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在温度为８００～９００℃，围压为１ＧＰａ的条件下对基性麻粒岩进行了压缩变形实验。样品变形处于半脆性域，以出现非破裂的准韧性剪切带为特征。提出了剪切带是由样品的原始缺陷向外稳态扩展而形成的机制，可用稍加改变的流变介质断裂力学原理对这种扩展过程进行说明；并将此机制推广到剪切带的形成中。
Under the condition of temperature of 800-900 ℃ and confining pressure of 1GPa, the compressive deformation experiment of basic granulite was carried out. The sample deformation is in the semi-brittle domain, characterized by the presence of non-fractured quasi-ductile shear bands. It is proposed that the shear band is a mechanism formed by outward expansion of the original defect of the sample. This expansion process can be explained by the slightly modified rheological fracture mechanics theory. The mechanism is extended to the shear band Formed.