摘要
柴达木盆地中新生代沉降拗陷的原型盆地类型为压陷型沉降盆地。中生代到古近纪(古新世和始新世)盆地西部以分隔性断块发育为特征,北缘则主要为沉降拗陷群。中新世以来的喜马拉雅中晚期构造运动,使青藏地块受到强烈的水平挤压,地壳因发生大规模褶皱变形和冲断推覆而大大加厚并迅速隆升。地处青藏地块边缘的柴达木盆地受其碰撞应力效应十分明显,在构造动力机制转换的作用下,盆地西部前中生代基底持续抬升,沉积、沉降中心发生了自西向东的迁移,发育形成了以三湖凹陷为沉降中心的压陷型沉降盆地。
Based on the geological and geophysical datum, we considered that the Menozoic-Cenozoic basin-prototype of Chaidamu basin was the down-warped settling basin. From Menozoic era to early Cenozoic era(E_(1)and E_(2)) the separate fault block was very evident in west of the basin ,but in north there were a lot of setting basins. During the middle-later Ximalaya tectonic movement the Qinghai-Tibet plot pressed severely and thickened greatly the earth crust because of the deformation and overlapping. Because of the dynamic transformation the applied force made the basement of the basin to rise gradually and the center of the sediment and settlement moved from the west to the southeast, which formed the down-warped settling basin which deposit center was Sanhu depression.
出处
《天然气地球科学》
EI
CAS
CSCD
2004年第4期395-400,共6页
Natural Gas Geoscience
基金
中国科学院资环局知识创新重要方向项目(编号:KZCX3-SW-128)资助.
关键词
柴达木盆地
压陷型拗陷
构造动力机制转换
Chaidamu basin
Down-warped settling basin
Dynamic transformation.
