 - 3 to L1 - 2 climate is more cool and humid to L1 - 1 significant dry and cold climate change, and climate change time node about 43.0ka And 27.4ka.