冀东中部稀有金属花岗伟晶岩的发现及意义  

Discovery and significance of rare metal granitic pegmatite in central eastern Hebei

作　　者：李鹏 冯钊 孙耀锋 张璞 唐宗源 LI Peng;FENG Zhao;SUN Yaofeng;ZHANG Pu;TANG Zongyuan(Environmental Geological Survey Institute of Hebei Coalfield Geology Bureau,Shijiazhuang 050085,Hebei,China;Institute of Resources and Environmental Engineering,Hebei GEO University,Shijiazhuang 050031,Hebei,China;Geological Survey Institute,Hebei GEO University,Shijiazhuang 050031,Hebei,China)

机构地区：[1]河北省煤田地质局环境地质调查院,河北石家庄050085 [2]河北地质大学资源与环境工程研究所,河北石家庄050031 [3]河北地质大学地质调查研究院,河北石家庄050031

出　　处：《矿产勘查》2024年第4期540-549,共10页Mineral Exploration

基　　金：河北省青年科学基金项目(D2022403027)资助。

摘　　要：冀东地区位于华北克拉通北缘东段马兰峪复式背斜,是中国北方重要的内生金属成矿区。最近,在冀东中部新发现了一系列LCT型和NYF型稀有金属花岗伟晶岩,同空间伴生绢英岩化蚀变岩和稀有金属石英脉,成矿元素包括Ag、Au、Rb、Li、Nb、Zr、HREE、Th等。LCT型花岗伟晶岩包括锂云母/白云母花岗伟晶岩和天河石花岗伟晶岩,Rb_(2)O含量最高可达0.43%,最低为0.06%;Li_(2)O分布不均,仅在锂云母花岗伟晶岩中富集,最高可达0.33%。NYF型电气石花岗伟晶岩主要富集Nb,局部富集电气石,Nb含量为0.05%~0.06%,Ta含量很低,ThO_(2)含量为0.02%~0.05%。同空间的绢英岩化蚀变岩Rb_(2)O含量为0.06%~0.15%,Li_(2)O含量为0.07%~0.22%,局部含金,最高品位可达1.57×10^(-6);稀有金属石英脉,Nb_(2)O_(5)含量为0.06%~0.50%,富集Zr、重稀土、Th、U、Ag,其中Ag品位为18.2×10^(-6)~160.0×10^(-6)。初步地球化学分析认为,岩浆的成分变化以及岩浆-流体作用可能是研究区稀有金属花岗伟晶岩成矿的关键。The eastern Hebei area is located in the Malanyu anticlinorium in the eastern part of northern margin of the North China Craton,which is an important endogenetic metallogenetic area in northern China.Recently,a series of LCT-type and NYF-type rare metal granitic pegmatite have been found in the central part of eastern Hebei,and sericitization altered rocks and rare metal quartz veins are associated in the same space.Metal⁃logenic elements include Ag,Au,Rb,Li,Nb,Zr,HREE,Th,etc.LCT-type granite pegmatite includes lithium mica/muscovite granite pegmatite and amazonite granite pegmatite,with Rb_(2)O content up to 0.43%;Li_(2)O is unevenly distributed and enriched only in the lepidolite granite Pegmatite,up to 0.33%.NYF-type tourmaline granite pegmatite is mainly enriched with Nb,and locally enriched with tourmaline.The Nb content is 0.05%-0.06%,the Ta content is very low,and the ThO_(2)content is 0.02%-0.05%.The Rb2O content of sericitization altered rocks in the same space is 0.06%-0.15%,and the Li_(2)O content is 0.07%-0.22%.They contain gold locally,and the highest grade can reach 1.57×10^(-6).In rare metal quartz veins,the Nb_(2)O_(5)content is 0.06%-0.50%,enriched in Zr,HREE,Th,U,Ag,with an Ag grade of 18.2×10^(-6)-160.0×10^(-6).Preliminary geochemi⁃cal analysis shows that the composition change of magma and magma-fluid interaction may be the key to the mineralization of rare metal granitic pegmatite in the study area.

关 键 词：稀有金属 花岗伟晶岩 蚀变岩 石英脉 冀东中部 

分 类 号：P611.12[天文地球—矿床学]