云南大红山铜铁矿床稀土矿物特征及其地质意义  

Characteristics of REE minerals in the Dahongshan copper-iron deposit,Yunnan and their geological significances

作　　者：罗洪 任涛[1] 管申进 蒙六清 杨天赐 LUO Hong;REN Tao;GUAN Shenjin;MENG Liuqing;YANG Tianci(Faculty of Land and Resources Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Yuxi Mining Co.,Ltd.,Yuxi Yunnan 653100,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]玉溪矿业有限公司,云南玉溪653100

出　　处：《矿物学报》2025年第1期160-168,共9页Acta Mineralogica Sinica

基　　金：云南省重大科技专项计划项目(编号:202202AG050014)。

摘　　要：大红山矿床是滇中地区最具代表性的铜铁矿床,地处康滇地轴南端西缘。矿区出露前寒武系变质基底,并经历了强烈的变形和变质改造作用,铜铁矿体呈似层状分布于曼岗河组和红山组的变质火山沉积地层。为了探索大红山铜铁矿床的稀土矿物特征及富集规律,本研究通过扫描电镜能谱测试在矿石中发现大量与铜铁矿物共生的氟碳钙铈矿、磷钇矿、磷铈镧矿、铱钇氧化物等稀土矿物,这些稀土矿物均分布于变钠质凝灰岩为围岩的矿体中,稀土矿物含量随铜品位升高而升高。在条纹条带状矿石中观察到大量轻稀土矿物和少量重稀土矿物,轻稀土矿物均以富集La、Ce、Nd为主,无放射性元素U和Th;重稀土矿物以Y为主要元素,含少量Dy。矿床中稀土元素主要以独立矿物和类质同象两种存在形式;大量独立稀土矿物和富稀土矿物(磷灰石、褐帘石)的发现说明该矿床是一个富稀土元素的多金属矿床。The Dahongshan deposit is the most representative copper-iron deposit in the central Yunnan.It is located in the western edge of the southern end of the Kangdian area.The Precambrian metamorphic basement,which had undergone strong deformation and metamorphism,are outcropped in the deposit.Layered copper-iron ore bodies mainly occurred in the metamorphosed volcanic sedimentary strata of the Manganghe and Hongshan formations.In order to explore the characteristics and enrichment regularity of rare earth minerals in the Dahongshan deposit,by using scanning electron microscope energy spectrum analysis,REE minerals including bastnasite,xenotime,monazite and iridium yttrium oxide are widely intergrown with Cu-Fe minerals in the ore.These REE minerals are all hosted in the ore bodies with wallrock of meta-sodium tuff.Contents of those REE minerals are increased with the increase of copper grades of ores.Abundant LREE minerals and minor HREE minerals are observed in the laminated and banded ore.The LREE minerals are mainly enriched in La,Ce and Nd,without radioactive elements U and Th.The HREE minerals are mainly composed of major Y and minor Dy.Combined with previous results,rare earth elements in the deposit occurred mainly in forms of REE independent minerals and isomorphism in the lattice of REE-bearing minerals.The discovery of a large number of independent REE minerals and REE-rich minerals(apatite,allanite)shows that the Dahongshan deposit is a Cu-Fe polymetallic deposit enriched in rare earth elements.

关 键 词：大红山 铜铁矿床 稀土矿物 富集规律 滇中 

分 类 号：P618[天文地球—矿床学]