The Detection Effect of Ultra-high Density Resistivity Method and Audio Magnetotelluric Sounding Method for a Fluorite Mining Area in Pu'an,Guizhou Province
In this paper,the fluorite metallogenic fault in a survey area of Lianhuashan,Pu'an County,Guizhou Province,is studied by using ultra-high density resistivity method and audio magnetotelluric sounding method to measure the same fault.The plane distribution and deep extension of the fault are found out,and the three-layer electrical structure of"low resistance-medium resistance-high resistance"from Emeishan basalt formation to Maokou Formation is revealed.Based on the medium resistance characteristics of the contact zone of Emei Mountain basalt formation and Maokou Formation,combined with the fault extension,the buried depth range of fluorite ore body is inferred and verified by drilling.The two methods have good effect on the fault de-tection,but also have advantages and disadvantages.The ultra-high density resistivity method has shallow detec-tion depth and high measurement accuracy,but it is prone to a variety of non-target anomalies.The audio mag-netotelluric sounding method detects deep depth,but the resolution of shallow part is poor,and the measurement accuracy is low.In practice,we should choose the appropriate working method or combine the two methods ac-cording to the buried depth of the exploration target in order to achieve more reliable geophysical interpretation results.
Ultra-high density resistivity methodAudio magnetotelluric soundingFluorite oreFaultElectrical structure
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