本项目拟建立利用84Sr-87Sr和145Nd-150Nd双稀释剂的高精度稳定Sr、Nd同位素组成的分析方法，优化完善地质样品的稳定Sr-Nd同位素分析技术体系。依靠这一技术，对多个不同岩浆性质的代表性岩体（青湖花岗岩，汤塘花岗岩，鲁西的济南-邹平的辉长岩,和南非TTG）的各主要矿物开展综合的Rb-Sr、Sm-Nd年代学和稳定Sr-Nd同位素体系研究，特别是对这些岩体中各种矿物的稳定/放射成因Sr和Nd同位素组成进行精确分析，目的在于了解岩浆结晶形成岩石初始时期不同矿物稳定Sr-Nd同位素的差异，探讨导致这种差异的控制因素和机制。在此基础上，通过构建矿物内部等时线等方法并定量估算这些不同岩浆体系下各结晶矿物初始稳定Sr-Nd同位素组成的差异对岩体对年龄及初始放射成因同位素组成的结果的影响，评估并其对一些传统认识可能带来的偏差。

In this project, we will carry out the high-precision measurement of stable Sr-Nd isotopes by using 84Sr-87Sr double-spike and 145Nd-150Nd double-spike in MC-ICPMS, respectively. Based on this method, we will choose Qinghu granite, Tangtang granite, Jinan-Zouping gabbros and South Africa TTG as our research subjects to carry out the Rb-Sr and Sm-Nd isochron and to measure stable and radiogenic strontium-neodymium isotopic systematics, especially for these minerals in each rock. Our aims are to observe the stable Sr-Nd isotopic fractionation in minerals of each rock and probe the mechanism of stable isotope fractionation in minerals. Then, we will evaluate the influence of the variation of stable Sr-Nd isotopes in minerals on the traditional isotopic systems of Rb-Sr and Sm-Nd, especially in precision of isochron of mineral and tracing provenance using initial radiogenic Sr-Nd isotopes.