漳卫河流域中更新世晚期以来沉积物特征及古环境分析

Sediment of the Early Middle Pleistoch in the Zhangwei River Basin and Palaeoenvironment Analysis

通过漳卫河流域ZKD-3钻孔前78.6 m沉积物的光释光测年结果和粒度、磁化率测试结果进行分析,还原了漳卫河流域220 ka B.P.以来的古环境的演化历史。根据测试结果,可将漳卫河流域220 ka B.P.(距今220千年)以来古环境分为5个变化阶段:223.4~196.5 ka B.P.气候温暖湿润;196.3~187.3 ka B.P.气候开始转向寒冷干燥;185.6~87.4 ka B.P.气候为寒冷干燥,并逐渐转向温暖湿润;84.5~12.6 ka B.P.气候整体为寒冷干燥;9.87~0.68 ka B.P.经历了温凉略干→温暖湿润→温凉偏干。漳卫河流域的气候演化既具有全球气候变化一致性特征,同时也受区域特征的影响。

Based on the analysis of OSL dating, grain size, mineral-magnetism measurement, the evolution of paleoenvironment of Zhangwei River basin was restored since 220 ka.B.P.. Sediments were sampled from the depth 78.6 m in the Zhangwei River Basin. The evolution processes was divided into the following 5 periods. During 223.4 ka B.P. to 196.5 ka B.P., the climate was warm and humid in this period. Then, in 194.62 ka B.P. to 187.33 ka B.P., the climate turned into cold and dry. In the period of 185.6 ka B.P. to 87.4 ka B.P., the climate was cold and dry, while gradually getting warm and humid. In the period of 84.5 ka B.P. to 12.6 ka B.P., the climate was cold and dry generally. In 9.87 ka B.P. to 0.68 ka B.P., the climate got warm and wet and in this period the climatic changed. It was slightly cold and moderately dry at the first, then, turned to warm and humid, next warm and humid, finally, it was slightly worm and moderately dry. The results show that climate evolution is not only consistent with the characteristics of the global synchronization, but also affected by the characteristics of the region.