摘要
广西融水县南刀坳锡多金属矿位于江南造山带南缘,三防岩体的西南外接触带上,先后发现了多个大中型锡多金属矿床。通过岩石地球化学、矿石元素分析和元素相关性分析等方法,探讨锡矿的成矿物质来源和成矿过程。通过对地球化学特征分析认为,该矿的Sn等成矿物质主要来自三防岩体,Pb和Zn等金属元素可能来自地层萃取。金属元素在岩浆演化过程中从熔浆中分离出来,通过隐伏岩体顶部分馏进入地层,提供了区域锡矿成矿的物质来源。成矿过程基本可以分为4个阶段:第一阶段是高温Sn热液从三防岩体侵位过程中分离、结晶、富集;第二阶段是锡矿的剪切改造;第三阶段是含矿热液携带碎裂锡石就位及锡石重结晶;第四阶段为成矿后热液改造叠加。
Nandaoao Tin Polymetallic Mine in Rongshui County,Guangxi Province is located in the south margin of Jiangnan orogenic belt and the southwest contact zone of Sanfang intrusion.Based on the methods of rock geochemistry,ore element analysis and element correlation analysis,the source of tin ore-forming materials and ore-forming process ared discnssed.It is considered that Sn and other ore-forming materials are mainly from Sanfang rock body,and Pb and Zn and other metal elements may come from strata extraction.In the process of magma evolution,metal elements are separated from the magma and then fractionated into the strata through the top of concealed rock mass,which provides the material source of regional tin mineralization.The mineralization process can be divided into four stages:the first stage is the separation,crystallization and enrichment of high-temperature Sn hydrothermal solution from the Sanfang intrusion;the second stage is the shear transformation of tin ore;the third stage is the placement of mineral-bearing hydrothermal carrying cataclastic cassiterite and recrystallization.The fourth stage is the super-position of post-mineralization hydrothermal transformation.
作者
梁燕兰
戴昱
吴庆杰
LIANG Yanlan;DAI Yu;WU Qingjie(Guangxi Institute of Regional Geological Survey)
出处
《现代矿业》
CAS
2021年第7期26-29,69,共5页
Modern Mining
基金
桂北九万大山地区剪切带与锡矿成矿关系研究项目(编号:桂地矿综[2018]14号)。
关键词
三防岩体
地球化学特征
成矿物质来源
成矿过程
three prevention rock mass
geochemical characteristics
source of metallogenic materials
metallogenic process
