稳定Sr-Nd同位素体系及其对传统放射成因锶钕同位素组成的影响  

Stable strontium and neodymium isotopic systematics and their influence on the traditional radiogenic Sr and Nd isotopic compositions

作　　者：韦刚健[1] 马金龙[1] 刘颖[1] 徐义刚[1] 

机构地区：[1]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,广东广州510640

出　　处：《地学前缘》2015年第5期136-142,共7页Earth Science Frontiers

基　　金：国家自然科学基金项目(41325012;41373006);中国科学院广州地球化学研究所135项目(Y234091001)

摘　　要：稳定Sr、Nd同位素是全新的体系,其重点关注自然过程中稳定Sr和Nd同位素分馏特征与控制机制。这方面的知识可以修正传统Rb-Sr和Sm-Nd同位素体系中恒定的稳定Sr、Nd同位素组成的前提假设所带来的认知偏差,补充和完善其知识体系。介绍了稳定Sr、Nd同位素体系的基本概念,综述并点评了最新的分析技术进展,并对稳定Sr、Nd同位素分馏对传统的放射成因Sr、Nd同位素组成的影响进行评估,同时对这两个新的稳定同位素体系的潜在研究应用进行展望。The stable strontium and stable neodymium isotopic systematics mainly study the fractionation of stable Sr and Nd isotopes in natural geological processes, aiming to figure out the characteristics of such fractionation and to seek for their mechanisms. This challenges the pre-assumption for the traditional Rb-Sr and Sm-Nd isotopic systematics that there is no fractionation for stable Sr and Nd isotopes in geological processes and the stable Sr and Nd isotopic ratios are constants for geological samples. The knowledge of the stable Sr and Nd isotopes will correct the bias derived from such inappropriate pre-assumption and improve our understanding of the Rb-Sr and Sm-Nd isotopic systematics. We here introduce the main terms of the stable Sr and Nd isotopic systematics, critically review the latest progress in high-precision analysis of stable Sr and Nd isotopic compositions, make some assessments on the influence of stable Sr and Nd isotopic fractionation on traditional 87Sr/86Sr and raNd/144 Nd ratios, and finally address some potential applications of stable Sr and Nd isotopes. This provides a brief but comprehensive introduction on the new stable isotopic systematics.

关 键 词：稳定锶钕同位素 分馏 高精度分析技术 对传统认识影响评估 潜在应用前景 

分 类 号：P597.2[天文地球—地球化学]