河南省董家埝银矿稀土元素地球化学特征及地质意义  

REE Geochemical Characteristics and Geological Significance of Dongjianian Silver Deposit,Henan Province

作　　者：白德胜[1] 纵瑞[1] 张凯涛 董旭舟 杨睿娜 Bai Desheng;Zong Rui;Zhang Kaitao;Dong Xuzhou;Yang Ruina(No.2 Institute of Geological&Mineral Resources Survey of Henan,Zhengzhou 450001,China)

机构地区：[1]河南省地质矿产勘查开发局第二地质矿产调查院,河南郑州450001

出　　处：《中国稀土学报》2021年第5期816-826,共11页Journal of the Chinese Society of Rare Earths

基　　金：河南省财政地质勘查续作项目(豫国土资发[2018]22号);河南省地质矿产勘查开发局第二地质矿产调查院科技创新基金项目(豫地二矿科[2018]-02号)资助。

摘　　要：为研究董家埝银矿稀土元素组成特征及其地质意义,对矿区岩浆岩、地层、构造角砾岩、蚀变岩及银矿石等的稀土元素进行了ICP-MS分析测试。从沉积岩系→片麻岩→构造角砾岩→小河花岗岩→银矿石→蚀变花岗质碎裂岩→闪长岩、辉绿岩,ΣREE逐渐增加,显示了成矿流体对岩浆岩、地层的淋滤改造作用。各类岩矿石的Y/Ho比值均与球粒陨石接近,且在La/Ho-Y/Ho图解上呈近水平分布,表明它们之间具有同源性,存在一定的成因联系。银矿石的稀土元素可分为两组:一组表现为Eu正异常和Ce负异常,反映了原始成矿热液稀土元素特征,指示成矿流体有具相对高温和相对还原的流体特征,且在成矿过程中可能有海水参与;另一组银矿石表现出Eu负异常和Ce负异常,为岩浆热液叠加改造的反映。综合分析认为,董家埝银矿属于中高温裂隙填充型矿床。In order to study the REE composition characteristics and geological significance of Dongjianian silver deposit,the rare earth elements of magmatic rocks,strata,tectonic breccia,altered rocks and silver ore were analyzed by ICP-MS.From sedimentary rock series→gneiss→tectonicbreccia→Xiaohegranite→silverore→altered granitic cataclasticrock→diorite and diabase,the ΣREE increases gradually,which indicates that the ore-forming hydrothermal solution has leached and reformed the magmatic rock mass and stratum.The Y/Ho ratios of all kinds of rocks and ores are close to that of chondrite,and they are nearly horizontally distributed on the La/HoY/Ho diagram,indicating that they have homology and certain genetic connection.The REE of silver ores can be divided into two groups:one group shows positive Eu anomaly and negative Ce anomaly,which reflects the REE characteristics of the original ore-forming hydrothermal fluid,indicating that the ore-forming fluid has the characteristics of relatively high temperature and relative reduction,and seawater may participates in the mineralization process,the other group shows both negative Eu and Ce anomaly,reflecting the superimposition and transformation of magmatic hydrothermal solution.Comprehensive analysis shows that Dongjianian silver deposit belongs to medium high temperature fracture filling type deposit.

关 键 词：稀土元素 地球化学特征 地质意义 董家埝 河南 

分 类 号：P618.52[天文地球—矿床学] P595[天文地球—地质学]