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侯家窑断层是阳原盆地西缘一条区域性正断层,它切割了部分第四纪沉积层,并被马兰黄土所覆盖。具多期次活动的特征,遗留下了丰富的伴生、派生构造形迹。在野外详细观测断层的几何学特征、分析运动学标志的基础上,结合前人研究成果,认为发生了三期构造活动:第一期为区域性拉伸;第二期为短时间区域性挤压;第三期是区域性隆拗。其动力学机制分别为张宣幔枝隆升作用、太平洋板块俯冲的远程效应和汾渭裂谷深部过程控制的断陷-隆升效应。恢复了阳原盆地演化过程:区域性总体快速隆起→构造反转形成裂陷→裂陷加深形成地堑→导致基性岩浆活动→形成区域裂陷地幔底垫→裂谷盆地逐渐形成→构成生物快速演化的一系列构造激变→生态繁衍的大循环系统。
The Houjiayao fault is a regional normal fault in the western margin of Yangyuan basin. It cut some Quaternary sedimentary layers and is covered by Malan loess. With the characteristics of multi-phase activities, left behind a wealth of associated, derived from the structural traces. Based on the detailed observation of the geometric features of the fault in the field and the analysis of the kinematic markers, combined with the results of previous studies, it is believed that the third phase of tectonic activity occurred: the first phase is regional stretching; the second phase is regional short-time squeezing Pressure; the third period is a regional rally. The dynamical mechanisms are the uplift effect of Zhangxuanmen mantle branch, the remote effect of Pacific plate subduction and the fault-uplift effect of the deep process control in the Fen-Fen rift. The evolution of the Yangyuan basin was restored: the regional overall rapid uplift → the tectonic inversion formed the rifting → the rift deepened to form the graben → resulted in the basic magmatic activity → the formation of the regional rift mantle mats → the rift basin gradually formed → the constituent organisms Rapid evolution of a series of structural changes → ecological reproduction of the circulatory system.