地质通报2026，Vol.45Issue(4)：740-755,16.DOI:10.12097/gbc.2024.03.007
西昆仑苦子干碱性杂岩体富稀土霓辉正长岩成矿时代及矿物地球化学特征
Metallogenic age and mineralogical-geochemical characteristics of rare earth element-rich augite syenite in the Kuzigan alkaline complex,Western Kunlun
摘要
Abstract
[Objective]The Taxkorgan area in the western Kunlun Mountains,located on the Muztagh-Aksai Fe-Cu-Au-Pb-Zn metallogenic belt,serves as a significant base for iron and copper polymetallic resources in China.Recent discoveries indicate elevated rare earth element(REE)concentrations within its alkaline intrusive complexes,suggesting promising REE mineralization potential.The Kuzigan alkaline complex,the largest Cenozoic alkaline intrusive body in this region,remains poorly understood regarding its relationship with REE enrichment.[Methods]This study conducted petrographic analyses,whole-rock geochemistry,electron microprobe assays,and zircon LA-ICP-MS U-Pb geochronology on the Kuzigan alkaline complex.[Results]The complex comprises ore-bearing augite syenite,syenite,and granite.All rock types exhibit high total REE concentrations with light REE(LREE)enrichment.Bastnäsite and REE-rich apatite are identified in ore-bearing augite syenite,where bastnäsite crystallized later than rock-forming minerals,closely associated with hydrothermal activity.Zircon dating reveals emplacement ages of 10.9±0.1 Ma(syenite)and 10.2±0.1 Ma(ore-bearing augite syenite).Augite exhibits elevated Na2O and CaO contents,while apatite is characterized by high fluorine(F)and LREE2O3 concentrations.Titanite also shows F enrichment.[Conclusions]Alkaline fluids rich in Na+,K+,and F facilitated REE mobilization and precipitation through complexation,promoting mineralization.These findings suggest favorable prospects for REE exploration in the Kuzigan area.关键词
西昆仑/苦子干碱性杂岩体/霓辉正长岩/LA-ICP-MS锆石U-Pb定年/稀土矿化Key words
West Kunlun/Kuzigan alkaline complex/aegirine syenite/LA-ICP-MS zircon U-Pb dating/REE mineralization分类
天文与地球科学引用本文复制引用
汪滢,沈宏飞,蒋磊,杨佐怀,王翠翠..西昆仑苦子干碱性杂岩体富稀土霓辉正长岩成矿时代及矿物地球化学特征[J].地质通报,2026,45(4):740-755,16.基金项目
新疆重点研发计划项目《低品位难处理铅锌金属矿地采选一体化高效开发利用研究与应用》(编号:2025B04017)、新疆工程学院博士启动金项目《塔里木北缘依兰里克碱性岩成因及Nb-Ta富集机制研究》(编号:2025XGYBQ53)、新疆天池英才引进计划项目《地表原生晕及构造地球化学在穆呼锰矿找矿中的研究与应用示范》(编号:2024XGYTCYC11) Supported by the Key Research and Development Tasks of Xinjiang Uyghur Autonomous Region(No.2025B04017),the Doctoral Startup Fund Project of Xinjiang Institute of Engineering(No.2025XGYBQ53),and the Tianchi Talent Introduction Program of Xinjiang Uyghur Autonomous Region(No.2024XGYTCYC11) （编号:2025B04017）
