近年来研究表明中-新太古代时期是早期大陆地壳形成和演化的重要转折阶段，花岗岩类岩浆作用的多样化是这一时期陆壳性质和热构造体制转变的标志性记录。本项目拟选择辽东-胶北地区~2.9-2.7Ga闪长质-TTG片麻岩和富钾质花岗岩两个系列花岗岩类岩石为研究对象，通过全岩主微量元素和Sm-Nd-Mg同位素、锆石U-Pb-Lu-Hf-O同位素和微量元素研究，解剖不同系列花岗岩类岩石组合的时空分布、源区性质、成因机制和相关的热-动力学过程，定量分析它们记录的壳幔作用过程，包括初生地壳生长、古老陆壳活化和再循环。结合区域相关研究进展，总结~2.9-2.7Ga壳幔作用演化历史和典型特征，探讨中-新太古代花岗岩类岩浆作用多样化产生机制和壳幔动力学过程，深入探索中-新太古代热构造体制转折机制及其在早期大陆地壳形成演化中的意义。

Recent studies reveal that fundamental changes of early continental crust formation and evolution occurred globally during the Meso- to Neoarchean period. Particularly, the diversification of granitoid magmatism is one of the major characteristics accompanying the compositional change of continental crust and transition of geodynamic regimes during this period. In this proposal, systematic whole-rock major and trace elements and Sm-Nd-Mg isotopes, together with zircon U-Pb-Lu-Hf-O isotopes and trace elements, will be analyzed for the ~2.9-2.7 Ga dioritic-TTG gneisses and potassium-rich granitoids in the Eastern Liaoning and Jiaobei Provinces, North China Craton. These data will be integrated to (1) investigate the spatial and temporal distribution, source characteristics, petrogenesis, and thermal dynamic processes of different granitoid rock associations; and (2) quantitatively analyze the crust-mantle interaction processes, including juvenile crustal growth, and reworking and recycling of ancient crustal materials. Combined with regional research progresses, the ~2.9-2.7 Ga crust-mantle evolution history and their major features will be summarized. Accordingly, we plan to discuss the specific mechanism and crust-mantle geodynamic processes responsible for the Meso- to Neoarchean diversification of granitoid magmatism, and explore the transformation mechanism of global Meso- to Neoarchean geodynamics and their implications for the formation and evolution of early continental crust.