阿尔金中段吐格曼北花岗伟晶岩型锂铍矿床多阶段岩浆-成矿作用  

Multi-stage magmatism-mineralization and tectonic setting of the North Tugeman granitic pegmatite lithium-beryllium deposit in the middle of Altyn Tagh

作　　者：李杭 洪涛 杨智全 刘善科[3,7,8] 王学海 马垠策 牛磊 徐兴旺 LI Hang;HONG Tao;YANG ZhiQuan;LIU ShanKe;WANG XueHai;MA YinCe;NIU Lei;XU XingWang(College of Architecture and Civil Engineering,Sanming University,Sanming 365004,China;Fujian Provincial Key Laboratory of Engineering Material and Structure Reinforcement,Sanming 365004,China;Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Guangdong Provincial Key Lab of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-Sen University,Guangzhou 510275,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China;No.3 Geological Party,Xinjiang Bureau of Geology and Mineral Exploration and Development,Korla 841000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]三明学院建筑工程学院,三明365004 [2]工程材料与结构加固福建省高等学校重点实验室,三明365004 [3]中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京100029 [4]中山大学地球科学与工程学院,广东省地球动力作用与地质灾害重点实验室,广州510275 [5]南方海洋科学与工程广东省实验室(珠海),珠海519000 [6]新疆地质矿产勘查开发局第三地质大队,库尔勒841000 [7]中国科学院大学,北京100049 [8]中国科学院地球科学研究院,北京100029

出　　处：《岩石学报》2022年第10期3085-3103,共19页Acta Petrologica Sinica

基　　金：中国科学院地质与地球物理研究所重点部署项目(IGGCAS-201902);第二次青藏高原综合科学考察研究(2019QZKK0802);福建省自然科学基金资助项目(2022J011184)联合资助。

摘　　要：花岗伟晶岩型稀有金属矿床多阶段成岩成矿是近年来伟晶岩型矿床成因研究的热点与前沿问题。吐格曼北花岗伟晶岩型锂铍矿床是阿尔金中段地区近年来新发现的稀有金属矿床,一些伟晶岩脉发育并保存复杂的分带及多期多阶段的成岩成矿现象。本文在介绍吐格曼北锂铍伟晶岩中多期多阶段成岩成矿现象的基础上,选择ρ31伟晶岩脉中包含锡石与锂辉石角砾的白云母钠长花岗岩(20AE43-3)、ρ87伟晶岩脉深部的细晶花岗岩(ZK8702-79.3)与TC87探槽中发育含铌钽铁矿细晶花岗岩(20TC8701-1-1)及其中的含铌钽铁矿-白云母伟晶岩(20TC8701-1-2)开展锆石与铌钽铁矿的LA-ICP-MS测年研究。结果显示:1)ρ31伟晶岩脉中含锡石与锂辉石角砾的白云母钠长花岗岩锆石U-Pb年龄为436.0±1.1Ma;2)ρ87伟晶岩脉深部的细晶花岗岩锆石U-Pb年龄为415.4±1.5Ma;3)ρ87伟晶岩脉TC87探槽中含铌钽铁矿细晶花岗岩及其中铌钽铁矿-白云母伟晶岩的铌钽铁矿U-Pb年龄分别为434.6±2.8Ma与414.7±3.0Ma。综合前人发表的测试分析结果,本文指出吐格曼北锂铍矿区存在三期成岩成矿作用:468~454Ma、436~434.6Ma与415.4~414.7Ma。结合区域构造演化与花岗岩发育特征,我们认为吐格曼北锂铍矿区发育的三期锂铍花岗岩-伟晶岩成岩成矿作用分别形成于阿中地块与阿南地块的后碰撞伸展阶段、阿中地块与阿北地块的碰撞阶段以及阿尔金地块与东昆仑地块的后碰撞伸展阶段。The multi-stage diagenesis and mineralization of granitic pegmatite type rare metal deposits is a focused issue in the genetic research of pegmatite type deposits.The North Tugeman lithium-beryllium deposit is a newly discovered rare metal deposit in the middle Altyn area.Some pegmatite dikes preserved complex zonation and developed multi-stage diagenesis and mineralization phenomenon.A combined study towards the introduction of multi-stage diagenesis and mineralization in the North Tugeman lithium beryllium pegmatite basing on the LA-ICP-MS dating of zircon and coltan from the cassiterite-spodumene-bearing breccia muscovite albite granite(20 AE43-3)inρ31 pegmatite dike,the finely crystalline granite(ZK8702-79.3)inρ87 pegmatite dike,the coltan-bearing finely crystalline granite(20 TC8701-1-1)and the coltan-bearing muscovite pegmatite(20 TC8701-1-2)in TC87 exploratory trench was carried out.The results indicate that:1)theρ31 cassiterite-spodumene-bearing breccia muscovite albite granite has a concordant U-Pb age of 436.0±1.1 Ma of zircon;2)theρ87 finely crystalline granite has a concordant U-Pb age of 415.4±1.5 Ma of zircon;3)theρ87 coltan-bearing finely crystalline granite has a U-Pb age of 434.6±2.8 Ma of coltan and coltan-bearing muscovite pegmatite has a U-Pb age of 414.7±3.0 Ma of coltan.Integrated with the published test and analysis results,we propose that there are three stages of diagenesis and mineralization in the North Tugeman lithium-beryllium deposit:468~454 Ma,436~434.6 Ma,and 415.4~414.7 Ma.It is suggested that the three stages of lithium-beryllium granite-pegmatite diagenesis and mineralization are correspondent to the post-collision extension stage of the Central Altyn and the South Altyn blocks,the collision stage of the North Altyn and the Central Altyn blocks,and the post-collision extension stage of the Altyn and the East Kunlun blocks,respectively.

关 键 词：锆石U-PB定年 铌钽铁矿U-Pb定年 稀有金属伟晶岩 吐格曼北锂铍矿 

分 类 号：P588.131[天文地球—岩石学] P597.3[天文地球—地质学] P618.7