山西宁武天池区高山湖泊群的形成原因

Origin of the upland lake group in Ningwu Tianchi Region, Shanxi Province

地层、构造和卫星遥感影像证据表明宁武天池区高山湖泊群发育在一个大型向斜核部西缘的NNE向断裂带边缘,湖泊周边出露的基岩中多见小型断层以及由构造挤压/拉张作用引起的垂直节理和岩石破碎现象.据此推测,构造运动可能是宁武天池区高山湖泊群形成的主要驱动因子.代表性湖泊的形成年龄晚于16 ka,意味着致使宁武天池区高山湖泊群形成的构造运动可能发生于晚更新世末.

Stratigraphic, structural and satellite remote sensing images show that the Ningwu Tianchi upland lake group developed in the edge of a NNE thrust fault zone which lies in the western margin of a syncline core, with vertical joints and broken rocks arising from tectonic press/push commonly occurring in the surrounding outcropped bedrocks. Accordingly, tectonic activity is likely to have been the main driving factor that led to the formation of Ningwu Tianchi upland lake group. The age of the representative lake is younger than 16 ka, probably implying that the tectonic activity that had resulted in the formation of the Ningwu Tianchi upland lake group occurred at the late pleistocene.