Deformation and processes of physical evolution of sediments in 2-3 km burial depth at subduction zone

通过对埋藏深度仅为2-4公里的陆上增生杂岩的研究，分析了俯冲带无地震-地震过渡带(海底以下2-4公里)内蒙皂石向伊利石变形样式的变化及相关的转变。这种与粘土矿物转变和孔隙度降低相关的应变硬化是滑脱和/或混杂岩带增厚的主要机制，代表了在进入孕震带之前沉积物性质的基本机械/化学变化。

Change in deformation styles and the related transition from smectite to illite within the aseismic-seismic transition zone (2-4 km below the seafloor) in a subduction zone were analyzed by studying an onland accretionary complex that was previously buried to a depth of just 2-4 km. Such strain hardening associated with the clay mineral transition and decrease in porosity is the primary mechanism of thickening of the decollement and/or melange zone, and represents a fundamental mechanical/chemical change in the properties of sediments immediately before entering the seismogenic zone.