Research On The Electrical Structure And Identification Of Datangpo Manganese Deposites In Guizhou Songtao Region

Datangpo manganese deposites in Guizhou Songtao region is important manganese resource base in south China.The only Datangpo Manganese rock is deep-burial and thin-thickness,which brings challenge to geophysical exploration,and the effect of a little Geophysical exploration work is not very ideal.Therefore,geophysical researchs in manganese deposites in Guizhou Songtao Region stay in the backward phase,and there is an urgent need for an effective geophysical prospecting method.Based on a lot of reading literature,geological and geophysical data collection,The paper did a lot of arrangement and analysis summary to dig geophysical prospecting marks of Datangpo manganese,and summarize geoelectric structure characteristics to design reasonable theoretical model in combined with typical geological structure of Manganese-forming sedimentary basin.To carry out forward and inversion simulation calculation to analysis and discuss feasibility and recognition ability of Audio Magnetotelluric in Datangpo manganese deposites.The paper choose High–exploration,better–outcropped,complete-burial Yang Li zhang–SanYang manganese district as the actual research object to carry out comprehensive exploration of AMT and MT,to get deep and shallow,deep and shallow he electrical structure.Then exquisite identification of Manganese layer was realized using the reflection coefficient inversion.Main achievements are the following several aspects:1.The summary of geophysical prospecting marks of Datangpo manganese.Get the comprehensive geophysical characteristics of only manganese rock Nh1d1 of Datangpo manganese is Low-resistivity,High-polarizability,High-density.2.Analysis and summary of electrical structure characteristics in Songtao manganese district.Despite formation is much,Lithology is complex,it is only "high-low-high" three layer structure in the electrical division3.Forward and inversion simulation calculation of characteristic model.In four model,including regional structure,concealed structure,low resistivity thin layer and metallogenic model,the results prove that using different frequency magnetotelluric have ability to identify,but the resolution of the thin layer is not high.4.Processing and 2D inversion of the measured AMT and MT data.We obtained 2.5km electrical structure profile by AMT,and 7km electrical structure profile by MT.Find out the deep structure of Yang Li zhang and San Yang fracture,and a concealed graben is found below the monkey basin in 2km depth as basin depocenter,to provides a good manganese conditions for Yang Li zhang and San Yang fracture manganese basin.5.The exquisite identification of the layers was realized using the reflection coefficient inversion.It revealed the manganese buried conditions of manganese and layers form.In combination with geological and geophysical interpretation result,the paper set up 3D geological structure model in the study area,to analyze prospect of mining miner.