摘要
基于黄陵穹隆周缘早古生代各纪地层典型剖面的再研究,重新厘定区内若干年代地层和岩石地层单位及其界线标志。根据层序界面的识别,结合沉积相和生物群特点分析,指出长江三峡地区早古生代时期大致可识别出3个中层序（SME1,SME2和SME3）,6个层序组（SSA1,SSA2,SSA3,SSA4,SSA5和SSA6）和21个层序或T—R旋回（海进-海退旋回）。此外,基于华南板块早古生代生物古地理演变特征的分析,初步讨论了华南板块古地理演变与海平面变化的关系,指出中层序海平面变化旋回和华南板块与相邻板块的聚裂及其漂移紧密相关。
Based on the restudy of the Paleozoic sections around Huangling Dome, some chronostrati-graphical units and lithological units are redefined in this paper. According to the identification of the sequence boundaries and the analysing results of biota and sedimentary facies on the Early Paleozoic stratigraphies, three mesosequences (SME1, SME2 and SME3), six sequence assemblages (SSA1, SSA2, SSA3, SSA4, SSA5, SSA6), and twenty-one sequences at least or T-R cycles (transgression-regression cycle) can be recognized in the Yangtze Gorges area. Additionally, the relationships between the palaeogeographical evolutions and sea level changes were preliminary discussed based on the analysis of the characteristics of the palaeobiogeographical evolution in Early Paleozoic of the Huanan Platform.
出处
《华南地质与矿产》
CAS
1999年第3期1-11,共11页
Geology and Mineral Resources of South China
基金
地质矿产部科技司前缘科技研究计划项目
地调局科技专项"长江三峡地区地质遗迹保护研究"(地科专97-5)
关键词
长江三峡地区
早古生代
多重地层划分
multiple stratigraphical subdivision sea level change Early Paleozoic Yangtze Gorges
