Study On Characteristics Of Fluid Inclusions And Its Significance Of Qinglong Dachang Antimony Deposit In Guizhou Province

Qinglong Dachang antimony deposit is located in Dachang Town,Qinglong County,Guizhou Province.Guizhou Province is one of the important producer of antimony deposits in China.The tectonic setting of dachang antimony deposit is located in South-East Asia plate,near the two major global tectonic domain of Tethys-Himalayas and the Pacific on the east side of the binding site.Its geotectonic position is very special,which belongs to the category of the continental plate interior.Predecessors have studied Qinglong Dachang antimony deposit's geological characteristics of deposit,occurrence mode of antimony,geochemical characteristics of deposit and ore genesis,accumulated a certain amount of research data.The genetic type of deposit only through the macroscopic geologic features for classification.On the whole,study of the Dachang antimony deposit is relatively weak,especially in terms of ore-forming fluid.Predecessors' research on fluid inclusions are not perfect.Ore-forming fluid characteristics and genesis of ore deposits are closely related.Analysis of geochemical characteristics of ore deposit can be used to obtain the most direct and effective information.Analysis of characteristics of fluid inclusions is the most valuable evidence to genetic type of ore deposit.Study on fluid inclusions is one of the most effective method of study on ore genesis.In this paper,start from the microscopic petrography of dachang antimony deposit's fluid inclusions,focuses on the analysis teat and calculation of fluid inclusions(homogenization temperature,freezing point,salinity,pressure,mineralization depth,fluid inclusion composition and so on),to determine its ore-forming hydrothermal type and to further establish its genetic type of Dachang antimony deposit.Through detailed field geological investigation and detailed classification and analysis of samples of Qinglong Dachang antimony,understand the geological characteristics and occurrence,size and quantity of ore bodies of this deposit.From macroscopic view,the author have had an overall understanding of this deposit.From microcosmic view,the author studied the petrographic thin sections,polished sections and inclusion thin sections.By polarized light microscopy to study microscopic petrography and mineragraphy of thin sections and polished sections.To learn the imformation of mineral paragenesis and mineral build order.Use temperature controlled stages to measure fluid inclusions' temperature.Get the Homogenization temperatures and freezing point of fluid inclusions,then calculate salinity,pressure,mineralization depth and density.Discussed deposit's metallogenic environment,properties,origin of ore-forming fluid and mode of transport and precipitation of minerogenetic.At last,combining with the results of previous studies on stable isotope and vapor and liquid composition of inclusion,establishment metallogenic model of Qinglong Dachang antimony.This paper studies mainly come to the realization and results blow:Fluid inclusions in Qinglong Dachang antimony ore deposit types include: gas liquid two phase fluid inclusions and pure liquid phase fluid inclusions.Most of them are pure liquid phase fluid inclusions,followed by gas liquid two phase fluid inclusions.Gas liquid two phase fluid inclusions' homogenization temperature and freezing point were mainly measured and calculate salinity,density,pressure and mineralization depth.Dachang antimony deposit's metallogenic fluid characteristics are low temperature(132.3~243.0?),low salinity(0.35~15.86wt%),medium density(0.86~0.99g/cm3).Ore-Forming depth is shallow(1.57km).Ore-forming fluid is hot water which is formed of atmospheric precipitation contact rising magma in deep crust.Through the information of fluid inclusions can determine the Qinglong Dachang antimony deposit belongs to epithermal deposit.