川西可尔因锂矿田外围黑云母花岗岩类成因及对伟晶岩型稀有金属成矿作用的指示
Genesis of biotite granites in the periphery of the lithium field of the Ke'eryin mine in western Sichuan and their indications for pegmatite-type rare metal mineralization
摘要
Abstract
[Objective]This study selected two types of biotite granitic bodies(Yanggonghai and Ermaoshan)with different degrees of pegmatite development on the periphery of the Ke'eryin lithium ore field in the Songpan-Ganzi orogenic Belt,and compared them with the Ke'eryin pluton,the parent rock of lithium-bearing pegmatite in the region,to explore their potential for rare metal mineralization.[Methods]Through comprehensive studies of chronology,geochemistry and isotopes,the rock genesis and tectonic background are constrained.[Results]Zircon U-Pb dating shows that the crystallization age of the Ermaoshan rock pluton is 208.19±0.99 Ma,and that of the Yanggonghai rock pluton is approximately 211 Ma,indicating that both and the parent rock of the lithium pegmatite in the area,the Ke'eryin rock pluton,were formed in the same tectonic background.The elemental geochemical characteristics of both indicate that they are both type I granites,originating from the garnet-plagioclase equilibrium domain in the lower crust of the granitic facies.The SR-Nd isotope system reveals the age of their source regions:Both the Yanggonghai rock pluton and the Ermaoshan rock pluton originated from the Mesoproterozoic crust,and their initial Sr isotope ratios ISr and εNd(t)tend to approach the western margin of the Yangtze Craton.[Conclusions]Although the two types of biotite granites studied are located in the same tectonic background as the Ke'eryin rock pluton,the parent rock of the Ke'eryin lithium ore field,the maturity of their source areas is insufficient and the degree of magmatic differentiation is weak,which is significantly different from the Ke'eryin rock pluton.Therefore,the potential for the formation of pegmatite is weak and large-scale rare metal mineralization is difficult to occur.However,both still have a certain potential for magmatic hydrothermal mineral mineralization.关键词
构造背景/岩浆源区/黑云母花岗岩体/稀有金属/成矿潜力/可尔因锂矿田Key words
tectonic setting/magma source area/Biotite granite rock pluton/rare metal/mineralization potential/Ke'eryin lithium ore field分类
天文与地球科学引用本文复制引用
高原,张皓然,刘晓敏,陈翠华,代鸿章,王登红,李鑫,刘善宝,王成辉,文佳豪..川西可尔因锂矿田外围黑云母花岗岩类成因及对伟晶岩型稀有金属成矿作用的指示[J].地质通报,2026,45(2):261-284,24.基金项目
国家重点研发计划《我国西部伟晶岩型锂等稀有金属成矿规律与勘查技术》(编号:2021YFC22901900、2021YFC22901905)、中国地质科学院深地探测与矿产勘查全国重点实验室基本科研业务费项目(编号:JKYDM2025106)、中国地质调查局项目《战略新兴产业矿产地质调查工程》(编号:DD20230034)、自然资源部新一轮找矿突破战略行动科技支撑项目《松潘-甘孜锂稀有金属矿关键勘查技术与找矿预测模型》(编号:ZKKJ202412),四川大中赫锂业有限公司项目《加达锂矿优选靶区验证地质研究技术服务》(编号:HE2322)、《四川省马尔康市加达锂矿地质详查(勘探)》(编号:HE2327)、《四川省马尔康市加达锂矿地质勘查》(编号:SY-2025-175) Supported by projects of the National Key R&D Program of China(Nos.2021YFC22901900,2021YFC22901905),Basic Scientific Research Fund of the State Key Laboratory of Deep Earth Exploration and Mineral Exploration(No.JKYDM2025106),China Geological Survey Project(No.DD20230034),Scientific and Technological Support Project of the New Round Strategic Action for Mineral Exploration Breakthrough(No.ZKKJ202412),Sichuan Dazhonghe Lithium Industry Co.,Ltd.Project(Nos.HE2322,HE2327,SY-2025-175) （编号:2021YFC22901900、2021YFC22901905）
