中部地壳韧性剪切带是一个特殊构造层次，该深度域内岩石具有脆-韧性转变的特征，各矿物不同变形机制组合对岩石力学属性变化具有显著的影响。本项目基于花岗岩在高温高压条件下的变形伴随的流体和岩石相互作用与韧性剪切带形成机制这一科学问题，系统开展花岗岩剪切变形高温高压实验，模拟在剪切变形作用下，花岗岩向糜棱岩转变过程以及韧性剪切变形叠加脆性破裂过程，通过精细分析岩石中主要矿物塑性变形机制以及实验变形样品的水含量和化学成分，剖析剪切变形、流体与矿物成分变化的关系，揭示剪切变形过程中的力学-化学作用，探讨韧性剪切带的发生、发展和演化过程中不同矿物变形机制的复杂性以及流体在韧性剪切带起的作用，为韧性剪切带的流变行为、化学行为和剪切作用过程提供实验数据。

The ductile shear zone is of particular importantance in studying deformation on the middle crust, where brittle-ductile transition of rocks resulting different deformation mechanisms of minerals. Based on the scientific questions of the interaction between fluid and rock during shear deformation of granite under high temperature and pressure, and the formation mechanism of ductile shear zone, this project plans to conduct the shear deformation experiments using fine-grained granite under high temperature and high pressure conditions. The purpose of the experiments is simulating the transformation process from granite to mylonite, and brittle facture behaviors which is superimposed on earlier ductile shear deformation. We will perform high resolution analysis of the water content, chemical composition and the plastic deformation mechanism of the major minerals in the experimental deformed samples. Based on these works, we try to figure out the relationship between shear deformation with fluid as well as chemical composition changes for minerals, and reveal the mechanical-chemical effects during shear deformation. The significant scientific issues in this study lie on two points: (1) confirm the complexity deformation mechanisms for different minerals as well as the role of fluids in occurrence, developing and evolution of ductile shear zones; (2) provide the basic experimental data for further study of the rheological behavior, chemical composition, shearing process of the ductile shear zone.