滇西高黎贡山地区培里伟晶岩型锂矿化的发现及其意义  

Discovery of the Peili pegmatitic lithium deposit in Gaoligong area,western Yunnan Province and its implication

作　　者：闫庆贺 陈晨[3] 明添学 何小虎 谈树成[1,2] 刘梦帆 章荣清 刘兵兵[6] YAN QingHe;CHEN Chen;MING TianXue;HE XiaoHu;TAN ShuCheng;LIU MengFan;ZHANG RongQing;LIU BingBing(School of Earth Sciences,Yunnan University,Kunming 650500,China;Yunnan International Joint Laboratory of Critical Mineral Resource,Kunming 650500,China;Center of Deep Sea Research,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Yunnan Geological Survey,Kunming 650216,China;School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;School of Geographical Sciences,Lingnan Normal University,Zhanjiang 524048,China)

机构地区：[1]云南大学地球科学学院,昆明650500 [2]云南省关键矿产成矿过程和机制国际联合实验室,昆明650500 [3]中国科学院海洋研究所深海研究中心,青岛266071 [4]云南省地质调查院,昆明650216 [5]南京大学地球科学与工程学院,南京210023 [6]岭南师范学院地理科学学院,湛江524048

出　　处：《岩石学报》2024年第2期539-552,共14页Acta Petrologica Sinica

基　　金：云南省地质勘查基金管理中心新一轮找矿行动科研项目(Y202305);云南省基础研究专项(202301AT070309);云南省教育厅科技创新团队项目(CY22624109)联合资助。

摘　　要：稀有金属锂矿是我国紧需的战略性矿产资源。滇西地区是我国重要的稀有金属成矿远景区,但目前区内已知的稀有金属资源主要为Be-Nb-Ta-Sn矿,鲜有锂矿的报道。本研究首次在滇西高黎贡山培里地区发现了锂辉石伟晶岩型锂矿,为云南省新增一处有潜力的锂辉石型伟晶岩锂矿床,对区域稀有金属锂矿床的找矿工作具有重要意义。6个样品的全岩主微量元素分析显示培里地区伟晶岩主要发育有Li、Be、Rb、Cs、Nb、Ta矿化。LA-ICP-MS铌钽矿U-Pb年代学结果显示培里地区锂矿伟晶岩形成于18.4±0.3Ma,这一结果与共生的锡石U-Pb年代学(17.5±1.2Ma)结果一致,表明其为新生代成岩成矿作用产物。这一成矿年代与高黎贡山地区变质年代以及淡色花岗岩成岩年代一致,暗示培里伟晶岩可能为变质重熔产物,也可能是淡色花岗岩进一步结晶分异的产物。在大区域尺度上,该成矿事件与藏南稀有金属成矿时代一致,结合区域显著的地球化学背景异常,我们认为滇西地区可能是喜马拉雅稀有金属成矿带的南延部分,具有良好的稀有金属锂矿找矿前景。Lithium is critical mineral resource in China.Western Yunnan is an important metallogenic area of rare metals in China,but at present,the main reported rare metal resources in the area are Be-Nb-Ta-Sn.In this study,we first report the newly discovered Peili spodumene pegmatitic lithium deposit,Gaoligong area,western Yunnan Province,which is of great significance for the further prospecting of lithium in this area.Whole rock trace element analysis of 6 samples shows that the pegmatites in Peili area are characterized by Li,Be,Rb,Cs,Nb and Nb mineralization.The LA-ICP-MS coltan U-Pb analysis shows that the lithium-pegmatite in Peili area was formed at 18.4±0.3Ma,which is consistent with the cassiterite U-Pb dating age(17.5±1.2Ma),indicating Peili pegmatites formed in Cenozoic.Moreover,this age is consistent with the metamorphic age and the forming age of leucogranite in Gaoligongshan area,which suggest pegmatites in Peili might be the product of metamorphic remelting,or the product of further crystallization differentiation of leucogranite.In addition,the ages of pegmatites in this study are consistent with the rare metal metallogenic age in South Tibet,which,combined with the significant regional geochemical anomalies of lithium,suggest the western Yunnan region may be the southern extension of the Himalayan rare metal metallogenic belt with good ore-forming condition for rare metal lithium deposits.

关 键 词：滇西培里 伟晶岩型锂矿床 高黎贡 青藏高原 藏南稀有金属成矿带 

分 类 号：P588.131[天文地球—岩石学] P597.3[天文地球—地质学] P618.71