粒度与岩石流变相关性研究进展

粒度对岩石的粘度、应变率和流变机制及转换具有重要的影响。在相同条件下,粒度越大,粘度越高。在粒度灵敏性变形中,粒度的变化有时对岩石应变率的影响也是显著的。大部分天然岩石是由不同粒度的矿物颗粒组成,不同粒度的颗粒在变形中可能受不同的变形机制控制,包含粒度分布参数的复合流动律改进了人们对天然岩石流变性的认识。岩石的变形过程同时也是粒度的不断修正过程,粒度的演化具有稳态化的趋势。

Advance of the Relationship Between Grian Size and Rock Rheology

Grain size has an important effects on rock rheology,which include viscosity,strain rate,deformation mechanisms and their transition.In the same condition,the bigger grains have higer viscousness than the others.The variation of grain size sometimes has an obvious effect on the strain rate during grain size-sensitive deformation.A majority of nature rocks are composed of minerals with different sizes,and the minerals may be controlled by different deformation mechanisms owe to their different sizes,so composite flow laws including the parameters describing grain size distribution have been changing pepople's overview on rheology of nature rocks.The rock grain sizes are continuously changing during deformation.and evolve towards stable state.