Characteristics of deep geological structure of Lang-shan metallogenic belt in Inner Mongolia
ZHANG Zhenyu1,2, HU Xiangyun3, WANG Gang1,2, LI Yongbo1,2
1. National Modern Geological Exploration Engineering Technology Research Center, Langfang, Hebei 065000, China; 2. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang, Hebei 065000, China; 3. China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China
Abstract:The special tectonic position of the Langshan metallogenic belt leads to its completely exposed strata,frequent magma activities,and complex structure. Affected by natural conditions and other factors,there is little deep geophysical exploration in Langshan metallogenic belt. The features of the deep geological structure are less studied generally,and the research on regional deep structural characteristics is not deep. To study the deep geological structure of the Langshan metallogenic belt,this paper utilizes the results of two comprehensive geophysical survey profiles of the magnetotelluric sounding and the gravity and magnetic detection perpendicular to the main geological structure strike. In combination with the geological data,the deep geological structure characteristics of the Langshan region are deeply studied and the following knowledge is obtained. First,nine fractures (F1-F9) are identified. Specifically, F1 is the intersection of the Urad Houqi-Huade-Chifeng deep fault zone and Wendur Temple-Xilamulun River deep fault zone,and it is also the suture zone of the North China plate and Siberia plate. Second,many high-resistance and high-magnetic bodies are found,which are magmatic rocks or the comprehensive reflection of magmatic rocks with Paleozoic,Proterozoic,and Archean strata. Third,it features low resistance between F7 and F4,between F2 and the southeast end of section Ⅰ,and between F1 and F3,which is the reflection of Mesozoic and Cenozoic fault basins. Fourth,Baoyintu uplift is located between deep faults F4 and F5 with high-density bulges at both ends,and the inversion resistivity is characterized by high resistance and low resistance on both sides. Influenced by F4 and F5,Baoyintu uplift has developed internal secondary faults,with multiple magmatic intrusions. Fifth,there are obvious wavy density anomalies on both sides of F1,which are caused by the folding structure formed on both sides of the suture zone between the North China plate and the Siberia plate. Sixth,huge low-resistivity anomalies develop at the depth of more than 10km in F1 and 20 km in F1 and F9. The upper part of these anomalies is upright,and the lower part is inclined to the north and can extend downward below the Moho surface. It is inferred that the low-resistivity anomalies are magma soft fluids (or magma channels) upwelling from the mantle,which provides deep geological conditions for magma overflow and deep mineralization.
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