Abstract:

Distribution of metallogenic belt is controlled by geological structures that can be delineated by gravity and magnetic
anomalies. In order to study the relationship between gravity, magnetic anomalies and mineralization belt in the central segment of the Qinling orogenic belt , we collected and processed the gravity and magnetic survey data of the Qinling orogenic belt. We also analyzed and interpreted the distribution characteristics of gravity and magnetic anomalies and inferred fault structures in the study area. In addition, we discussed the undulation characteristics of crystalline basement and the connection among gravity and magnetic anomaly characteristics, geological structures and metallogenic belt, together with regional geology and deposit distribution. This study shows that most of the deposits are located within zones of high gravity and magnetic anomaly gradient or intersections of several groups of anomalies in different orientations, especially in local high gravity anomaly range and along edges of a gradient belt. The results of this research are useful for studying geological evolution of the Qinling orogenic belt, geological structures (especially in deep structures),fracturedistribution.Thefindingswillalsoprovideanimportantreferenceforpredictingfavorableareasofmineralization .

Key words: Qinling orogenic belt；gravity and magnetic anomalies；fault structure；metallogenic belt