项目将对华北克拉通岩石圈显生宙破坏前后的下地壳开展对比研究。将华北克拉通出露的前寒武纪地体麻粒岩以及华北不同地区古生代金伯利岩中的下地壳麻粒岩捕虏体和源自下地壳的捕虏晶做为克拉通破坏前的下地壳代表，将中、新生代火山岩和侵入岩中的下地壳麻粒岩捕虏体和捕虏晶视为克拉通破坏不同阶段的华北下地壳代表，利用矿物学、岩石学、元素地球化学和多元同位素地球化学等综合研究手段，包括锆石原位U-Pb年代学、Hf-O同位素等，揭示华北克拉通破坏过程中，下地壳在年龄，厚度、物质组成等方面的变化，探讨下地壳改造的方式、期次、程度以及在区域上的差异和影响因素等。结合华北克拉通岩石圈地幔的研究成果，从下地壳的视角为更深刻全面的理解华北岩石圈的破坏提供更多的岩石学和地球化学制约。此外，项目尝试将非传统稳定同位素如Li、Fe、Mg等应用到下地壳岩石的研究中，揭示这些同位素在下地壳岩石的组成特征，填补我国在这方面研究的空白。

This project will focus on the comparative studies of the lower crust underneath the North China craton, which was decratonized during the Phanerzoic. Compresensive mineralogical, petrological as well as geochemical investigations will be carried out on the outcropped granulite facies terrains and granulite xenoliths entrained in the Paleozoic kimberlites, both are representatives of the lower crust prior to the decratonization, and granulite and pyroxenite xenoliths enclosed in the Meso-and Cenozoic igneous rocks, representing the lower crust during the decratonization process. The results will help to reveal the modification of the the age, thickness and composition of the lower crust during the lithospheric destruction, the mechanisim induced the modificaion, the way, the episodes, and the spatial diversity of the modification will also be discussed. Overall, the studies will provide more petrologcial and geochmical constrains on understanding the lithospheric destruction of the North China craton, particularly from a lower crust perspective. In additon, application of non-traditional stable isotopes such as Li, Fe Mg in the lower crust rocks will also be tried, with aims to reveal the compositional characteristics of these isotopes in the lower crust.