| Guizhou Qinglong Dachang Antimony Mine is located in Dachang Town,Qinglong,at the junction of Yunnan,Guizhou,and Guangxi provinces.It is located on the contact zone between the Yangtze Land Block and the Youjiang Orogenic Belt,which is mainly controlled by northeast-southwest tectonic structures.In recent years,the predecessors have continuously carried out geological exploration work in the study area.There have been more in-depth studies on the geological characteristics of the deposit,ore-controlling conditions,wall rock alteration,deposit geochemistry,etc.There is still some controversy regarding the source of the fluid.Through extensive collection of data on Dachang antimony mine in Qinglong County,Guizhou Province,master the macrogeological characteristics of the ore body,ore body size,and scale of Dachang antimony mine;conduct in-depth and detailed oreological research on antimony ore and observe Dachang The micro-geological characteristics of the rocks and ores of antimony ores,master the types of ores and surrounding rocks,the mineral composition of ores(gangue minerals,ore minerals),determine the relationship between ore minerals,ore structure and structure,determine the formation of minerals The sequence is divided into ore-forming stage and ore-forming period;systematically conduct research on fluid inclusions in the transparent minerals of the ore,and use the hot and cold stage to conduct temperature measurement experiments of fluid inclusions on the inclusions,including microscopic petrographic observation and research,that is,inclusion size,distribution characteristics,inclusion type,inclusion uniformity test,to determine its uniform temperature,freezing temperature,and then calculate other inclusions parameters to help determine ore-bearing hydrothermal type,ore-forming temperature,pressure,and formation Depth of ore,etc.;conduct stable isotope testing of ores,analyze the source of ore-forming materials and ore-forming times,comprehensively analyze the geotectonic environment during the ore-forming period,types of ore-forming fluids and fluid migration mechanisms,mineral accumulation spaces,and crystallization ofuseful minerals Mechanism to provide supporting data for the establishment of the Dachang antimony metallogenic model.(1)The ore body appears to be layered or lens-like,which is basically consistent with the stratum.The main structures of antimony ore include massive structures,vein-like and network vein-like structures,breccia-like structures,crystal cave-like structures,soil-like structures,colloidal structures,and disseminated structures;Automorphic grain structure,semi-automorphic-other-shaped grain structure,other-shaped structure,crumpled structure,etc.The ore composition of the mining area is simple.The metal minerals are mainly antimony ore,followed by pyrite,valentinite,yellow antimonite,chalcopyrite,etc.: there are many types of gangue minerals,mainly quartz,fluorite and kaolin,followed by It is barite,gypsum,precious jade(green quartz),calcite,andrhizome,cinnabar,clay minerals,etc.(2)Through analysis and test data of fluid inclusions,ore-forming fluids are mainly derived from atmospheric precipitation,heated by magmatic activities and tectonic movements,and evolved into ore-bearing hydrothermal fluids.The temperature and salinity decrease and crystallize and precipitate mineralization.(3)Isotope test results,the ore-forming materials mainly come from deep parts,and crustal elements are mixed in during the ascent.The ore-forming age was determined to be approximately 125.2-148 Ma.The Qinglong Dachang antimony deposit was formed in Yanshan period.(4)The paper believes that the Dachang antimony ore field is controlled by factors such as horizon,structure,lithology,and ancient karst landforms.According to the results obtained from the above research,the paper believes that Dachang antimony deposit belongs to the supershallow-supergene low temperature hydrothermal deposit. |
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