川西甲基卡稀有金属矿田528号脉接触变质带锂等稀有元素分布特征及赋存状态  

Distribution and Occurrence of Li and Other Rare Elements in the Contact Metamorphic Zone of the 528th Lode in the Jiajika Rare Metal Ore Field,West Sichuan

作　　者：唐屹[1] 黎诗宏 潘蒙[1] 付小方[1] 郝雪峰[1] 梁斌[2] TANG Yi;LI Shi-hong;PAN Meng;FU Xiao-fang;HAO Xue-feng;LIANG Bin(Sichuan Institute of Geological Survey,Chengdu610081;School of Environment and Resources,Southwest University of Science and Technology,Mianyang,Sichuan621002)

机构地区：[1]四川省地质调查院,成都610081 [2]西南科技大学环境与资源学院,四川绵阳621000

出　　处：《四川地质学报》2021年第4期586-591,603,共7页Acta Geologica Sichuan

基　　金：国家重点研发计划“锂能源金属矿产基地深部探测技术示范”项目“甲基卡及外围锂能源金属矿产基地深部探测技术示范”课题(2017YFC0602702);中国地质调查局“四川三稀资源综合研究与重点评价”项目(12120112208014);四川科技厅“川西锂矿大型能源基地成矿关键技术研究与示范”重点研发项目(2018SZ0276)联合资助的成果。

摘　　要：甲基卡伟晶岩型稀有金属矿田是我国规模最大的稀有金属矿田,No.528号脉是矿田中最具代表性的铌钽矿脉,围岩接触变质带发育较好。本次研究垂直No.528号脉走向布置了1条穿越两侧变质带及矿体的剖面,采用连续捡块法采集了8件围岩蚀变岩石进行了稀有元素分析,并采用LA-ICP-MS对堇青石、白云母、黑云母等主要接触变质矿物进行了单矿物微区分析。结果表明,接触变质岩中Li、Cs、Rb等稀有金属元素含量较高,Li2O平均值达到了伴生稀有金属综合利用的边界品位,可以进行综合利用。Li等稀有元素主要以类质同象的形成赋存于新生白云母及黑云母之中,是引起接触变质岩石稀有元素富集的主要原因。The Jiajika rare metal ore field is the largest rare metal one in China.The 528th lode is the most representive Nb-Ta lode in the ore field and contact metamorphism is well developed in its wallrock.8 samples of the altered wallrock sampled along a section perpendicular to the strike of the 528th lode are analyzed for rare elements.Micro probe analysis of contact metamorphic minerals such as cordierite,muscovite and biotite is carried out by LA-ICP-MS.The results show that the content of Li,Cs,Rb and other rare metal elements in the contact metamorphic rocks is high,and the average value of Li_(2)O reaches the cut-off grade of comprehensive utilization of associated rare metals.Li and other rare elements mainly occur as isomorphism in muscovite and biotite as neogenic minerals.

关 键 词：接触变质岩 稀有金属矿田 赋存状态 甲基卡 

分 类 号：P588.311[天文地球—岩石学] P577[天文地球—地质学]