| The pre-sinian of central Yunnan mainly located in the southwestern margin of the Yangtze block, east of Yuanmou-Luzhijiang fault, and west of Puduhe-Dianchi fault, the crustal structure is complex, it has characteristics of multilayer structure ". The lead-zinc deposit metallogenic region deposit (point) has nearly twenty In the Kunyang group, the ore bearing strata are mainly as follows:the Dalongkou group (Pt2d), Heishantou group (Pt2hst), Etouchang group (Pt2e).This work selected occurs in Kunyang group’s Daxiao, Reshuitang lead-zinc deposits were detailed field geological survey. By the study of typical lead-zinc deposits in the metallogenic geological background, geological characteristics of the deposit, fluid inclusion characteristics, element geochemistry, isotope geochemistry, geochronology, combined with Yunnan in the pre Sinian lead-zinc metallogenic domain lead-zinc deposits (points) of space distribution, Fu of ore bearing strata, ore bearing lithology and structure factors analysis. The following main conclusions are obtained in this paper:1. In the study area, tectonic magmatic activity, metamorphic complex, mine lead-zinc ore body mainly existed Heishantou group (Pt2hst), Etouchang (Pt2e) in carbonate rocks, the selected typical deposit mainly stratoid, vein, lenticular.2. Ore mineral composition is relatively simple, the main mineral galena:sphalerite, pyrite, chalcopyrite, secondary minerals in the ore:limonite, lead, cerussite, smithsonite, psilomelane, malachite etc.. Ore structure mainly are:self hypautomorphic xenomorphic granular structure, corrosion residual structure, metasomatic relict cross structure, opaque like structure, leaf like structure, changing crystal structure, cataclastic structure, matrix structure, exsolution structure, mesh structure, crumple structure, cementation structure, metasomatic relict block structure, crystal structure, metasomatic textures-containing structure.3. Rock alteration mainly:silicification, pyritization and carbonatization, baritization, dolomitization.4. Daxiao and Reshuitang lead-zinc deposits of sulfur, isotope has the characteristics of multi sources, Daxiao ore lead came from the mantle and orogenic belt, Reshuitang ore lead source in the upper crust and orogenic belt, according to research and single mineral, Sr-Nd isotopes, the Daxiao Pb-Zn metallogenic material may mainly derived from ore bearing carbonate rock or basement strata, and deep fluid involved in mineralization, and Reshuitang lead-zinc deposit calcite from crustal source. The metallogenic epoch is roughly equivalent to the late Indosinian early Yanshan period.5. Fluid inclusion geochemistry showed in central Yunnan pre-sinian metallogenic region lead-zinc metallogenic fluid is:in low temperature, low salinity, in low density, shallow layer metallogenic characteristics.6. The characteristics of lead-zinc deposit in central Yunnan area with multi stages and multi sources of ore-forming material, in the role of strong tectonic activities in Indosinian period, the deep magma and magmatic hydrothermal migration along the fracture early structure formation, and the ore-forming material of strata in the ore extraction, gathered in the right position. |
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