酒泉盆地中、新生代构造演化及沉积充填特征

酒泉盆地晚中生代处于伸展裂开环境，新生代处于挤压聚敛环境，它是经历了早白垩世伸展断陷期和第三纪挤压增陷期两期构造旋回，即早白垩世断陷盆地演化阶段和新生代前陆盆地演化阶段，中，新生界沉积盖层具断坳叠竖的双层结构。酒泉盆地在早白垩世经历了箕头断陷形成期，凹陷扩展期，碟状坳陷3个主要演化阶段，新近纪以来强烈的逆冲推覆作用以及剪切作用肢解，改造了晚中生代断陷盆地，图2参7

Structure evolution and sedimentary filling of Jiuquan Basin in Mesozoic-Cenozoic period, NW China

Jiuquan Basin has experienced two major tectonic cycles that are stages of the expanding rifting in the Early Cretaceous and the compressing depression in Tertiary, which means the basin was developed by the evolution phase of rifted basin in the early Cretaceous and the evolution phase of the foreland basin in Cenozoic. From the Middle to Late Mesozoic Period, jiuquan Basin was in the expanding and splitting environment, however, the basin was in the compression and convergent environment in Cenozoic period. Therefore, the sedimentary cap formations have bilayer structure of superposed sag and depression from Mesozoic to Cenozoic. In the Early Cretaceous, Jiuquan Basin experienced three evolution stages, which are the halfgraben-like depression, the expanding depression and the dished depression. From Late Tertiary, the Late Mesozoic rift-subsidence basin has been dismembered and transformed by the fierce thrusting and shearing action.