辉石岩是上地幔仅次于橄榄岩捕掳体的重要组成部分，包含着丰富的岩石圈演化信息而历来受到学术界的广泛关注，但是对辉石岩的成因和来源的认识仍存在很大分歧。铁是辉石岩的主要造岩元素，同时还是最主要的变价元素之一。铁同位素高精度分析方法的建立为探讨辉石岩的成因和来源研究提供了新的途径。 本项目拟对华北克拉通典型地区（如华北北缘、太行山和郯庐断裂带地区）中、新生代玄武岩携带的不同类型辉石岩捕掳体和矿物捕掳晶Fe同位素组成进行系统研究，厘定各类辉石岩捕掳体及其捕掳晶Fe同位素组成范围及在各矿物间的分馏关系，并结合详细的岩石学和传统同位素地球化学研究，探讨华北克拉通各类辉石岩的成因和来源，从而为我国华北岩石圈的破坏和减薄过程提供Fe同位素地球化学制约。

Pyroxenites, the second most common ultramafic rock type after spinel peridotites in the upper mantle, have received much attention in recent years. However, the nature and origin of pyroxenites still remain hotly debated. As Fe is a major element that occurs in two different oxidation states (Fe2+ and Fe3+) in the constituent minerals of the pyroxenites, Fe isotopes may also provide new insights into the nature and origin of pyroxenites beneath the North China Craton. This project, as target on the mantle pyroxenite xenoliths and xenocrysts entrained in Mesozoic and Cenozoic basalts occurred in the typical regions of the North China Craton(e.g. the northern margin、Taihang mountain and Tanlu fault zone areas)and utilizing the recently-imported Fe isotopic analytical technique, is designed to investigate the extent of Fe isotope variations in pyroxenite xenoliths and xenocrysts, as well as addressing the nature and origin of different kinds of pyroxenites, through the systematic Fe isotopic analyses on these mantle pyroxenite xenoliths and xenocrysts, and combined with the detailed studies on petrology and traditional geochemistry. This project finally tries to provide the Fe isotopic constraints on the destruction and thinning processes of the lithosphere of the North China Craton.