摘要
油麻坡钨钼矿床是桂东南博白-岑溪W-Mo-Pb-Zn-Au-Ag成矿带内新近评价的一个大型矽卡岩型矿床,矿体产于泥盆系下统矽卡岩中。将成矿划分为干矽卡岩阶段(Ⅰ)、湿矽卡岩阶段(Ⅱ)、石英-硫化物阶段(Ⅲ)和碳酸盐-萤石阶段(Ⅳ),其中,Ⅱ和Ⅲ为主成矿阶段。为探究成矿作用中成矿流体特征,采用流体包裹体显微测温对主成矿阶段流体的性质进行了研究。研究表明,Ⅱ阶段即湿矽卡岩阶段流体包裹体均一温度主要集中于280~340℃,盐度主要集中于3.33%~5.94%;Ⅲ阶段即石英-硫化物阶段流体包裹体均一温度主要集中于260~320℃,盐度主要集中于5.05%~9.99%。成矿流体以中高温、低盐度为特征。成矿过程中流体发生过沸腾和混合作用。区内成矿与燕山晚期油麻坡岩体有关,属中高温岩浆热液交代-充填型矿床。
Occurred in the Lower Devonian skarn,the Youmapo tungsten-molybdenum deposit is a large-size recently evaluated skarn type deposit in the Bobai-Cenxi W-Mo-Pb-Sn-Au-Ag metallogenic belt,southeast Guangxi.Four stages of skarn-type ores have been distinguished,i.e.,StageⅠ-dry skarn stage,StageⅡ-wet skarn stage,StageⅢ-quartz and sulfide stage,and StageⅣ-carbonate and fluorite stage.In addition,the StageⅡ and the StageⅢ are main metallogenic stages.In order to explore the characteristics of ore-forming fluid in mineralization,the microthermometry of fluid inclusions has been used to research the nature of the ore-forming fluids in the main ore-forming stage.Results indicate that the homogenization temperatures of the fluid inclusions in stageⅡ andⅢ mainly vary from 280 to 340℃ and from 260 to 320℃,whereas their salinities mainly range from 3.33%to 5.94% and from 5.05%to 9.99%,respectively.The oreforming fluid in this deposit has the characteristics of medium to high homogenization temperatures and low salinity.Boiling and mixing have occurred during the mineralization.The ore deposit is a medium to high magmatic hydrothermal replacement filling type deposit,and the mineralization in the area was related to late Yanshanian Youmapo pluton.
出处
《西北地质》
CAS
CSCD
2017年第2期178-190,共13页
Northwestern Geology
基金
基金项目:广西钨钼典型矿床专题研究
广西壮族自治区钨钼成矿规律研究(桂财建函[2015]118号)
关键词
流体包裹体
矿床成因
油麻坡钨钼矿床
广西博白
fluid inclusions
genesis of ore deposit
Youmapo Tungsten-Molybdenum deposit
Bobai County of Guangxi Zhuang Autonomous Region
