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榆树沟麻粒岩相构造岩宏观上呈糜棱岩带和糜棱岩化带产出，发育强烈流变叶理；微观上主要造岩矿物发育各种塑性变形显微构造。变形过程中同种造岩矿物的动态重结晶新晶与塑变残斑（残晶） 之间化学成分变化不明显， 表明在变形期间水活度低，以位错蠕变为主。该构造岩形成于深地壳麻粒岩相变质的晚期阶段，是地体在早期阶段于下地壳底部－上地幔顶部发生高压麻粒岩相变质作用后因构造抬升进入深地壳麻粒岩相环境下发生退变质和强烈韧性剪切变形的产物， 其形成后经历了快速的构造折返过程。
The Yushu Gulch granulite facies rocks are macroscopically mylonitized and mylonitized with strong rheological leaf foliage. Microstructurally, the major rock-forming minerals develop various plastic deformation microstructures. During the deformation process, the chemical composition changes between the dynamic recrystallization of the same type of rock-forming minerals and the plastic deformation remnant (residual crystal) are insignificant, indicating that the water activity is low and the dislocation creep prevails during the deformation. The tectonic rocks formed in late stage of granulite facies metamorphism in deep crust, which is caused by the tectonic uplifting into the deep crust granulite facies after the high-pressure granulite facies metamorphism occurred at the bottom of the lower crust at the top of the lower crust Underwent metamorphism and strong ductile shear deformation of the product, after its formation experienced rapid structural reentry process.