The Preliminary Research Of Metallogenic Regularity On Hei-shanliang W-Mo Deposit,in Subei County,Gansu Province

The study area is located Beishan area in the northwest Gansu Province,and is located in the Tarim plate and Kazakhstan plate combination area of the north of Hong shishan plate suture zone,and the eastern Kazakhstan plate Au,V,P,U,W,Fe-Cu and Pb-Zn-Ag mineralization belt.Through the mineralogenetic epoch,metallogenic material and ore-forming fluid of source and evolution of the Hei-shanliang W-Mo deposit SuBei County,and combined with the feature of regional metallogenic evolution analyses the formation mechanism of the ore deposit.Combination within the rock mass,drilling data,rock mass in the ore and surrounding rock,the detailed field investigation and indoor research test work,summed up the characteristics of the deposit of quartz vein type ore mineralogy and petrology,combined with regional predecessors' research results,focusing on metallogenic regularities of the Hei-shanliang W-Mo desposit are analyzed.Made the following main ideas:1.Through comprehensive mineralization features,metallogenetic temperature,composition of fluid inclusions and O,S isotope characteristics,it is concluded that the genesis of ore deposit types belong to the Medium-High temperature hydrothermal:hydrothermal metasomatic type of Medium-High temperature and hydrothermal quartz vein type of medium-high temperature,and they is controlled by the same fracture structure.2.Fluid inclusion research suggests that the ore-forming fluid of the main metallogenic stage(in the early phase of mineralization)in the Hei-shanliang W-Mo desposit belong to a CO2-H2O-NaCl fluid system,with medium-high temperature(251-300 ?C),medium-low salinity(9.86?14.25 wt%NaCI),Low density(0.852?0.893 g/cm3).The ore fluid inclusions is mainly CO2 and H2O in the gas phase composition,and SO42-,Cl-,Na+ and K+ in the liquid phase composition.By fluid inclusion data,we can get the depth of about 3 km for metallogenic deposit.0,S isotope research shows that the ore-forming fluid is the magma.3.During Variscan stage,Beishan area entered the stage of orogeny of stretching,the ore fluids in the process of the granitic magma rising to the formation of W,Mo and other elements of the extraction,provides a plenty of Hei-shanliang W-Mo deposit.The ore fluid through the reduced fluid pressure boiling lead to the sulfide precipitation(including scheelite)with the Hei-shanliang W-Mo desposit,at the same time,the fluid mixing action may accelerate the massive sulfide deposits(including scheelite),and finally formed the Hei-shanliang W-Mo desposit in the late of Variscan stage.