三塘湖盆地中、上三叠统划分及分布

目的明确三塘湖盆地中、上三叠统小泉沟群在盆地内部各凹陷的分布及地层划分和时代归属等问题。方法依据新获得的较为丰富的动、植物及孢粉化石资料,综合归纳前人研究成果进行充分讨论及对比。结果中、晚三叠世,马朗—方方梁—苇北地区呈隆起状态,遭受风化剥蚀,故马朗凹陷缺失中、上三叠统,盆地西北部的汉水泉凹陷、条湖凹陷和东南部的淖毛湖凹陷为湖泊,接受了中、上三叠统沉积。结论三塘湖盆地由于受晚海西构造运动的影响,致使盆地整体抬升并褶皱,未接受上二叠统和下三叠统沉积。

The Middle-late Triassic subdivision and distribution of Santanghu Basin

Aim To define the distribution and partition of the Xiaoquangou group of middle-upper Triassic subdivision and distribution of Santanghu Basin,Xinjiang.Methods According to the new-attained abundant bioassemblages and sporopollen assemblages of several boring wells,make an argumentation to this question adequately by combining with previous research works.Results The area of Malang-Fangfangliang-Weibei were exposed to weathering and erosion as a result of the lifting of the basin in Middle-Triassic.So there were no sedimentation of Middle-late Triassic in Malang Depression,whereas Hanshuiquan Depression,Tiaohu depression in northwest of basin and Naomaohu depression in southeast of basin had received the lake sedimentation of Middle-late Triassic.Conclusion Because of influence of late-Hercynian orogeny,the whole basin lifted and folded in large-scale,without deposition of upper Permian and lower Triassic.