本项申请拟选择南阿尔金-柴北缘早古生代碰撞造山带为典型研究地区，以与变质作用相伴随的深熔作用为主要研究对象，通过详细的野外构造剖面穿切和关键地段的大比例尺填图，识别不同期次熔体的分布范围、规模、变形特征，以及熔体与高级变质岩之间的关系。并重点查明（1）多重深熔作用的显微结构证据和（2）深熔岩石的显微变形行为和变形机制及不同应变条件下组构特征的变化规律。在此基础上，结合相平衡模拟计算和实验模拟研究，限定变质作用及深熔作用的温度和压力条件和熔体成分，反演深熔作用的形成热力学机制。并力图在上述研究的基础上，探讨多重深熔作用的成因机制，建立碰撞造山过程中变质作用、变形作用和深熔作用的时空关系，最终为超高压变质岩的折返机制研究提供重要理论依据和数据支撑。

On the basis of structural profile and large-scale mapping, this project focuses on anatexis and metamorphism in the North Qaidam and South Altyn area, which will provide insight into the distribution, deformation features of the anatectic melt and relationship between melt and high-grade metamorphic rocks. This project will also concentrate on (1) unequivocal microtextural evidence for partial melting (2) deformation behavior and mechanism and fabric characteristics under different strain condition in thin section. On the bases of above task, Phase equilibria and experimental modeling will be carried out for metamorphic rocks and melts, which will provide constraints on P-T conditions and composition of partial melting and metamorphism. On the basis of above-mentioned research, the project will finally play a significant role in the study of relationship between metamorphism, deformation and anatexis, and exhumation of deep subductional continental crust.