摘要
民乐盆地位于甘肃河西走廊的中部,南北分别为祁连山和龙首山所夹持,而东西又分别为大黄山隆起和榆木山隆起所围限。该区地质构造和地貌类型复杂多样,近年来地震的活动也较为频繁,是河西走廊诸盆地中活动性较强的盆地之一。本文通过对民乐盆地及其邻区若干构造地貌类型和特征的分析,并在活动性断裂、深部构造背景的研究基础上,对该区的构造地貌发育史以及构造与地震的关系等问题进行了初步的探讨。
This paper deals with some geomorphotectonic types observed in Minle basin and its neighborhood that are described. They include the trellis and parallel drainage patterns, fault block mauntain, dislocation basin, river terrace, as well as faulted triangular facets and trapezoidal facets etc. The development of the multiple beveling planes occurring in the area under investigation may be subdivided into three different stages. Some major geomorphotectonic type related to recent seismic activities and their evolutions are preliminarily discussed here.It is revealed that the different geomorphotectonic types and their devolopment history are controlled by some fault zones with various trends and different degree of activity. Consequently, the existence of the multiple beveling planes as well as the appearance of recent seismic activities and neotectonic faulting are closely associated with the revival of old faults.
出处
《甘肃地质》
1989年第10期88-99,T001,共13页
Gansu Geology
