This paper deals with compositional variations in fault zones from a dynamic point of view.In the fault zonen consisting of silicates, relative accumulation of Si and Fe is noticed in re-sponse to the leaching-out of K, Na, and to a lesser extent, Mg, Ca and Al. Tbe ordee of pe-trogenetic elements from stable to mobile is tentatively suggested as follows: Si→Fe→Mg→Ca→Al→K→Na. The difference in ionic radius for these chemical elements is thought to be themajor factor controlling dynamic differentiation. In the fault zones arc silicates on one side andcarbonates on the other, and new minerals are recognized in tectonites. On the silicate side Caand Mg increase but Si and Al decrease; and the opposite is true on the carbonate side. Thisphenomenon indicates that migration of elements in the fault zones is accelerated by dyna miceffect. This paper deals with compositional variations in fault zones from a dynamic point of view. In the fault zonen consisting of silicates, relative accumulation of Si and Fe is noticed in re-sponse to the leaching-out of K, Na, and to a lesser extent, Mg, Ca and Al. Tbe ordee of pe-trogenetic elements from stable to mobile is tentatively suggested as follows: Si → Fe → Mg → Ca → Al → K → Na. The difference in ionic radius for these chemical elements is thought In the fault zones arc silicates on one side and carbonates on the other, and new minerals are recognized in tectonites. On the silicate side Ca and Mg increase but Si and Al decrease; and the opposite is true on the Thisphenomenon indicates that migration of elements in the fault zones is accelerated by dyna miceffect.