本项目将首先建立起不依赖双稀释剂的高精度非传统Nd同位素分析方法，该方法的关键在于通过尝试不同的离子交换树脂的组合，建立可以实现接近百份之一百回收Nd，而且能将Ce和Sm完全分离到不影响Nd同位素质谱测量的化学纯化流程，以及利用标准-样品-标准的测量模式（SSB）进行外部分馏校正，在MC-ICPMS上精确测定Nd的各个同位素的非传统同位素组成。在此方法的基础上，拟对各种地质标准物质以及代表性地质单元的样品进行测试，从而了解稳定Nd同位素组成在壳幔主要地质单元的分布概况。

This project will first establish the analytical method for high precision non-tradition Nd isotopes without the inconvenience of employing double spikes. The key point of this method is to set up an ion-exchange chromatographic procedure by trying different combination of various resins, which enables 100 percent recovery for Nd, and totally removes the Ce and Sm to diminish their interference during machine measurement. After that, the non-traditional Nd isotopes will be precisely measured on a MC-ICPMS by using the standard-sample-standard bracketing (SSB) technique to calibrate the mass-bias during the measurements. Based on this method, we will measure the stable Nd isotopes of the generally-used geological standard references that cover various kinds of rock types and a series of samples from typical geological bodies to figure out the general distribution of the non-traditional stable Nd isotope in the crust and the mantle.