摘要
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。
Huaxi is located the transitional belt from carbonate platform to deep-water basin,which is an ideal area to study the sequence-stratigraphic framework of a continental margin.Three facies are recognized in this area： carbonate platform,platform margin,and basin facies.Based on sequence stratigraphy theory,this paper details the characteristics of sequence boundary surfaces which included uncomformity surfaces,lithologic character and facies change surfaces,karst surfaces and errosion surfaces.The Lower to Middle Triassic in the Huaxi area is divided into five type Ⅰ sedimentary sequences and one typeⅡ sedimentary sequence according to the stratigraphic structure,sequence features and sedimentary facies.The migration of carbonate breccia also reflects relative sea level changes.Through the research of sedimentary facies changes and low-wedges migration,we discussed the relative sea level change in the Huaxi area.The research area has experienced a complete second-order sea-level cycle from the Early to Middle Triassic.Sea level change in the Huaxi area is consistent with the global sea-level change during the Early Triassic,but showed a regional particularity in the Middle Triassic.
出处
《地层学杂志》
CSCD
北大核心
2011年第4期397-403,共7页
Journal of Stratigraphy
基金
国家自然科学基金(No.41002007)
贵州省"早三叠世遗迹化石及其对P-T事件后生物复苏的启示"(41002007)资助
