摘要
根据渭河盆地断裂系统走滑切错关系,将渭河盆地断裂系统分解为五种断裂运动学体制。第一种是东西向左行走滑运动体制,是秦岭走滑向北的逐级传递,也是导致渭河盆地扩展的重要模式;第二种是北西-南东走滑系是鄂尔多斯块体内部的相对运动体制,可能和鄂尔多斯盆地的挤压蠕散有关系;第三种是口镇右行,六盘山挤压运动体制,可能代表了六盘山造山导致的鄂尔多斯地块相对东移甚至旋转;第四种是东秦岭的南北挤压运动体制,和川东北向秦岭的挤压有关系,导致秦岭北缘断裂的强烈弯折,并维持了华山、崤山的相对隆升状态;第五种是中秦岭动力楔挤压运动,和目前的GPS数据反映的规律一致,代表了目前的渭河盆地整体上呈现挤压汇聚状态。这五种运动学体制可以轮流发生在渭河盆地形成与发展过程中,形成不同体制"轮流值班"的态势,多种运动学机制和动力学模式可以"轮流值班"、"此消彼长"。
According to the cutting relationship and strike-slip amount of fault system in Weihe Basin, we decomposedthe fault system into five kinds of fracture kinematics systems. The first is a left strike-slip movement system, whichis the strike slip transmitting of Qinling Mountain to the north step by step. It is also an important model to lead to theextending of the Weihe Basin. The second is the NW-SE strike-slip system, which is the relative motion of the OrdosBlock internal system, and it may be related to compressed creep scattered of Ordos Basin. The third is a rightmovement of Kouzhen and extrusion motion of Liupanshan system, which represent eastward movement or rotation ofOrdos Block caused by Liupanshan Mountain orogenic. The fourth is the extrusion movement system of EasternQinling, which has relation with extrusion from northeast Sichuan to Qinling Mountain. And it caused strong bendingof the northern margin fault in Qinling Mountains and maintained the relative uplift of Huashan and Xiaoshan. Thefifth is dynamic wedge extrusion of Qinling Mountain, which is consistent with the current GPS data. And it representthe current state of extrusion and convergence of the Weihe basin as a whole. The five kinds of kinematics system cantake turns in the formation and development process of the Weihe Basin to form the different system of “take turns onduty”. The variety of kinematics mechanism and dynamics model can “turn on each other“and “shift in time”.
作者
白相东
关成尧
张艳
袁四化
刘晓燕
Bai Xiangdong;Guan Chengyao;Zhang Yan;Yuan Sihua;Liu Xiaoyan(Institute of Disaster Prevention,Sanhe 065201,China;Institute of Engineering Mechanics,China Earthquake Administration,Haerbin 150080,China)
出处
《防灾科技学院学报》
2018年第3期8-16,共9页
Journal of Institute of Disaster Prevention
基金
中国地震局教师科研基金(20150104)
国家自然科学基金面上项目(41772200)
