| Middle-Lower Yangtze Metallogenic Belt is an important Cu-Fe polymetallic metallogenic belt in China.Nowadays,with the rapid development of China's economy and industrialization,the consumption of metal mineral resources is increasing.At the same time,there are fewer and fewer shallow and easy to identify deposits in China after continuous mining,China's import dependence on metal mineral resources is increasing,which indirectly threatens China's national strategic security.Therefore,the prospecting of deep and hidden depostis in China is very important.Middle-Lower Yangtze Metallogenic Belt consists of seven large-scale ore districts,which have been proved to have great metallogenic potential in the deep part of these large-scale districts.Nanling-Xuancheng basin is located in Middle-Lower Yangtze Metallogenic Belt,to the east of the Tongling ore district and to the south of the Ningwu ore district.In recent years,several large and medium-sized polymetallic deposits,such as the Chating Cu-Au deposit and the Magushan Cu-Mo deposit,have been discovered continuously,which shows the great metallogenic potential in the area.Because of the large coverage of Quaternary strata and the low degree of exploration,the deep geological structure of this area needs to be understood more clearly and accurately by more effective exploration means.For Magushan ore field,this study uses the interpretation method of gravity and magnetic joint inversion section to interpret the geological section covering the whole area of Magushan ore field under the constraint of prior geological information.Based on the interpretation section,the 3D geological model of the study area is established,and two sets of verification and modification processes are established,which verify and modify the interpretation section and the 3D geological model respectively.At the same time,based on the ore body model and geological model of Magushan Cu-Mo deposit,the quantitative prediction of 3D mineralization is carried out,and the prospecting target area is delineated according to the favorable degree of mineralization.The following knowledge has been obtained in the research work:(1)Taking the prior geological information as the constraint condition,using the comprehensive interpretation method of gravity and magnetic data is an effective means to understand and understand the deep geological structure of the region.Obtaining the profile can provide the basis for the next modeling work.Using the function of 3D model visualization to verify the accuracy of gravity and magnetic joint inversion interpretation profile can effectively find the inaccuracy of interpretation profile and modify it,so that the interpretation profile has a higher accuracy.(2)By using the comprehensive interpretation method of gravity and magnetic data and the 3D geological modeling method,the shape and extension direction of the main structures in the study area are basically determined;the depth and thickness of the two main depressions in the study area are determined;the distribution range,burial depth and the size and depth of the hidden rock strains in the study area are determined.(3)Using 3D geophysical forward modeling method can effectively verify the rationality of 3D geological model and find the inaccuracy of 3D geological model.And effectively improve the 3D geological model,increase the credibility of the 3D geological model,so as to reduce the error of final metallogenic prediction,and improve the accuracy of prospecting target.(4)Combined with the metallogenic and 3D geological model summarized by predecessors for the clear display of ore-controlling geological body location and shape,using 3D quantitative metallogenic prediction software to extract the ore-controlling indicative elements,predict the areas with large ore-forming potential and delineate the prospecting target area,which can provide reference and suggestions for further deep exploration. |
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