【摘要】 通过对云贵高原西北部鹤庆钻孔古湖相沉积岩芯的粒度、碳酸盐含量和烧失量等指标的综合分析、研究,重建了鹤庆盆地2．78 Ma以来的古环境演化过程．岩芯磁性地层表明,鹤庆湖盆形成于约2．78 Ma．环境代用指标的综合分析显示:鹤庆盆地2．78 Ma以来有过三次大的环境转变,即2．65 Ma鹤庆湖盆积水成湖,1．55 Ma、0．99 Ma左右山盆高差两次加大,这分别与青藏运动B幕、C幕和昆黄运动耦合．更多还原

【Abstract】 Based on multi-proxy investigations such as grain size, content of carbonate and loss on ignition of the deep core of the ancient lake in the Heqing basin, the northwest of Yungui Plateau, it is reconstructed for a 2. 78 Ma paleoenvironmental evolution. The result of magnetic stratum indicates that the Heqing lake basin was formed at about 2.78 Ma. Further, the multi-proxy analysis reveals that there had been three major environmental stages in the Heqing basin since 2. 78 Ma, namely the lake basin accumulated water to be a lake in 2. 65 Ma,and the height difference between the mountains and basin increased twice at about 1. 55 Ma and 0.99 Ma. These stages couples well with Qingzang movement phase B, phase C and Kunlun-Huanghe movement respectively.更多还原