投稿时间：2024-10-18
修订日期：2025-08-26
网络发布日期：2025-10-31
中文摘要:阿尔金卡尔恰尔萤石矿床的控矿花岗岩为一套富氟碱长花岗岩，为了探究富氟花岗岩液态不混溶演化过程及其与萤石成矿的关系，文章在详尽野外调查的基础上，对矿区岩、矿石地球化学及流体包裹体特征进行了研究。结果表明，碱长花岗岩发育“眼球”状析离体、萤石矿化囊包体，伟晶岩发育格架状石英及刀片状石英等岩浆液态不混溶地质标志。碱长花岗岩、萤石方解石脉、花岗伟晶岩存在SiO2、Na2O、K2O组分分离，花岗伟晶岩与萤石方解石脉的Nb/Ta 、Zr/Hf值较碱长花岗岩明显增大，δEu、（La/Yb）N、Sr、Ba等具有明显突变现象。碱长花岗岩、萤石方解石脉、花岗伟晶岩中各类包裹体共生现象普遍，均一温度和盐度表明它们被捕获于不均匀体系。上述证据表明，岩浆液态不混溶作用是研究区富氟碱长花岗岩演化的主要机制，制约着岩浆演化晚期至热液阶段的岩浆分异演化和萤石富集成矿过程，液态不混溶作用对于矿床的形成有重要贡献。
Abstract:The Kaerqiaer fluorite deposit in Altyn is genetically controlled by a fluorine-rich alkali-feldspar granitic intrusion. To investigate the liquid immiscibility evolution process of F-rich granite and its relationship with fluorite mineralization in the deposit area, based on detailed field surveys, this study has carried out research on the geochemical characteristics of rocks and ores as well as the fluid inclusion features at Kaerqiaer. Numerous field indicators of magmatic liquid immiscibility were observed, such as “eye-shaped” segregations and fluorite-mineralized enclaves in alkali-feldspar granite, and shelf-like quartz or blade-like quartz in pegmatites. There exist compositional fractionations of SiO2, Na2O, and K2O among the alkali-feldspar granite, fluorite-calcite veins, and granitic pegmatite. Compared with the alkali-feldspar granite, the granitic pegmatite and fluorite-calcite veins show significantly higher Nb/Ta and Zr/Hf ratios, along with obvious abrupt changes in δEu, (La/Yb)N, Sr, and Ba values. The co-existence of various inclusions is widespread in alkali-feldspar granite, fluorite-calcite veins and granitic pegmatite, and the homogenization temperatures and salinities of these inclusions indicate that they were trapped in a heterogeneous system. These evidences indicate that magmatic liquid immiscibility is the primary mechanism governing the evolution of F-rich alkali-feldspar granite in the study area. This process constrains the magmatic differentiation and fluorite mineralization process from the late magmatic stage to the hydrothermal stage. Consequently, magmatic liquid immiscibility makes a significant contribution to the formation of the fluorite deposit.
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基金项目:本文得到中国煤炭地质总局科技创新项目（编号:ZMKJ-2025-ZX04-3）、新疆维吾尔族自治区地质勘查基金项目（编号：J24-XJ20）、河北省战略性关键矿产研究协同创新中心开放基金课题（编号：HGUXT-2023-3）和自然资源部“战略化工矿产成矿理论及找矿技术创新团队”（编号：ZHTD202401-05）联合资助
引用文本：
金松,高立湧,张成信,胡中国,姚志宏,李英杰,姜振宁,代晓光,王猛,李健.2025.阿尔金卡尔恰尔萤石矿区富氟花岗岩体的液态不混溶作用与成矿[J].矿床地质,44(5):1095~1113JIN Song,GAO LiYong,ZHANG ChengXin,HU ZhongGuo,YAO ZhiHong,LI YingJie,JIANG ZhenNing,DAI XiaoGuang,WANG Meng,LI Jian.2025.Liquid immiscibility of fluorine-rich granite and its relationship with minera-lization in Kaerqiaer fluorite deposit, Altyn[J].Mineral Deposits44(5):1095~1113
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