Three-dimensional Prediction Study Of Datangpo Type Manganese Deposits In Xiushan, Chongqing

The “triangular” area where on the margin of the Yangzi platform,bordering the Guizhou,Chongqing and Hunan provinces,is one of China's important manganese resource-rich regions.Where the rhodochrosite is more common,and the scale of its deposits is mostly large and medium size.Now it has become the most important manganese type in China with the largest potential for resources.These manganese deposits are basically produced in the black rock series of the Datangpo Formation in the Nanhua System.This type of manganese deposit is usually referred to as the Datangpo type manganese deposit.In order to meet China's demand for manganese deposits,on the one hand,it is necessary to strengthen the mining efficiency;on the other hand,geological workers are required to use new methods and new technologies for deposit exploration.With the development of GIS,modern quantitative prediction method has been widely used in the current two-dimensional plane metallogenic prediction research with its quantification and refinement characteristics.In order to effectively apply the theory and method of quantitative assessment of mineral resources to deep ore prediction,two-dimensional space must be developed into three-dimensional space in order to achieve the quantitative forecasting requirements for deep-lying concealed orebody.Many geologists have conducted a large number of three-dimensional geological modeling techniques based on three-dimensional metallogenic prediction methods.This paper takes the Xiushan area of Chongqing as the research area,takes the Datangpo Formation manganese deposit as the research object,adopts advanced international 3D geological modeling technology,and applies the theory of mineral resource prediction from the two-dimensional space to the three-dimensional space,completing a set of three-dimensional modeling route and deposit prediction method suitable for this study.The following results are obtained:1)Through the collection and arrangement of relevant geological data in the study area,the geological features of Datangpo type manganese deposit have been mastered.Based on the specific conditions of this study area,GOCAD was selected as a software platform to determine a set of three-dimensional geological modeling routes using stratigraphic profiles and prediction methods through the combination of knowledge and data drive.2)Using the geological section modeling method as the guiding principle,combining the geological characteristics of the study area,making full use of the characteristics of the plane geological map and the cut section,26 cross-sections perpendicular to the overall stratum are drawn,and a three-dimensional geological model of the study area is established using the continuity and systematism of 26 cross-sections.3)By analyzing the geological characteristics of the deposits in a typical mining area,the ore-finding indicator is determined,and a conceptual model of the ore-controlling factors in the study area is established.Combined with the knowledge of the Datangpo-type manganese deposit,quantitative analysis of ore-controlling factors is completed.4)According to the quantitative analysis of ore-controlling factors,the related data of ore-controlling factors are converted into ore-controlling degree values,and the probability of metallogenic formation is calculated.Finally,the results are verified and analyzed.The conclusion is showed as follow: When the metallogenic probability is or more than 0.6,the three-dimensional spatial position where the small and medium-sized mining area is located can be circled;when the metallogenic probability is or more than 0.8,the three-dimensional spatial position of the medium-sized ore deposit can be circled.