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早、中三叠世时贵阳花溪地区可以划分为3个沉积相区:台地相区、台缘相区和盆地相区。在对不同相带内典型剖面详细观察和层序界面识别基础上,在下、中三叠统中划分出4个Ⅰ型沉积层序和1个Ⅱ型层序。通过研究剖面纵向的沉积相变和横向低位岩楔的位置迁移,认为研究区在早—中三叠世经历了一个完整的二级海平面升降旋回,早三叠世与全球海平面变化基本一致,呈上升趋势;中三叠世由于构造作用,海平面总体呈下降趋势,表现出区域特殊性。
In the early and middle Triassic, Huaxi area of Guiyang can be divided into three sedimentary facies: platform facies, platform facies and basin facies. On the basis of detailed observation of typical sections and identification of sequence boundaries in different facies belts, four type Ⅰ sedimentary sequences and one type Ⅱ sequence are divided into the Lower Triassic and the Middle Triassic. By studying the sedimentary facies change in vertical section and the lateral migration of lateral low wedge wedge, we believe that the study area experienced a complete second-order sea-level rise-and-fall cycle in early-Middle Triassic. The changes of the Early Triassic and the global sea level basically coincide , Showing an upward trend. Due to the tectonic role of Middle Triassic, sea level generally showed a downward trend, showing regional specialties.