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.
出处
《地质学报》
EI
CAS
CSCD
北大核心
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
