Fault Interpretation Of The Eastern Section Of The Sino-mongolian Boundary Based On Gravity Data

The Sino-Mongolian border area spans the junction zone between the North China Block and the Siberian Block and is composed of a series of magmatic rock belts and fault zones.The magmatic activities in this area are frequent and intense,which forms the material basis for the formation of abundant endogenous metallic mineral resources.After years of exploration and research,it is found that there are many kinds of metallic mineral resources in this area,and its formation mechanism is closely related to the fault zones.Therefore,the analysis of the characteristics of the fault zone can provide support for the delineation of metallogenic prospective areas in the next step.However,due to the influence of geological processes in different periods,the geological geomorphology and structure in this area are relatively complex,so there are still many deficiencies in the understanding of fault zones in this area.In view of the current situation of insufficient understanding of fault zones,this paper processed and analyzed the profile data actually measured by the research group in the study area,combined with the existing geological and other geophysical data,provided new understanding of fault zones,and provided technical support for the subsequent ore prospecting work.In this paper,the Bouguer gravity anomaly is obtained after topographic correction and Bouguer correction based on the 1:25000 high-precision gravity data of three profiles actually measured in the study area,and the two-dimensional inversion results of Bouguer gravity anomaly are given.Contains information because of the bouguer gravity anomaly is more,the shallow fault information is not obvious,in order to highlight the fault zone in the study area of gravity anomaly information and its lateral variation in shallow.The Bouguer gravity anomalies of three profiles were separated into deep field sources by curve fitting,given the corresponding2 d inversion results,identify the location of the fracture from the inversion results,gravity anomaly characteristics and metallogenic mechanism,etc.The R coefficient correlation method is applied to treat the area through which the faults pass,so as to understand their spatial occurrence state and prepare for the next step of fault interpretation and metallogenic mechanism.Based on the processing and analysis of gravity data,the main conclusions are as follows:the first section passes through four main faults,and the faults strike east-west near the profile.The two main faults develop 10 secondary faults where the profile passes,and the main faults extend to the north and south sides in depth respectively.The second section passes through two main faults and six secondary faults.The two main faults are NE-trending,and one of them extends to the south in depth.The third section crosses five main faults and six secondary faults.The main faults are all NE-trending,of which four main faults tend to the south and one main fault tends to the north.Finally comprehensive processing result of three section,combined with the existing related data in the study area,the study area,the formation of the seven deep fault belt,the structure of the main faults and secondary faults relationship and its formation reasons such as the gravity anomaly explanation respectively.