Comparison Of Electrical Exploration TE And TM Modes In Typical Lead And Zinc

As one of the sixteen main metallogenic belts in china, Great Khinganmetallogenic belt, occupying600,000km2across the Siberian plate and the northChina plate, is a well-known polymetallic metallogenic belt with silver, copper andzinc.Through a long evolution history, the Great Khingan metallogenic belt shows aspecial geological setting of ore-forming processes. This thesis selected test areadeposit is located in the South Western Greater Khingan Range metallogenic belt ofPb-Zn polymetallic metallogenic belt, which belongs to the typical Yanshan stageskarn type Pb-Zn deposit. It is thus quite significant to the experimental research ofexercising ore-prospecting methods in this area。But the geological conditions iscomplex, the carbonaceous strata and skarn veins associated, brought greatinterference factors to electrical prospecting. As TE mode and TM mode in electricalprospecting have their own strengths and limits, different ways of installation differ inthe results according to the geological environment field and exploration requirements,especially it will be affected to varying degree by anisotropic effects, field source andother factors under the geological environment with the good conductive. Therefore,the comparison research of electrical prospecting method in skarn type Pb-Zn depositwill provide corresponding geophysical exploration modes and examples for theexploration of such poly-metallic metallogenic deposit, ore body and similarmetallogenic deposit and ore body.The thesis starts with a detailed introduction to the regional geologicalbackground of the testing area, geological background of the mining area and thegeological features of the ore body. Based on abundant data obtained from geology,exploration, and geophysical prospecting, combining mining rock (ore) stoneelectrical characteristics, the geological and metallogenic theory as the guide, it buildsa two-dimensional lead-zinc geophysical model of the testing area. With the aid of thegeophysical exploration theories and introduction of the geophysical model, it brieflydescribes some important formulas and principles of the TDIP and CSAMT. And it isalso to introduce briefly and compare some frequently-used forward and inversionmethods, choose some comparatively mature commercial software along the trail, and propose a TDIP and CSAMT numerical modeling on the geophysical model of orebody, then it compares the effect of modeling results under TE mode and TM mode,and analyzes the anomaly features of the lead-zinc ore body geophysical model in thetesting area and pros and cons of different prospection modes. On the basis of the fieldtesting data and comparison of exploration effects under TE mode and TM mode, itfinally proves the strengths and limits and comes to a conclusion of the electricalfeatures of lead-zinc ore body in the testing area and geological significance.Finally it summarizes the last conclusion and indicates the limits of the researchwork and highlights the efforts and suggestions of the future.