锡林浩特石灰窑铷多金属矿床白云母^(40)Ar-^(39)Ar年代及找矿前景分析  

^(40)Ar-^(39)Ar Dating of the Muscowite and Regional Exploration Prospect of Shihuiyao Rubidium-Multi-metal Deposit,Selenhot,Inner Mongolia

作　　者：孙艳[1] 王瑞江[1] 李建康[1] 赵芝[1] 

机构地区：[1]中国地质科学院矿产资源研究所

出　　处：《地质论评》2015年第2期463-468,共6页Geological Review

基　　金：中国地质调查局项目"我国三稀金属资源战略调查"(编号1212011220803);"我国稀有;稀散资源战略调查及研究"(编号1212011220805);"我国重要矿产和区域成矿规律研究"(编号1212010633903);全国重要矿产潜力评价成果集成(编号12120114051301)的成果

摘　　要：铷是重要的稀有金属之一,除应用于军工部门和科学技术领域外,还应用于众多民用领域。内蒙石灰窑铷多金属矿是2010年新发现的以铷为主要矿种的超大型稀有金属矿床。本文在对石灰窑地质特征详细野外调研的基础上,重点开展了白云母^(40)Ar-^(39)Ar定年研究,分别测得了石灰窑矿床云英岩化花岗岩内白云母的坪年龄(加权平均年龄)为144.7±1.1Ma,等时线年龄为143.3±1.4Ma;伟晶岩脉中片状白云母的坪年龄(加权平均年龄)为146.4±1.0Ma,等时线年龄为143.9±1.5Ma,厘定了矿床成矿时代为燕山晚期。石灰窑地区褶皱强烈、断裂发育,岩浆活动频繁而分布广泛,区内分布有规模较大的天河石化花岗岩、云英岩化花岗岩及部分花岗伟晶岩,钠长石化作用普遍分布,利于铷、铌、钽、锂、铍等稀有金属发生沉淀和聚集,具有较大的成矿潜力。Rubidium is one of the important rare metals, which has been used in military and science-- technological fields and even widely in civil use field. The Shihuiyao rubidium--multi-metal deposit in Selenhot, Inner Mongolia was discovered as an ultra-large scale rare metal deposit in 2010. Based on detailed field geological investigation, muscovite 40Ar-39Ar isotopic dating was carried out. The results show that the weighted average age of muscovite in greisenization granite is 144.7 ± 1.1 Ma, and the isochron age is 143.3 ± 1.4 Ma. The weighted average age of schistose muscovite in quartz vein is 146.4 ± 1.0 Ma, and the isochron age is 143.9± 1.5 Ma. It is shown that the Shihuiyao rubidium--multi-metal deposit was formed at late Yanshanian. Shihuiyao area has strong fold , development fracture, frequently and widely distribute magmatic activity. These are major scale amazonitization granite , greisenization granite and parts of greisenization granite. Greisenization is widely distribute. These are all beneficial to rare elements to sediment and assemble such as rubidium, niobium, tantalum, lithium and beryllium etc. So there is great potential for the prospecting of rear metal deposit in the area.

关 键 词：石灰窑 铷矿床 稀有金属 40Ar-39Ar年代学 找矿前景 

分 类 号：P618.2[天文地球—矿床学] P597.3[天文地球—地质学]