Re-Os Investigations of Craton Development and Mantle Evolution

该项目将继续进行一系列Re-Os同位素研究，旨在研究太古代克拉通的形成、岩石圈地幔的组成和年龄、岩石圈和软流圈之间的相互作用以及地幔的化学演化。不同时代的不同样品将被分析：1.8-3.3Ga科马提岩-玄武岩；2.7-3.8GA奥长花岗闪长岩-英云闪长岩-花岗闪长岩；橄榄岩地幔包体；造山二辉橄榄岩；以及大陆镁铁质和碱性熔岩。为了了解Re和Os在地幔富集过程中的行为，将进行Re和Os在碳酸盐岩-硅酸盐液体之间的分配实验。这项研究将把Re-Os同位素数据与来自一个或多个这些常规同位素系统的数据(加上主元素和微量元素数据)结合起来。DTM的Re、Os丰度和Os同位素组成将用负热电离质谱仪(NTIMS)分析。这一结果不仅应该对地壳-地幔关系有新的了解，而且还将对开发一种新的令人兴奋的分析技术做出重大贡献。

This project is to continue a series of Re-Os isotopic investigations designed to address the formation of Archean cratons; the composition and age of lithospheric mantle, the interaction between the lithosphere and asthenosphere and the chemical evolution of the mantle. Diverse samples of different ages will be analyzed: 1.8 - 3.3 Ga komatiites to basalts; 2.7-3.8 GA trondhjemites-tonalite-granodiorites; peridotitic mantle xenoliths; orogenic lherzolites; and continental mafic and alkalic lavas. Partitioning experiments for Re and Os between carbonatite-silicate liquids will be conducted to understand the behavior of Re and Os during mantle enrichment processes. The research will combine Re-Os isotopic data with data from one or more of these conventional isotopic systems (plus major and trace element data). Re and Os abundances and Os isotopic compositions will be analyzed at DTM by negative thermal ionization mass spectrometry (NTIMS). The results should not only shed new light on crust-mantle relationships, but also contribute significantly to the development of a new and exciting analytical technique.