地质作用的演化和旋回性地质旋回和大旋回前寒武纪的周期是以地质发展的自然阶段为基础划分的,换句话说,每一个大的地质旋回是由相对构造静止持续期和其后续的几个较短的变动期组成。第一阶段以地壳下降运动为主,伴有碎裂和拉伸,在坳陷中形成沉积堆积层,同时在很多地方发生熔岩喷发和伴生的同源岩浆侵入体。在某些海退最末期出现被逐渐增大的海侵所代替,结果形成 Evolution and Cyclization of Geological Processes Geological Cycles and Great Cycles The Precambrian cycles are based on the natural stages of geological development. In other words, each large geologic cycle is defined by the relative duration of the tectonic continuation and its successor The composition of several short changes. The first stage is dominated by crustal descending movement accompanied by fragmentation and extension, forming sedimentary deposits in the depression and lava eruptions and associated intrusive magma intrusions in many places. The result of the gradual emergence of some transgressions by the sea in the late stages of some recessions has been replaced