| The Kangdian metallogenic belt is one of the important lead-zinc mineralization areas in China,and the Zhaiziping Pb-Zn deposit is located in the north end of the Kangdian metallogenic belt and the Jintang curved structure belt.This paper is based on the previous work,through a large number of field geological survey,combined with representative rock pieces/ rock slices identification and regular trace elements,inclusions and S-Pb isotope analysis,the comprehensive study.The main research results are as follows:(1)Through the system to collect the basic geological data of the predecessors,combined with the geological investigation of the field route,the formation,magmatic rock and tectonic characteristics of the Zhaziping Pb-Zn mining area are further clarified.(2)Orebody characteristics have been Identified.The orebody is layered and has a good contact with the surrounding rock.The ore body has a small change in production status,consistent with the formation of the formation,no branching phenomenon,no structural damage,ore body shape rules.(3)Ore characteristics have been Identified.The mineral assemblages of Zhaiziping Pb-Zn deposit are simple,the ore minerals are mainly pyrite,sphalerite and galena.The gangue minerals are mainly dolomite,followed by calcite and quartz.The structure is composed of granular(crystal)Structure and metasomatism structure;structure to strip,disseminated structure based.(4)The results show that the ore-forming metal elements of Zhiziping Pb-Zn deposit are not from the surrounding rock.The ore-forming age of the deposit is between 304 Ma and 411 Ma,as the same as devonian age:417Ma ~ 354 Ma.It is shown that the mineralization age of the ore is basically the same as that of the surrounding rock,which is consistent with the sedimentary mineralization.The results of sulfur isotope analysis show that the ore-forming sulfur element may be derived from the seawater sulfate and the superposition of the mineralization.(5)The analysis of fluid inclusions shows that the ore-forming temperature of Zhiziping Pb-Zn deposit is between 121? and 218?,with an average value of 171.2?,which belongs to the typical low-temperature hydrothermal deposit.The salinity of ore-forming fluid is between 9.62 and 21.66wt% NaCl,The average value of 13.96wt% NaCl,ore-forming fluid salinity is mainly in the salinity.(6)The metallogenic stage of Zhiziping lead-zinc mine is divided into three stages: Sedimentary-Exhalative,hydrothermal transformation and epoxidation.The stage of Sedimentary-Exhalative,followed by the formation of dolomite,calcite,sphalerite,pyrite,galena and other minerals;Hydrothermal transformation stage,followed by the formation of sphalerite,galena,sericite and other minerals;epoxidation stage,followed by the formation of white lead,lead alum,limonite,zinc ore and other minerals.(7)By comparing the geological characteristics of the classic MVT and SEDEX Pb-Zn deposits in the world,this paper argues that the Zhaiziping Pb-Zn deposit should belong to the SEDEX deposit and only undergo a certain metamorphism.(8)In this paper,the origin and metallogenic model of Zhiziping Pb-Zn deposit are discussed,which provides a reference for further exploration and prospecting in the surrounding area. |
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