大兴安岭北部砂宝斯金矿床含金石英脉^40Ar／^39Ar年龄及其构造意义  

^(40)Ar/^(39)Ar Dating of Gold-Bearing Quartz Vein from the Shabaosi Gold Deposit at the Northern End of the Great Xing'an Range and Its Tectonic Significance

作　　者：刘军[1] 武广[1] 邱华宁[2] 高德柱 杨鑫生 

机构地区：[1]中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室,北京100037 [2]中国科学院广州地球化学研究所同位素地球化学国家重点实验室,广州510640 [3]内蒙古自治区第十地质矿产勘查开发院,内蒙古赤峰024000 [4]河南省灵宝市金源矿业有限责任公司,河南灵宝472500

出　　处：《地质学报》2013年第10期1570-1579,共10页Acta Geologica Sinica

基　　金：国家自然科学基金项目(41202058和41172081);云南驰宏资源勘查开发有限公司科研项目(201107ZKJS-01);中国地质调查局地质调查项目(1212011085260)共同资助的成果

摘　　要：砂宝斯金矿床是大兴安岭北部唯一一个大型岩金矿床。本文应用石英真空击碎和阶段加热40 Ar/39 Ar定年技术,首次获得了砂宝斯金矿床的成矿年龄。石英真空击碎40Ar/39Ar定年方法获得了石英脉中原生包裹体等时线年龄为130.1±1.3Ma;石英粉末阶段加热40 Ar/39 Ar定年方法获得石英脉中钾长石微晶的等时线年龄为133.1±3.5Ma。石英脉中原生包裹体和钾长石微晶的年龄较吻合,~130Ma代表了含金石英脉的形成年龄。砂宝斯金矿床的成矿时代为早白垩世,形成于蒙古-鄂霍茨克造山带后碰撞阶段的挤压向伸展转换期。The Shabaosi gold deposit is only a large gold deposit in the northern Great Xing^an Range. Basing on quartz 40Ar/39ArAr dating （crushing in vacuum and stepwise heating on crushed powders）, we firstly obtained the ore-forming age of the Shabaosi gold deposit. The crushing experiment yielded an isochron age of 130.1±1.3 Ma for primary fluid inclusions of quartz veins. The40Ar/39ArAr dating by heating quartz power yielded an isochron age of 133.1±3.5 Ma for the microcrystal potash feldspars in quartz veins. The age of primary fluid inclusions in the quartz veins is coupled with that of the microcrystal potash feldspars and -130 Ma may represent the forming age of Au-bearing quartz veins. The Shabaosi deposit was formed in the Early Cretaceous in a tectonic transition setting of the post-collisional regime of the Mongolia- Okhotsk orogeny from compression to extension.

关 键 词：40Ar/39Ar定年 真空击碎 阶段加热 砂宝斯金矿 蒙古-鄂霍茨克造山带 

分 类 号：P618.51[天文地球—矿床学]