Geochemical Characteristics For The Fracture Tectonic And Prospecting Prediction In The Harvest Metallogenic Region Of Danzhou,Hainan Procince,China

The harvest mining area of tungsten,cesium and rubidium in Danzhou,Hainan Province,China,located in south-west end of the west-east deep fault,and also the north east of the uplift area of the rock mass of the county.It is restricted by NE wrinkle and fracture structure.In the section of the Wen Xipo mine in the harvest mining area,Scheelite is mainly distributed in the crevice of biotite horn rocks in the form of line beads and clusters.By measuring the fissure dip angle of the rich ore,the fissure dip angle is between 45 and 60degrees.The distribution of scheelite along the inter layer and through layers is clear that tungsten deposits were formed after the diagenetic stage.The fissures in the rock mass are mainly composed of tourmaline,micro plagioclase,albite,biotite,apatite and siliceous.It is a silicate mineral in the early stage of ore formation.The stages of oxide and metal sulfide are mainly metallogenic stages,mainly filling scheelite,pyrite and chalcopyrite.Carbonate rocks and chlorite minerals are the main minerals in late mineralization stage.Scheelite,felsic,carbonate and chlorite occur in the crevice of biotite diagenesis.It is understood that tungsten deposits are enriched and mineralizing in late middle stage.The distribution of scheelite is strictly controlled by biotite diorite.In the vicinity of the contact zone,the fracture density and permeability are high.The formation of high fragmentation rock facies and partial ore scheelite reach industrial grade.The biotite types in the harvest mine are mainly 3 types of iron biotite,magnesian biotite and mica.Among them,iron biotite belongs to primary biotite,and most of magnesian biotite and biotite belong to rebalanced primary biotite.The electron microprobe data show that iron rich biotite is rich in Fe and Ti,hydrothermal metasomatism magnesia biotite and mica rich mg rich Si,and is deficient in Ti and Fe.Through petrography,the dark minerals such as plagioclase,tremolite and hornblende in the biotite of the biotite indicate that the magmatic hydrothermal is more influential.The fracture density of the S₁t formation is larger than that of the Indosinian and Yanshan intrusive rocks.This shows that the magmatic hydrothermal solution spread along the hydrothermal fissure and the intrusive tectonic fissures to the S₁t formation,leading to the caesium rubidium ore and gas migration in the upper Silurian tufta group,the middle part of the tungsten cobalt ore,the hydrothermal migration and the mineralization;the lower section is niobium tantalite,the main alteration type of cloud and dolomite alteration.The lithology is natrium granitic,But this article does not focus on the research.The formation temperature of biotite in this area has certain gradient characteristics.According to the biotite thermometer,from the high temperature to the low temperature,the rock mass in Indosinian and Yanshan period is the core of the thermal temperature.In the process of cooling and crystallization,the magmatic hydrothermal fluid moved to the skarn layer through the fault and fissure structure during the cooling and crystallization process.The hydrothermal metasomatism between the skarn and the skarn formed the present cesium rubidium layer.From rock mass to skarn,oxygen fugacity has a certain increasing trend,and scheelite belongs to hydrothermal genesis.In the long British black cloud parent rock,the scheelite formed in the fissure.Scheelite formed quartz vein type scheelite in the quartz veins at the edge of the rock mass,which is in the form of cluster porphyry and fragmentation.Scheelite was not found in the rock mass,and iron oxide began to occur in a large number of angled black cloud parent rocks.The main minerals are pyrite and pyrrhotite.It is confirmed that the contact zone between rock and rock is the oxidation and reduction interface of scheelite.