The generation of the new Huaxia system structure

The Qixia compound fold is the main body of the east-west structure, and the faults associated with the fold are mostly compounded, pulled, and reformed by the late New Cathaysian faults. Direction. The Neo-Cathaysian structure is the main ore-controlling structure in the mining area, which can be divided into early and late phases according to its generation time. The Early Neo-Cathaysian fault was produced in the Jurassic northeast trending structure, which was formed under the pressure of the northwest-southeast lateral pressure. The Huangye arc faults and Zhaoping faults have opposite tendencies. As a result of the lateral compressive stress acting on the Linglong granite, a conjugate shear system on the profile is formed. The Neo-Cathaysian structure is a north-north-east trending fault generated since the Cretaceous Period, which is often superimposed on the Early Neo-Cathaysian fault. East-west deflection. The measurement and research results in recent years show that the horizontal tectonic stress plays a leading and controlling role in the present geostress field.

The direction of the maximum horizontal principal stress in the present geostress field mainly depends on the present tectonic stress field, and there is no inevitable connection between it and the tectonic stress field that has appeared in geological history. Only when the current stress field develops following the previous stress field or is coupled with the direction of a historical tectonic stress field, the direction of the current horizontal principal stress may be related to the historical geological tectonic elements. The new and old tectonic systems in China are often closely related. The new tectonic system has inheritance to the older tectonic system, and at the same time shows a new role, giving birth to new tectonic traces.