镁铁-超镁铁岩铼-锇同位素体系分析方法  

Study on Analytical Method for Re-Os Isotopic System in Mafic-Ultramafic Rocks

作　　者：孟庆[1] 郑磊[1] 夏琼霞[1] 靳永斌[1] 支霞臣[1] 

机构地区：[1]中国科学技术大学地球和空间科学学院,安徽合肥230026

出　　处：《岩矿测试》2004年第2期92-96,共5页Rock and Mineral Analysis

基　　金：国家自然科学基金项目(40173009);国家高等教育博士点科研基金项目(1999035816)

摘　　要：通过试验建立了镁铁-超镁铁岩Re Os同位素体系分析方法,包括Re Os的化学分离纯化流程,Re同位素比值的电感耦合等离子体质谱测量方法和Os同位素比值的负离子热电离质谱测量方法。化学流程包括Carius管溶样,小型蒸馏分离Os,微蒸馏纯化Os,阴离子交换法分离、纯化Re。用该流程测定了汉诺坝幔源橄榄岩、辉石岩捕虏体和大别山饶拔寨超镁铁岩样品的Re、Os含量和Os同位素比值。The analytical method for Re-Os isotopic system in Mafic-Ultramafic rocks was established in our laboratory. Sample digestion, chemical separation and purification of Re and Os, as well as the determination of Re isotope ratio by ICP-MS and determination of Os isotope ratio by NTIMS were involved. Samples were digested in Carius tube and Os was separated using mini-distillation and purified with micro-distillation method. Re was separated using anion exchange chromatography. The contents of Re,Os and Os isotope ratio of mantle-derived Hannuoba peridotite, pyroxenite xenolith and Raobazhai ultramafic rocks were determined by this method.

关 键 词：铼-锇同位素体系 小型蒸馏 微蒸馏 阴离子交换 Carius管溶样 

分 类 号：O614.824[理学—无机化学] O614.713[理学—化学]