| The Beiya gold poly-metallic deposit in Northwestern Yunnan is located in the Yangtze River-the Ailaoshan-Red River alkali-rich porphyry zone in the middle section of the Lijiang-Dali porphyry gold polymetallic mineralization concentration area,is a typical representative of the southwestern Sanjiang poly-metallic mineralization zone in Cenozoic porphyry deposit.Based on previous research results,through the development of Beiya gold deposit tectonic alteration mapping and tectonic alteration section measurement,collecting representative samples of rock and ore,rock mineral identification and analysis of major and trace chemical test,and combined with the electron probe in the studies the types and characteristics of mineralization alteration of petrology,mineralogy,summarize the alkali rich porphyry,analysis of typical tectonic alteration facies profile alteration and mineralization zoning characteristics,summarizes the mineralization alteration zoning laws,establishing mineralization alteration zoning mode,put forward the prospecting area.In this paper,the main achievements of understanding:(1)The Beiya Mining area existing rock alteration,contact zone alteration and the alteration of surrounding rock of three types of alteration.The alkali rich porphyry in the alteration zones from the center outward mainly has:the potassic zone,sericitization zone,argillic zone,propylitization zone.Contact with a calcareous skarn,are developed in flash Petrochemical diopside skarn,apatite containing calcium aluminum garnet skam Touhui lime quality.Limestone rock alteration zoning by the outer side:Dali alteration zones,silicified zone,calcitization belt.Potassium type to potash feldspathization,biotitization primarily with corrosion,alteration of potassium feldspar is band edge,cloudy,vein,biotite is fine fibrous,vein replacement replacement and phenocryst porphyry matrix.Sericitization zone type to sericitization,silicification zone of inhibition,sericite was mainly micro scaly along plagioclase phenocrysts cleavage,edge metasomatism,quartz is interspersed with porphyry vein.Mud type to Kln main belt corrosion,metal mineralization weak.Propylitizaion zone alteration type by chloritization.(2)The mineralization zoning as follows:[Porphyry body]deposits and porphyry(body)related copper(molybdenum),gold mineralization,such as natural gold,chalcopyrite,bornite,molybdenite,pyrite,arsenopyrite?[Contact zone]contact zone and skarn type deposit(body)of gold,iron,copper mineralization related to the main the natural gold,such as magnetite,siderite,pyrite,chalcopyrite,bornite?[Limestone]hydrothermal vein type deposit(body)mineral gold,iron,lead and zinc,silver related mainly,such as natural gold,silver,natural magnetite,pyrite,galena,sphalerite.(3)The Beiya deposit is closely related to the mineralization and alteration.The Rock layer of hydrothermal vein-type gold deposit in magnetite mineralization,limonitization,silicified fracture zone,between faults and fractures in surrounding rock and rock mass;near the contact skarn type gold deposit located in the skarn mineralization,magnet,lim;porphyry gold deposit is mainly produced in rock mass the Si-Ser-Py and Kln band.(4)The zoning laws of mineralization and alteration have been summarized,the zoning model of mineralization and alteration is established,and the prospecting prediction is implemented. |
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