Abstract: The Daqingshan Mountains and its adjacent Huhehot fault basin, Nei Monggol, are the ideal area to study denudation and uplift. By means of morphomeric analysis and field observation, this paper provides evidence for arching deformation of four accordant summit levels aged in Oligcene, Miocene, Plicene, and Quaternary stream terrace flights. On the basis of the result of seismic surveying for the Huhehot basin, the average Cenozoic denudation and crustal isostatic uplift amounts are estimated to be 3 310m and 2 910m, respectively, for the Daqingshan Mountains. It is thus evident that the resulting relief lowering due to denudation after crustal isostatic uplift is really slight, only 400m. For the denudation of the Daqingshan Mountains, obviously strenthening with time resulted from the long term climatic change during the Cenozoic era. The crustal isostatic uplift is a principal regional deformation mechanism for the Daqingshan Mountains. First, the crustal isostatic uplift controls the Cenozoic landscape evolution history. Second, the rate of the crustal isostatic uplift of late Quaternary has been quicker from the western part to the eastern of the Daqingshan Mountains. And third, the amount of the Quaternary crustal isostatic uplift of the Daqingshan Mountains is greater than the Ordos'tectonic uplift by one order. A close coupling relation between denudation to lose gravity equilibrium and crustal isostatic uplift to restore gravity equilibrium runs through the Cenozoic land evolution history of the Daqingshan Mountains. The faulting has a different position before and after the establishment of the coupling relation. And the flexural isostatic has accommodated long term local differential movement on the fault zone.

Key words: Nei Monggol, Daqingshan Mountains, Denudation, Crustal isostatic uplift

摘要： 内蒙古大青山及其毗邻的呼和浩特断陷盆地是研究剥蚀和地壳均衡隆起的理想地区。本文提供了大青山新生代等高峰顶面和晚第四纪河流阶地拱曲变形的证据;依据呼和浩特盆地的地震探测获得的沉积厚度,计算出大青山的剥蚀和地壳均衡隆起量;提出地壳均衡隆起是大青山晚第三纪以来主要的区域变形机制;指出由於地壳均衡隆起,剥蚀作用最终只是使大青山高度略微降低;同时复原了大青山新生代景观演化历史。本文还讨论了剥蚀和地壳均衡隆起之间的耦合关系以及断裂作用在其中的地位,认为大青山新生代景观演化是在剥蚀去荷失去重力平衡和均衡隆起恢复重力平衡的长期自身耦合作用中进行的,在此过程中断层的下降盘由主动盘变成被动盘。

关键词: 内蒙古, 大青山, 呼和浩特断陷盆地, 剥蚀, 地壳均衡隆起