熔体的形成受到地温梯度、压力和流体等多种因素的制约。在部分熔融过程中，岩体的形态仅发生微小变化，但随着熔体比例的增大，岩石的变形方式和变形机制将发生较大变化：变形方式由水力破碎转变成为熔体强化的韧性变形；变形机制由位错蠕变转变成为扩散蠕变。此外，下地壳熔体能长期存在并大幅度地调节应变，起到润滑层的作用。 Melt formation is affected by many factors such as geothermal gradient, pressure and fluid. In the partial melting process, the rock morphology changes only slightly, but as the melt ratio increases, the rock deformation and deformation mechanism will change greatly: the deformation mode changes from hydraulic crushing to melt-enhanced ductility Deformation; deformation mechanism from dislocation creep into diffusion creep. In addition, the lower crust melt can exist for a long time and greatly adjust the strain, play the role of lubricating layer.