摘要
滇东南个旧矿区发育有著名的超大型锡多金属矿床,该矿床的形成与花岗质岩浆活动密切相关。本文利用电子探针分析技术对个旧矿区花岗岩中的黑云母开展研究;研究结果表明,黑云母表现出富铝铁、贫镁钙的特征,其FeO^(T)含量为22.81%~26.17%,含铁指数为0.75~0.81,属于富铁黑云母。黑云母的化学组成特征显示其具有较高的结晶温度(616℃~691℃)、结晶压力(318~403 MPa)和结晶深度(12.03~15.24 km),以及较低的氧逸度(logf_(O_(2))=-19.74~-17.05)。综合研究表明,个旧矿区花岗岩源区物质复杂,具有多源性;花岗岩中黑云母整体表现出高铁指数和较低氧逸度等特征,是锡成矿的有利条件。
There is a famous super-large tin polymetallic deposit in Gejiu mining area of Southeast Yunnan.The formation of the mineral deposit is closely related to granitic magmatic activities.By means of electron probe test,the biotite compositions in the granite have been studied systematically.The results show that the biotites are rich in aluminum and iron,and are poor in magnesium and calcium.Their FeO^(T)contents are 22.81%~26.17%with iron content index of 0.75~0.81,belonging to iron-rich biotite.The chemical compositions of the biotite show that they are characterized by high crystallization temperature(616℃~691℃),high crystallization pressure(318~403 MPa),high crystallization depth(12.03~15.24 km),and low oxygen fugacity(−19.74~−17.05).The comprehensive study shows that the source materials of the granite are complex and multi-source.They show high iron index and relatively low oxygen fugacity,which are favorable for tin mineralization.
作者
华洁文
周云
刘奕志
李政林
刘昊茹
陈丛敏
焦显杨
Hua Jiewen;Zhou Yun;Liu Yizhi;Li Zhenglin;Liu Haoru;Chen Congmin;Jiao Xianyang(Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,Guilin University of Technology,Guilin,Guangxi 541004;Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi,Guilin University of Technology,Guilin,Guangxi 541004)
出处
《地质科学》
CAS
CSCD
北大核心
2023年第2期580-597,共18页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
广西重点研发计划项目(编号:桂科AB22035045)
广西自然科学基金项目(编号:2020GXNSFGA297003,2022GXNSFAA035620)
广西八桂学者项目
广西隐伏金属矿产勘查重点实验室项目(编号:桂科隐19-185-17-04)资助。
关键词
黑云母
花岗岩
岩石成因
电子探针
个旧矿区
Biotite
Granite
Petrogenesis
Electronic probe
Gejiu mining area
