右江盆地晚古生代深水相地层沉积构造演化

Sedimentary and tectonic evolution of Late Paleozoic deep-water strata in the Youjiang basin

在对测自桂西地区的田林八渡、那坡坡荷、百色平圩、阳圩等地晚古生代的深水相沉积地层的沉积特征、玄武岩地球化学分析以及重要的构造地质事件研究的基础上．对右江盆地晚古生代盆地沉积演化做了阐述,提出了右江盆地自早泥盆世晚期开始出现大陆边缘裂离,先后经历了裂谷盆地形成阶段(早泥盆世晚期-中三叠世早期)、洋壳盆地形成阶段(晚泥盆世-早石炭世)、洋壳盆地强烈扩张阶段(晚石炭世-中二叠世)、洋壳盆地收缩阶段(晚二叠世-中三叠世早期)-洋盆封闭快速充填阶段(中三叠世晚期)的完整沉积盆地演化序列。

The sedimentary evolution of the Late Paleozoic Youjiang basin is dealt with on the basis of the study of the sedimentary characteristics of the Late Paleozoic deep-water sedimentary strata, basalt geochemistry and important tectonic events of the sections at Badu of Tianlin, Pohe of Napo and Pingxu and Yangyu of Baise. The authors suggest that after the continental-margin rifting and separation in the late Early Devonian, the Youjiang basin underwent a complete evolutionary sequence from the formation stage of a rift basin （late Early-early Late Devonian）, formation stage of an oceanic basin （Late Devonian-Early Carboniferous）, strong spreading stage of the oceanic basin （Late Carboniferous-Middle Permian）, contraction stage of the oceanic basin （Late Permianearly Middle Triassic）, closing and rapid filling stage of the oceanic basin （late Middle Triassic）.