| Qinglong antimony ore field is important antimony locality in west-south depression of Quizhou province.The predecessors' researches on Qinglong antimony ore field structural were focus on interlayer-gliding, karst and unconformity. But those researches were behindhand on mine field structural evolution and ore-control action. On research on metallogenic fluid, the predecessors' researches were always adopted veinstone minerals as objects, so they often neglected effect of water-rock reaction of metallogenic fluid. And, they often suggested the source of metallogenic according characteristics of metallogenic fluid In this paper, obtain new recognition on characteristics of mine-field structure ore-controlling, geochemistry of ore deposit and metallogenic fluid geochemistry on the basis of researching of antimony ore field of Qinglong antimony field structural characteristics, geochemistry of ore deposit, fluid geochemistry, according to structure analysis, petrological, geochemistry, fluids inclusions geology, electron probe-microanalysis, X-ray diffraction analysis, stable isotopes and radioactive isotope etl. as the research methods. By researching and discussing the coupling of metallogenesis and the ore-forming fluid, genetic the metallogenetic model of Qinglong antimony ore field.(1) It can be concluded that Qinglong antimony ore field have complex semi-graben assemble patter and redefined the old uplift of Dachang by researching separately configurations antimony ore field of Qinglong. The characteristics of structure controlling exhibited that:it has fractionation and equidistant on ore controlling. old uplift, paleokarst unconformity and complex semi-graben are the best geotictonic settings of ore formation. The fracture zone and paleokarst-unconformity are good for migration and fitting of ore-fluid. NE trending fracture have important effects in the the mineralization.(2) We can achieve new cognition on the geochemistry characteristic of metallogenic fluid of Qinglong antimony ore field based on the research on deposits, surrounding rocks, ores, normal and trace elements and fluid inclusions. The result of the research shows that the metallogenic fluid of Qinglong antimony ore field have the characters like reformed type strata-bound ore deposit metallogenic fluid:low homogenization temperature of fluid, range from 125 to 200℃, low liquid density (0.88 to 0.95g/cm3). Metallogenic fluid belong to Ca2+—Na+—Cl-F- system, with poor K diabetes. The data ofδD andδ18O components of liquid-phase of fluid inclusion show that the main sources of metallogenic fluid is heated atmospheric precipitation, then formation water, no obvious connection with basaltic magmas hydrothermal fluid. The characters of metallogenic fluid are low rare earth element and rich F-. Metallogenic fluid transform from reducibility to oxidizability in mineralization process. The mix of atmospheric precipitation may another important reason causing this change. Tuff, tuff breccia and so on may the ore source bed of antimony ore field of Qinglong.(3) According to the discussing about the structure-fluid coupling, suggested that the structure of Qinglong antimony ore field is the main actor in coupling in the structure-fluid coupling mineralization. Research results show that antimony Qinglong ore field is volcano-sedimentary-reformed type strata-bound deposit. The metallogenetic model is that transformation fluids including atmospheric precipitation and formation water flows along the structures (fracture,unconformity) into ore source bed then changed into metallogenic fluid, in the end precipitated in the advantageous space. |
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