柴达木盆地北缘晚白垩世古构造活动的特征研究

The study of Late Cretaceous paleostructural characteristics in northern Qaidam Basin

柴达木盆地北缘晚白垩世构造活动控制了现今中生代残余层序的分布。在分析中生代地层分布特征的基础上,通过对红山凹陷下白垩统的地层尖灭关系讨论、马海凸起中生代地层的剥蚀厚度变化分析和苏干湖凹陷晚白垩世形成的古断裂带结构研究,提出柴达木盆地北缘晚白垩世古构造活动形成了北西走向的构造带,古构造以断块差异隆升为特点。现今新生代层序和下伏层序的复杂接触关系主要是由该期构造运动决定的。

The distribution of Mesozoic remainder sequences and the formation of paleostructures were controlled by Irate Cretaceous deformational events. Based on the study of the distribution and interfaces of Mesozoic and Cenozoic sequences, we discuss the relation of Lower Cretaceous thinning in the Hongshan depression, the distribution characteristic of Mesozoic remainder thickness in Mahai Rise, and the configuration of paleo-fault zones formed in the Sugan Lake Depression during the Late Cretaceous, We suggest that the northwest-trending structural zone in northern Qaidam Basin was formed during Late Cretaceous deformation and that the characteristic feature of this deformation was differential block uplifting, This Late Cretaceous deformation determined the complicated contact relationships of Cenozoic and Early-Cenozoic sequences.