六盘山盆地中–新生代构造样式及盆地演化

The Meso-Cenozoic Structural Style and Basin Evolution in the Liupanshan Basin

为明确六盘山盆地中–新生代构造样式和盆地演化,利用大量二维地震和露头资料,开展了构造样式解析,划分了构造演化阶段,探讨了中生代以来盆地演化过程。研究结果表明,六盘山盆地发育走滑–挤压、挤压、反转、伸展四大类构造样式,不同构造样式形成时间、发育区带不同;六盘山盆地自中生代以来经历了三叠纪至早–中侏罗世统一古鄂尔多斯盆地、晚侏罗世大规模挤压逆冲、早白垩世伸展断陷、晚白垩世至古新世整体抬升、始新世整体沉降、新近纪末期走滑挤压改造六个演化阶段。

To clarify the Meso-Cenozoic structural style and basin evolution of the Liupanshan Basin, based on a large number of 2D seismic and outcrop data, the structural style was deeply analyzed and the basin evolution since Mesozoic was discussed. The results show that it has developed strike- slip extrusion, extrusion, inversion and extension structural styles in the Liupanshan Basin. Dif-ferent structural styles have different formation times and development zones. Since Mesozoic, Liupanshan Basin has experienced six evolution periods, namely, western margin of the Unified Ordos Basin from Triassic to early-mid Jurassic, large-scale extrusion in late Jurassic, Extensional Faulted Depression in early Cretaceous, integral uplift denudation from late Cretaceous to paleocene, another integral sedimentation in Eocene and strike-slip extrusion in Late Neogene.