内蒙古中西部特大型萤石矿集区成矿作用探讨  

Mineralization of Supper-Large Fluorite Ore-concentrated Area in Central and Western Inner Mongolia

作　　者：胡华斌 牛树银 孙爱群 张碧野 陈超 张福祥 何江涛 HU Hua-bin;NIU Shu-yin;SUN Ai-qun;ZHANG Bi-ye;CHEN Chao;ZHANG Fu-xiang;HE Jiang-tao(Hebei GEO University,Shijiazhuang 050031,China;Beijing Geology Development Group Corporation,Beijing 100050,China)

机构地区：[1]河北地质大学,河北石家庄050031 [2]北京市地质矿产勘查开发集团有限公司,北京100050

出　　处：《河北地质大学学报》2023年第4期125-130,共6页Journal of Hebei Geo University

基　　金：国家重点研发计划项目(2019YFC0605202)。

摘　　要：内蒙古中西部产有3个特大型萤石矿床,分别是阿巴嘎旗李瑛萤石矿床、四子王旗西里庙—苏莫查干敖包萤石矿床和额济纳旗东七一山萤石矿床。通过对东七一山矿集区与萤石有关的4个碱性花岗质岩体进行锆石LA-ICP-MS U-Pb测年,获得了4个岩体的结晶年龄在219~223 Ma之间,说明矿床的形成与晚三叠世构造—岩浆作用有关。综合研究认为:西里庙—苏莫查干敖包特大型萤石矿床和李瑛萤石矿床的成矿年龄在126~142 Ma之间,是滨太平洋构造背景下中酸性花岗质岩浆作用的产物。3个特大型萤石矿床均是岩浆-热液成矿作用形成,完整的萤石成矿系统包括高温矽卡岩型、中低温热液交代型和低温热液充填型3种成矿作用,成矿流体经历了从高温到中低温的演化过程。There are three super-large fluorite deposits in Central and Western Inner Mongolia,which are Liying fluorite deposit in Abaga Banner,Xilimiao-Sumoqa Obo fluorite deposit in Siziwang Banner,and Dongqiyishan fluorite deposit in Ejina Banner.In this paper,the zircon ages of 219~223 Ma for the four alkaline granitic plutons from Dongqiyishan fluorite deposit obtained with the LA-ICP-MS U-Pb dating indicate that they were related to the late Triassic tectonic-magmatism.The comprehensive study concluded that mineralizing ages between 126 and 142 Ma for the Xilimiao—Sumoqa Obo super-large fluorite deposit and Liying supper-large fluorite deposit were related to the medium-acidic granitic magma from Peri-Pacific tectonic tract.The three super-large fluorite deposits were formed by magma-hydrothermal mineralization.Whole fluorite mineralization system consists of three types(high temperature skarn type,medium and low temperature hydrothermal metasomatic type and low-temperature hydrothermal filling type).The mineralization fluid went through the evolutionary process from high temperature to medium low temperature.

关 键 词：萤石 特大型矿床 成矿时代 成矿作用 内蒙古 

分 类 号：P611[天文地球—矿床学]