摘要
利用包裹体测温和激光拉曼探针测试技术对粤北梅子窝钨矿58#矿脉研究发现:石英包裹体的主要类型为Ⅰ型包裹体(NaCl-H2O体系),主成矿阶段的包裹体成分以H2O为主,含少量N2、 CH4、 CO2气体,均一温度在169.1~358.7℃,盐度(w(NaCleqv)) 0.70%~8.41%,成矿流体密度为0.66~0.94 g/cm3,显示成矿流体属于中高温、低盐度及中低密度热液。研究认为,当成矿流体物理化学性质改变时,流体体系失衡引起钨络合物分解,并重新与Mn2+和Fe2+结合形成新的复合物,最终在有利部位沉淀晶出形成钨矿。根据流体包裹体均一温度在垂向变化出现异常以及温度、盐度及密度出现分段聚集而又相互叠加的现象,提出矿区存在两期成矿流体的叠加作用,在不同岩石接触界面及温度梯度带是重要的找钨地带。
By inclusion temperature measurement and laser Raman probe technology,the study of the Vein 58# of the Meiziwo tungsten deposit in northern Guangdong found that the main types of quartz inclusions are I-type inclusions(NaCl-H2O system),and the inclusions of the main metallogenic stage.The composition is dominated by H2O with a small amount of N2,CH4,and CO2 gases,indicating a rich liquid-phase ore-forming fluid.The homogeneous temperature ranges from 169.1 to 358.7℃ ,a salinity w(NaCleqv)ranges from 0.70% to 8.41%,and an ore-forming fluid density value.The range of 0.66 to 0.94 g/cm3 indicates that the ore-forming fluid is a medium-high temperature,low salinity,and medium-low density hydrothermal fluid.It is considered that when the physical and chemical properties of the ore fluid change,the fluid system imbalance will cause the tungsten complex to decompose and recombine with Mn2+ and Fe2+ to form a new complex,which will eventually precipitate and crystallize in the favorable position to form tungsten ore.In addition,according to the phenomenon that the homogenization temperature of fluid inclusions changes abnormally in the vertical direction,and that the temperature,salinity and density gather in sections and overlap with each other,it is proposed that there are two stages of superimposition of ore-forming fluid in the mining area,and that the most important area to look for tungsten is at different rock contact interfaces and temperature gradient zones.
作者
田晗钰
王潇
韦龙明
孔凡乾
田野
TIAN Han-yu;WANG Xiao;WEI Long-ming;KONG Fan-qian;TIAN Ye(College of Earth Sciences,Guilin University of Technology,Guilin 541006,China;W uhan Xinxin Semiconductor Manufacturing Co.,Ltd.(XMC),Wuhan 430205,China;Regional Geology and Mineral Resource Survey of Jjilin Province,Changchun 130022,China;Langfang Natural Resources Integrated Survey Center,China Geological Survey,Langfang 065000,China)
出处
《桂林理工大学学报》
CAS
北大核心
2020年第1期47-54,共8页
Journal of Guilin University of Technology
基金
全国危机矿山接替资源勘查专项典型矿床研究项目(200644089)
国家深部探测计划专项(SinoProbe-03-01)。
关键词
石英流体包裹体
均一温度
梅子窝钨矿
粤北
quartz fluid inclusions
homogeneous temperature
Meiziwo tungsten deposit
north of Guangdong
