鄂西北房县盆地的形成与演化

Formation and Evolution of Fangxian Basin in Northwestern Hubei

房县盆地整体地形南陡北缓,古近系广泛发育,前第四纪地层向南倾斜。其南部边界的青峰断裂带在古近纪正断作用明显,北东向白鹤断裂的正断和北西向安康-房县断裂的左旋控制青峰断裂的范围和盆地的东西边界。房县盆地是典型的半地堑断陷盆地,经历了拉张-挤压-差异升降的过程,现今仍发育温泉群,时有中等地震发生。

Fangxian basin is steep in the south and gentle in the north, where Paleogenestrata devel- oped well and pre-Quaternary strata tilts to the south. The normal faulting of Qingfeng fault zone, which is the south boundary of this basin, is obvious in Paleogene. Normal faulting of the NE trending Baihe fault and sinistral faulting of the NW trending Ankang-Fangxian fault control the extent of the Qingfeng fault and the EW boundary of this basin. Fangxian basin, which has undergone tension, compression and diverse settlement is a typical half-graben rifted basin. The hot spring groups are still developing, and moderate earthquake activity occurs in the basin.