重力资料在二连盆地构造单元区划及断裂构造识别中的应用OACSTPCD

Erlian Basin is one of the most important sandstone type uranium resource production base in China.Most of the uranium deposits are concealed paleochannel sandstone type.In order to clarify the geological structure characteristics in the study area and provide exploration directions for uranium resources,this paper used the latest gravity data,and processed it through Bouguer anomaly correction,analytical extension,and total horizontal derivative calculation to obtain geophysical field information related to faults and basin boundaries.The research results revealed that the gravity anomalies in the Erlian Basin have obvious zoning characteristics.Based on the characteristics of gravity anomalies,a total of 48 faults have been inferred,which mainly trending northeast and northwest with the northeast as the main direction.The northwest fault transformed and shifted the northeast fault.Based on the comprehensive research on fault division and basement burial depth,the structural boundaries of Manit Depression,Ulanqab Depression,Sunite Uplift,and Wendu'er Temple Uplift were redefined.Gravity data information showed that the known uranium mineralization were close related to the basin basement uplift and depression and the uranium mineralization mostly distributed at the slope belt in the structural area.Based on the characteristics of geophysical field and inferred fault distribution in the entire region,Manit Depression and Ulanqab Depression were regarded as the favourable prospect area for sandstone type uranium deposits.