阿拉伯地盾主要是由晚元古宙火山-沉积岩系组成,岩系为大规模同时代的花岗岩类岩基和深成岩所侵入。这些岩石保存很完整,基本上能提供该区从9亿年以前至寒武纪阶段地壳演化的连续记录,成为解决阿拉伯地壳演化过程中古环境的一个关键。该火山—沉积岩系与现代岛弧岩系的相似性首先被Jackaman所注意到,然后他以Green—wood等人提出的地壳演化模式为基础,认为地盾南部的成因可看作是由早期拉斑玄武 The Arabian shield consists mainly of Late Proterozoic volcanic-sedimentary rocks that intrude into large-scale, contemporaneous granitic basement and plutons. The preservation of these rocks is complete and basically provides a continuous record of the crustal evolution from 900 million years ago to the Cambrian stage in the area and is the key to solving the paleoenvironment during the evolution of the Arab crust. The similarity between the volcanic-sedimentary series and the modern island arc series was first noticed by Jackaman. Based on the crustal evolution model proposed by Green-wood et al., The author thinks that the origin of the southern shield can be regarded as a " Spot basalt