广西西大明山罗维钨铋多金属矿床矿化特征及成因  

Mineralization Characteristics and Genesis of the Luowei W-Bi Polymetallic Deposit in Xidamingshan,Guangxi

作　　者：曹杰 李赛赛[1,2] CAO Jie;LI Saisai(College of Earth Sciences,Guilin University of Technology;Guangxi Key Laboratory of Hidden Metallic Ore Deposit Exploration)

机构地区：[1]桂林理工大学地球科学学院,广西壮族自治区桂林市541004 [2]广西隐伏金属矿产勘查重点实验室,广西壮族自治区桂林市541004

出　　处：《现代矿业》2021年第7期14-20,55,共8页Modern Mining

基　　金：广西自然科学基金项目(编号:2016GXNSFBA380067,2015GXNSFDA139029);2017年广西地质矿产勘查项目(编号:桂国土资办[2016]466号);桂林理工大学人才引进科研启动基金项目(编号:002401003374)。

摘　　要：罗维钨铋多金属矿床是广西西大明山地区新发现的代表性中型热液矿床。为了促进西大明山地区找矿勘查工作,从地表、深部和显微镜下3个角度观察分析了该矿床的矿化特征,并探讨了矿床成因。罗维钨铋多金属矿床为层控矽卡岩型矿床,矿体主要受寒武纪小内冲组砂岩层理控制,地表氧化后呈黑褐色。矿石矿物主要沿砂岩层理分布,多充填于重结晶的石英间隙,少量被石英包裹。白钨矿与磁黄铁矿密切共生。含矿热液在富集成矿的同时,还沿矿体围岩中的节理形成网格状矿化蚀变。结合同位素组成和成矿时代等资料分析,认为该矿床与燕山晚期形成的隐伏花岗闪长岩体具有直接的成因联系,岩体提供了主要的成矿流体。Luowei W-Bi Polymetallic Deposit is a representative medium-sized hydrothermal deposit newly discovered in Xidamingshan area,Guangxi.In order to promote the prospecting work in Xidamingshan area,the mineralization characteristics of the deposit are observed and analyzed from the perspectives of surface,depth and microscope,and the genesis of the deposit is discussed.Luowei W-Bi polymetallic deposit is a stratabound skarn deposit.The ore bodies are predominantly layered,distributed along bedding in sandstone of the Cambrian Xiaoneichong Formation,and are black-brown owing to oxidation at the surface.Ore minerals are mainly distributed along the bedding of sandstone,mostly filled between the recrystallized quartzs,and a few are wrapped in quartz.There is a close paragenetic relationship between scheelite and pyrrhotite.At the same time as mineralization,the ore-bearing hydrothermal fluid forms a grid-like alteration along the joints in the surrounding rock of the ore body.Combined with the analysis of isotopic composition and metallogenic age,it is considered that Luowei W-Bi polymetallic deposit has a direct genetic relationship with the hidden granodiorite formed in the late Yanshanian,and the hidden granodiorite provides the main ore-forming fluid.

关 键 词：矽卡岩型矿床 层控 燕山晚期 多金属矿床 

分 类 号：P618.2[天文地球—矿床学]