华南青白口纪-三叠纪构造-地层区划及特征

The Division of Qingbaikouan-Triassic Tectono-Stratigraphic Regions and Their Characteristics in South China

构造-地层区划是一项具有全局性和战略性的工作,是地质学和地球科学所涉及各领域调查研究的“骨架”。本文针对华南新元古代青白口纪—中生代三叠纪地层发育特征,提出华南该时段构造-地层一至三级综合区划方案。区划的原则是找出各单元独特的、明显区别于相邻单元的构造-岩石建造特征。区划工作主要以大地构造背景和演化历程、洋陆重建与分布、深部构造及结构、构造隆升与坳陷、地层序列和结构、沉积相序等为依据,划分出3个一级单元、6个二级单元和44个三级单元。通过一至三级区划,揭示出青白口纪—三叠纪期间华南原型盆地成生与地层充填序列、控制盆地发育的大地构造环境均与周缘洋盆的演化和洋陆转换过程密切相关。

The tectono-stratigraphic regionalization is a global and strategic work,also the“skeleton”of investigation and research in all fields of geology and earth science.An integrated regionalization scheme of the first to third levels of tectono-stratigraphy in South China is proposed in accordance with the development characteristics of Qingbaikouan-Triassic strata.The principle of regionalization is to find out the unique tectono-stratigraphic characteristics of each unit distinguishing from adjacent units.South China tectono-stratigraphic regions are divided into 3 first-level units,6 second-level units and 44 third-level units according to the tectonic setting and evolutionary history,ocean-continental reconstruction distribution,deep tectonics and structures,tectonic uplift and depression,stratigraphic sequence and structure,sedimentary facies sequence,and so on.Then it is revealed that the formation and stratigraphic filling sequence of the prototype basin in South China and the tectonic environment controlling the development of the basins are closely related to the evolution of peripheral ocean basins and the ocean-continental transition.