海南岛中部古生代沉积盆地格局及其演化特征

The Framework and Evolution Characteristics of Paleozoic Depositional Basin in Central Hainan Island

海南岛中部古生代盆地经历了多阶段、多旋回的演化发展,总体处于一个SN向伸展的区域性构造环境中,地壳由南至北发生裂解,形成了近EW向的早、晚古生代海盆。早古生代海盆自寒武纪地壳的裂解至志留纪的闭合,表现出多阶段或多幕次的早张晚压的环境背景中,地壳以差异升降运动为特点,并最终在志留纪末隆起为陆,缺失上、中泥盆统的沉积。晚古生代盆地具有盆地西浅东深的格局,经历了由西至东的剪刀式消减闭合过程,岩浆作用从西到东呈现出由老至新的演化,并形成了略向南面突出的EW向弧形展布的花岗岩带和构造带。

The Paleozoic basin in central Hainan Island had a staged polycyclic evolutionary process, and was in a meridional extensional regional structure environment. The meridional splitting of crust formed the early Paleozoic era and late Paleozoic era sea basin. The early Paleozoic era sea basin was in an environment that extending early and expressing later, and the crust rose above sea surface at the end of Silurian. The deposit of upper - middle Devonian was lacking. The late Paleozoic era basin was depth in east more than in west and the magmatism in east was younger than in west. The granite belt and tectonic belt formed by magmatism was distributioned as a latitudinal curve.