云南省腾冲市象鼻岭锡矿次精矿中铌钽铁矿的富集与找矿意义  

The enrichment of columbite in the secondary tin concentrate of the Xiangbiling Sn deposit,Tengchong City,Yunnan Province,China and its significance for mineral exploration

作　　者：程家龙[1] 崔子良[1,2] 肖常先 卢家旭 CHENG Jia-long;CUI Zi-liang;XIAO Chang-xian;LU Jia-xu(Yunnan Institute of Geology&Mineral Resources Exploration,Kunming 650051,China;Yunnan Geology and Mineral Group Co.Ltd.,Kunming 650051,China;Tengchong Jinshan Geology and Mineral Technology Service Co.,Ltd.,Tengchong 679100,China)

机构地区：[1]云南省地质矿产勘查院,云南昆明650051 [2]云南地矿集团有限公司,云南昆明650051 [3]腾冲县金山地矿科技有限责任公司,云南腾冲679100

出　　处：《矿物学报》2023年第4期565-572,共8页Acta Mineralogica Sinica

基　　金：第二次青藏高原综合科学考察研究项目(编号:2019QZKK0802)。

摘　　要：象鼻岭锡矿产于冈底斯弧盆系腾冲岩浆弧带之龙川江岩浆弧,已发现的锡矿体呈似层状、脉状产于F2两侧断层破碎带中,矿石类型主要为锡石-云英岩型。矿石显微观察和扫描电镜分析表明:矿床主要矿石矿物有锡石、黑钨矿、铌钽铁矿、黄铁矿、黄铜矿和独居石。铌钽铁矿呈不规则粒状产出,粒径0.02~0.1 mm,半自形-他形粒状结构;电子探针能谱分析显示,其主要成分质量分数为Nb5.82%~43.74%、Ta16.37%~67.71%、O10.92%~30.43%、Fe 1.41%~2.45%、Mn 7.88%~14.87%、Sc 0.16%~2.16%,且在锡次精矿中富集。象鼻岭锡矿床中铌钽铁矿赋存状态的研究和在锡次精矿中的富集,为理解象鼻岭锡矿床成因提供了新的信息,对研究区寻找稀有金属铌和钽等具有指示意义。The Xiangbilin Sn deposit is located in the Longchuanjiang magmatic arc within the Tengchong magmatic arc belt in the Gangdise arc-basn system.The discovered Sn orebodies occurred in stratified and vein-like forms in faults and fracture zones on both sides of the F2,with main ore of the cassiterite-greisen type.The microscopic observation and scanning electron microscopy analysis show that the main ore minerals include cassiterite,wolframite,columbite,pyrite,chalcopyrite,and monazite.Columbite occurred in the form of irregular fine grains,with sizes of 0.02-0.1 mm and semri-euhedral to anhedral granular texture.Electron probe microanalyses show that its main compositional mass fractions include 5.82%-43.74%of Nb,16.37%67.71%of Ta,10.92%-30.43%of 0,1.41%-2.45%of Fe,7.88%-14.87%of Mn,and 0.16%-2.16%of Sc.Columbite is enriched in the tin secondary concentrate.The study on the occurrence state of columbite and its enrichment in the tin secondary concentrate in the Xiangbiling tin deposit has provided new information for understanding genesis of the Xiangbiling tin deposit,and is of guiding significance for prospecting rare metals such as niobium and tantalum in the study area.

关 键 词：象鼻岭锡矿 铌钽铁矿 电镜分析 资源远景 

分 类 号：P579[天文地球—矿物学] P618.44[天文地球—地质学]