Mineralography Characteristics And Genetic Significance Of Shuiyindong Gold Deposit In Zhenfeng Of Guizhou Province

The Shuiyindong gold deposit across two primary tectonic units: the Yangtze block and Southern China fold system of Youjiang orogenic belt(Youjiang basin).The area is located in the North East to Shizong-Maitreya deep fault and NW Nandan Kunlunguan deep fault and EW Gejiu-Binyang deep fracture zone of the triangle "the clamping blocks East-West huijiabao anticline is located in the middle of Yunnan Guizhou Guangxi" Golden Triangle "north.The development of sedimentary strata in southwestern Guizhou,from Devonian to Triassic deposited.The folds and faults in the area are quite developed,forming the basic tectonic framework of the area.The Shuiyindong gold deposit is located in the southwestern Guizhou area in the eastern part of huijiabao anticline,closely related folds and faulting deposit formation and tectonic activity.The structure of the mine area is mainly anticline structure,Near East and West,and the short axis anticline is the core of the mine.The gold deposit in the cave is controlled directly by the anticline.In the area exposed strata are complex,large area distribution under three Triassic Yelang group and Yongning Town formation,two Permian Longtan Formation,Changxin group and Dalong group just sporadically and anticline core.In the mining area structure is developed,there is something near the huijiabao to fold tectonic faults,mainly developed from east to west and from south to North and North East to the three groups,but also between Maokou Formation and Longtan Formation level slip plane.The main host Shuiyindong gold deposit exist Longtan group in paragraph two to a lower top,while tectonic unconformity exists in part of the orebody,Shuiyindong gold deposit is a composite of concealed ore deposits: stratabound type,fracture type auxiliary.Through the ores and downhole observation of the Shuiyingdong gold deposit,the main types of surrounding rock alteration are silicified,dolomitized and pyrite mineralized,and the relationship between "three" and gold is very close,Occurrence of the site is often the output of gold.At the same time there are secondary alteration: arsenopyritization,stibnite mineralization,realgar and orpiment and so on.The Shuiyindong gold ore mineragraphy characteristics research conclusion: Shuiyindong gold deposit,ore minerals are mainly pyrite,arsenopyrite,stibnite and spotty,cinnabar,realgar and orpiment.Gangue minerals are mainly quartz,dolomite,calcite,fluorite,also can see a small amount of illite,sericite,glauconite,organic carbon;ore structures are mainly: disseminated structure,laminated structure,veins(veins)structure,MIAROLITIC structure,biological relics structure,brecciated structure;ore structure mainly has: under the action of crystallization automorphic granular texture-semidiomorphic granular texture-allotriomorphic granular texture,polysynthetic twin structure,contains the crystal structure;strawberry structure under sedimentation;zonal structure,metasomatic relict texture,gel structure,pseudomorph by replacement,skeletal texture under the metasomatism;structure should be crushed under the action of stress.According to the study and analysis of the metallogenic effect of the Shuiyingdong gold deposit,three main metallogenic periods can be divided into three periods: sedimentary diagenesis,hydrothermal mineralization and epiphytic.The hydrothermal mineralization period is further divided into three stages: the quartz-dolomite-pyrite stage,the natural gold-pyrite-arsenopyrite-quartz stage,realgar-cinnabar-quartz-calcite stage.In this paper,In the middle and later of the Permian,the sedimentary facies of the marginal basin of the basin have been prepared for the lithology of the Shuiyindong gold deposit,namely the ore-bearing layer(bioclastic limestone or siltstone)and favorable seal rock(clay rock).The deep ore-forming material has a good migration channel and a stable source,because the early Indosinian-Yanshan early tectonic movement caused by the period of tectonic movement is often accompanied by magma activity and deep rupture.The hydrothermal and thermodynamic conditions of the hydrothermal hydrothermal system are provided by the highly anomalous paleo geothermal.By analyzing the composition of lead isotopes in pyrite,it is inferred that the source of ore-forming material may be mainly composed of orogenic belts dominated by mantle,and the material in the upper crust.The middle and low temperature hydrothermal fluids are the main characteristics of ore-forming fluids.The analysis of hydrogen and oxygen isotopes in inclusions shows that underground hot water from atmospheric precipitation may be the main source of fluid.Light rare earth elements appear in the hydrothermal mass,but with the positive Eu anomaly is due to the deep role and the rock is rich in feldspar.In order to make the ore-forming material reach the favorable location of the ore enrichment,a stratified ore body,a faulted ore body or a structure controlled ore body are formed,Favorable rock formation,while the ore and ore structure is provided by secondary faults and folds.In summary,through in-depth study of the Carlin type gold ore mineral composition,ore fabric,combined with the host rock,orebody and wall rock alteration characteristics,This paper argues that the Shuiyindong gold deposit is Carlin type gold deposit.