前言软流层中出现的大规模固态流动现象,在俯冲板块边界的下地壳和上地幔中也一定存在。这是因为,在那里两个板块的相对位移不但速度较快,而且持续的时间也很长。大规模的地壳和上地幔的固态流动,在地质历史时期中,不仅使温度和压力等条件有所改变,而且使具有不同化学成分的岩石之间的相对位移也发生了很大的变化。因此,可以说,矿物之间 Preface Large-scale solid-state flows that occur in the asthenosphere must also exist in the lower and upper mantle beneath the subducting plate boundaries. This is because, where the relative displacement of the two plates is not only faster, but also for a long time. Large-scale solid-state flows of the crust and the upper mantle not only changed the conditions of temperature and pressure during the geological history, but also greatly changed the relative displacements of rocks with different chemical compositions. Therefore, it can be said that between minerals