太古代克拉通为研究地球早期地壳演化提供了重要证据。华北克拉通是世界上最古老的克拉通之一，研究表明其至少由独立演化的东部和西部块体，以及经俯冲/碰撞拼合而形成的中部造山带三部分组成。关于华北克拉通前寒武纪地质，现有的研究大部分集中在华北中部及北部地区，对华北克拉通南缘基底构造演化研究相对薄弱。长石是花岗质岩石中的重要矿物，具有高普通Pb和低Th，U含量的特点，使其形成后的放射性增长可以忽略不计，因此长石Pb同位素组成对于示踪岩石成因和物质来源具有重要意义。本项目拟以华北克拉通南缘嵩山地区前寒武纪花岗质岩石为研究对象，在岩相学观察的基础上，通过高精度长石Pb同位素原位微区分析和系统的锆石学(微量元素、氧同位素、Lu-Hf 和 U-Pb 同位素)研究，结合全岩主微量元素分析，探讨其岩石成因和源区物质组成，进一步理解岩石形成过程中发生的壳-幔相互作用，最终探索华北克拉通南缘前寒武纪地壳演化过程。

Archean Craton provide important information to understand crustal evolution processes in the early history of the Earth. The North China Craton (NCC) is one of the oldest cratons in the world, with widespread Archean to Paleoproterozoic basement. A new progress in understanding the evolution of the NCC has resulted in a broad consensus that the NCC comprises at least the independently-developed Eastern and Western Blocks separated by the Trans-North China Orogen. The Precambrian crustal evolution of the NCC has been investigated intensively in the last two decades. These studies mainly focused on the central and the northern margin of the NCC, little has been done on the southern margin of the NCC. The Songshan area is situated in the southern margin of the NCC, where Precambrian granitoids are the focus of this study. Feldspar is an important mineral in granitoid rocks. High common Pb and low U, Th content of feldspar makes radiogenic growth after its formation negligible, which is considered as a powerful isotopic tracer of provenance and petrogenetic processes. Based on petrographical observation, the high-precision in-situ analysis on feldspar Pb isotope, microbeam analyses for trace elements, oxygen and Lu-Hf isotopes, and U-Pb ages will be performed on zircons from these granitoids. In addition, whole-rock major and trace elemental analyses will be carried out for the same set of samples. The results will be used to decipher the petrogenesis of the granitoids and the source nature, and their bearing on crust-mantle interaction. This study finally aims to provide important insights into the Precambrian evolution history of the southern margin of the NCC.