Study On Mineralization And Prognosis Of Antimony Deposits In Southern Lushi Country,Henan

After the in-depth study of Antimony polymetallic metallogenic belt in southern Lushi County,Henan province,on the basis of its metallogenic geotectonic conditions,stratigraphic lithology and regional tectonic conditions and magmatic rocks output background,through the explanation of typical ore deposit,the stratigraphic of ore deposits,ore bodies,ore and wall rock alteration characteristics have been researched,the metallogenic period and mineral production order have been summarized in this study report.In which the author choose the fracture structures close to antimony mine,to have some work on tectonic petrology and ore deposit geochemistry,set time limit of ore-forming and tectonic metallogenic mechanism,with the mineralogical characteristics research,fluid inclusions and isotopic analysis method,the ore-forming physicochemical conditions and the metallogenic epoch etc.have been researched,In General,the metamorphism,deformation and mineral source are integrated,the ore-forming elements and ore genesis have been analyzed,and regional metallogenic model is established.According to this research,some innovative understandings are obtained as follows:1.Research on mineralization is carried out,the genesis of the deposit is discussed,and a mineralization model in the area is established.Trace element,constant element,and rare earth element characteristic analysis methods is used.It is determined that stratigraphic marble and deep fluid(mantle source)provide mineral sources for antimony mineralization in this area.Carbon,oxygen,sulfur,lead stable isotopes and ore-forming fluid packages body temperature analysis method is carried out and the properties of the ore-forming fluid are low-middle temperature and low in salinity with Ca2+-Mg2+-Na+-K+-SO42-system containing H2 O and CO2.The uniform temperature of the fluid inclusions is 110?~230?.The mineralization is mostly low-temperature hydrothermal,and its mineralized quartz veins can reach the characteristics of mid-temperature hydrothermal,and between which the calcite veins are formed.The genetic type of antimony ore in this area is metamorphic-magma remodeling antimony deposits.The antimony ore-forming fluids originated from metamorphic hydrothermal fluids and deep magmatic hydrothermal fluids.Combined with comprehensive analysis of ore-controlling geological conditions,an antimony mineralization model was established in this area.2.The type characteristics and mineral combinations of antimony minerals in this area were studied.It is concluded that there are three crystal forms of antimony ore in this area: the early antimonite ore has smaller crystal grains,and most of them occurs as xenomorphic granular;the second phase antimonite ore is the best-developed,coarser,plate-shaped,plate-column-shaped,with cylindrical surface horizontal stripes;terminal antimonite is fine needle-shaped.The chemical composition of antimony ore was determined using an electronic probe.The antimonite ore composition in this area is quite pure and basically free of impurities.Only a few samples contain trace iron,and the impurity elements are often related to the surrounding mineral components.3.The Rb-Sr isotopic age of quartz vein fluid inclusions in antimony ore is 130 ± 2Ma.The main time of the antimony mineralization in the area should be Early Cretaceous.4.The research on the metallogenic characteristics and regional metallurgy of known antimony ore origins and mineralization points was carried out.The metallogenic characteristics of known antimony mineralization were comprehensively summarized,the regional metallogenic factors were summarized,and the antimony ore distribution law was discussed.5.Based on the current various basic survey data,a comprehensive information forecast application study was conducted,a comprehensive information forecast model was established,and the minimum forecast area of antimony ore was delineated and optimized systematically.The research of regional geophysical,geochemical,remote sensing and natural heavy sand prediction information has been carried out systematically.Gravity and geochemical prediction elements with clear geological significance have been extracted through fractal and principal component analysis methods.A comprehensive information prediction model conforming to the metallogenic model was established.The fuzzy prediction weight method was used to delineate and optimize the minimum antimony ore prediction areas.A total of 5 minimum antimony ore prediction areas were delimited,of which 4 were Type B and 1 were Type C,with the total area of 13.67 km2.