摘要
铈在自然界中属变价元素,可导致地质样品La-Ce与Sm-Nd同位素体系之间发生脱偶现象.除了在同位素年代学中的应用外,放射成因Ce同位素地球化学在地壳物质再循环示踪、地球表层演化过程中的氧化—还原事件和成矿作用等研究领域具有独特优势.总结了La-Ce同位素体系目前的应用现状及其尚存在的问题,并对实验技术与应用的发展趋势进行了分析.介绍了采用无机酸进行La-Ce同位素样品化学制备的实验流程及应用该流程对部分国际标样和扬子克拉通核部辉长岩样品进行Ce同位素分析的结果.
Element Ce shows variable valences in the nature, which accounts for the decoupling between La-Ce and Sm-Nd isotopic system. In addition to a radiometric application, the La-Ce system thus sheds new light on a set of studies such as crust recycling in mantle components, oxidation events during outer sphere evolution of the Earth and metallogenesis. This paper consists of two parts. The first part summarizes the application status of the La-Ce system, its analytical problem faced as well as developing trends in experimental technique and geological application. The second half describes a new chemical procedure for La-Ce separation and purification. Analytical results for some USGS standards and some gabbroic rocks from the Neoproterozoic Huangling complex, interior of the Yangtze craton, are also reported.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2011年第1期33-42,52,共11页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金项目(Nos.40673025
40873017)
