粒度对橄榄石流变性质的影响

Effects of the grain size on the rheology of olivine

依据已有的高温高压流变实验数据,计算了橄榄石流变律的基本参数,并得到了蠕变机制转换的粒度范围.初步探讨了上地幔150km深度处的主要蠕变机制,并得到了相应参数下的应变率-应力-粒度机制图.

Using the previous experimental data at high pressure and high temperature,the main parameters of rheological law for olivine were discussed.The grain size range for the rheological change were determined by the theoretical discriminant.The main rheological mechanism and the viscosity in the 150 kilometers’ depth were preliminarily discussed,and a deformation map of strain rate-stress-grain size under certain conditions was obtained.