河南省卢氏县叶家沟-桃花坪一带稀有金属矿床地质特征及找矿方向  

Geological characteristics and prospecting direction of the rare metal deposits in Yejiagou-Taohuaping,Lushi County,Henan Province

作　　者：黄传计 陈少伟 李艳艳 许波 崔晓峰 HUANG Chuanji;CHEN Shaowei;LI Yanyan;XU Bo;CUI Xiaofeng(Henan No.5 Geological Brigade Co.,Ltd.,Zhengzhou 450016,Henan,China;Henan Natural Resources Science and Technology Innovation Center(High-Value Comprehensive Evaluation and Utilization of new mineral materials),Zhengzhou 450016,Henan,China;Henan Xinya Geological Mineral Co.,Ltd.,Zhengzhou 450016,Henan,China)

机构地区：[1]河南省第五地质大队有限公司,河南郑州450016 [2]河南省自然资源科技创新中心(矿物新材料高值综合评价与利用研究),河南郑州450016 [3]河南鑫亚地质矿产有限公司,河南郑州450016

出　　处：《矿产勘查》2023年第5期757-765,共9页Mineral Exploration

基　　金：河南省2021年度自然资源科技项目“东秦岭河南段高纯石英原料评价方法研究”(豫自然资函[2021]157号);河南省2011年度地质勘查基金项目(豫国土资发[2013]7号)联合资助。

摘　　要：卢氏县叶家沟—桃花坪稀有金属矿床位于东秦岭伟晶岩分布区的龙泉坪密集区,处在卢氏县西南部豫陕交界处的灰池子岩体南部。区内伟晶岩脉发育,自灰池子岩体向南,伟晶岩类型以黑云母型→二云母型→白云母型过渡,其中白云母型伟晶岩自北向南又以白云母伟晶岩→含电气石白云母型伟晶岩→电气石强钠长石化绿柱石伟晶岩→电气石强钠长石化锂辉石伟晶岩过渡,自北向南交代作用逐渐加强,稀有金属含量逐渐增多。矿石类型依矿物组合可分为微斜长石-钠长石花岗伟晶岩型铷矿石,钠长石花岗伟晶岩型铌、钽、铷矿石,锂辉石-钠长石花岗伟晶岩型锂、铌、钽、铷矿石。矿体的产出受张性构造和伟晶岩交代作用双重控制,褶皱发育的伟晶岩密集区更有利于稀有金属成矿,离灰池子岩体较远的秦岭岩群大理岩中的张性构造裂隙是寻找稀有矿产的有利地段。A rare metal deposit,geographically located in Yechaigou-taohuaping community of Lushi County in Henan province in China,is known as Longquanping hotspot among the numerous ones in a mineralized zone in the eastern Qinling which is rich in pegmatite,to the south of the Huichizi pluton at the Henan-Shaanxi junction.The pegmatite dyke is common in the southern Huichizi pluton,with a dominant component varying from biotite in the north to domicile in the middle,ending up with muscovite in the south.Specifically,the pegmatite rich in muscovite in the region can be identified as albite pegmatite,tourmaline-bearing muscovite pegmatite,tourmaline strongly sodic feldsparized beryl pegmatite,tourmaline strongly sodic feldsparized lithium plagioclase pegmatite with a transitional order from north to south.Additionally,a growing trend has been observed in the extent of metasomatism and the concentration of rare metals.As for the mineral combination,the ore types can be classified into multiple categories,including microplagioclase-sodic feldspar granitic pegmatite rubidium ore,sodic feldspar granitic pegmatite niobium-tantalum-rubidium ore,lithium plagioclase-sodic feldspar granitic pegmatite lithiumniobium-tantalum-rubidium ore.Moreover,the geometries of the pluton could be shaped by both tensional structures and metasomatism of pegmatite,suggesting that zones with intensively distributed pegmatite and existence of plenty of folds are beneficial for rare metal mineralization.The area with structurally extensional fissures in the marble of Qinling rock group far from Huichizi pluton,in turn,is expected to be the most favorable for seeking rare minerals.

关 键 词：伟晶岩 稀有金属 地质特征 找矿方向 卢氏县 

分 类 号：P618.6[天文地球—矿床学]