绿帘石激光原位Sr同位素分析方法研发

绿帘石广泛分布于自然界的各种岩石之中，作为副矿物它记录了寄主岩石的岩浆、变质或热液等复杂地质过程。绿帘石是一种富Sr贫Rb矿物，适合于微量和微区Sr同位素分析，其Sr同位素组成可有效示踪岩石成因、源区，从微观角度探索复杂地质过程。本项目拟利用申请者所在MC-ICP-MS实验室的193nm激光剥蚀系统和Neptune Plus多接收等离子体质谱，在研制微区原位Sr同位素分析绿帘石标准的基础上，探索绿帘石Sr同位素测定过程中的影响因素，开发相应的干扰校正程序，建立高精度的绿帘石原位微区Sr同位素分析方法。

Epidote is widely distributed in different types of rock in nature. As an accessory mineral, it records the complex geological processes including magmatism, metamorphism or hydrothermal activtity of its host rocks. This mineral typically incorporates considerable amounts of Sr, but has very low Rb content, which makes it suitable for in-situ micro-analysis of Sr isotope. Sr isotopic composition of epidote can effectively constrain the petrogenesis and source, and reveal complex geological processes in micro-scale. This project will use the multiple-collector (MC) ICP-MS equipped with 193nm GeoLas laser to set up in-situ Sr isotopic analytical method in our lab. Based on development of epidote standard for in-situ Sr isotopic analysis, we will evaluate factors that affect the precision and accuracy of in-situ Sr isotopic data and develop their correction procedures. The aim of this project is to establish a high-precision, accurate in-situ Sr isotopic analytical method using LA-MC-ICP-MS in our lab for geologists to provide an experimental platform.