粤北石人嶂石英脉型钨矿床流体包裹体研究—以14~#脉为例.docx

粤北石人嶂石英脉型钨矿床流体包裹体研究—以14~#脉为例
摘要
粤北石人嶂钨矿区是世界上最大的石英脉型钨矿床之一，具有良好的工业价值和开发价值。本研究以该地区的14~#石英脉为对象，采用显微镜和流体包裹体技术研究了石英脉的特征、成因和流体演化历史。
研究表明，14~#脉主要由石英、方解石、黑钨矿和坦桑石等矿物组成，其中黑钨矿是主要矿物。流体包裹体分析结果显示，石英脉形成时的温度为440~470℃，压力为110~130MPa，流体为NaCl-H2O体系，富含钨、铅、锡、银等元素。
结合地质背景和矿物成因特征，认为石人嶂钨矿区的钨矿床形成于中生代岩浆作用后，通过流体热液循环和交代作用形成了石英脉型钨矿床。钨、铅、锡等元素主要来自于石英脉体内的流体，成矿作用与地壳构造和火山活动密切相关。
本研究揭示了石人嶂钨矿区14~#石英脉的成因和流体演化历史，对该区域的钨矿床的形成机制和矿床开发具有重要指导意义。
关键词：粤北石人嶂；钨矿床；石英脉型；流体包裹体；成因
Abstract
TheShirenzhongtungstendepositinthenorthernGuangdongprovinceisoneofthelargestquartz-veintypetungstendepositsintheworld,withsignificantindustrialanddevelopmentvalue.Inthisstudy,wefocusedonthe14#quartzveininthisarea,andusedmicroscopicandfluidinclusiontechniquestoinvestigatethecharacteristics,genesis,andfluidevolutionhistoryofthequartzvein.
Theresultsshowedthatthe14#veinismainlycomposedofmineralssuchasquartz,calcite,scheeliteandtantalite,withscheelitebeingthemainmineral.Thefluidinclusionanalysisindicatedthatthetemperatureoftheveinformationwas440-470℃,thepressurewas110-130MPa,andthefluidwasaNaCl-H2Osystem,richintungsten,lead,tin,silverandotherelements.
Combiningthegeologicalbackgroundandmineralgenesischaracteristics,itisbelievedthatthetungstendepositinShirenzhongwasformedafterthemagmaticactivityintheMesozoicera,throughfluidhydrothermalcirculationandmetasomatism,formingaquartzvein-typetungstendeposit.Themineralizingelementssuchastungsten,lead,andtinmainlycamefromthefluidinsidethequartzvein,andthemineralizationprocesswascloselyrelatedtocrustalstructuresandvolcanicactivities.
Thisstudyrevealsthegenesisandfluidevolutionhistoryofthe14#quartzveininShirenzhongtungstendeposit,providingimportantguidancefortheformationmechanismanddevelopmentoftungstendepositsinthisarea.
Keywords:ShirenzhonginnorthernGuangdongprovince;tungstendeposit;quartzveintype;fluidinclusions;genesis.