柴北缘构造活动及其磷灰石裂变径迹记录  

Tectonic Activities and Apatite Fission-track Records in the Northern Margin of Qaidam Basin

作　　者：曾春林[1] 姜波[1] 张敏[2] 尹成明[2] 王超勇[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]青海油田分公司勘探开发研究院,甘肃敦煌736202

出　　处：《石油天然气学报》2009年第2期20-24,共5页Journal of Oil and Gas Technology

基　　金：国家油气重大专项项目(XQ-2004-01)

摘　　要：根据野外典型构造变形观测和主干地震测线解释与分析,将柴北缘构造演化划分为早-中侏罗世的断坳盆地、晚侏罗世-白垩纪的坳陷盆地、白垩纪末期的反转挤压抬升剥蚀、古近纪坳陷盆地和新近纪挤压坳陷盆地5个阶段。柴北缘侏罗系主要是在造山期后的伸展作用及自身的沉积载荷下沉积的,其构造的复杂性主要是后期构造旋回叠加和改造的结果。受构造活动的控制,柴北缘侏罗系沉积中心具有由南西向北东迁移且沉积范围不断萎缩的特点。磷灰石裂变径迹测试显示,表观年龄(85±12)～(78±9)Ma、(34±9)Ma和2.9～1.1Ma,分别与燕山末期、喜马拉雅中、晚期挤压抬升构造活动相对应,为盆地构造演化分析提供了有力佐证。Based on the analysis of structural deformation and seismic sections, tectonic evolution of Mesozoic and Cenozoic was divided into 5 stages: such as fault-depression stage in early-middle Jurassic; depression stage in late Jurassic-Cretaceous; uplift-erosion stage in late Cretaceous; depression stage in Paleogene; squeezed sag in Neogene. Controlled by the extension and postorogenic phase and self sedimentary loading, the Jurassic was formed, but the complexity of structure was the result of later activities and reformation. The deposition center was transferred from SW to NE controlled by structural activities. Results of apatite fission-track shows that apparent ages are 85±12Ma^78±9Ma, 34±9Ma and 2.9~1.1Ma, which are corresponding to the late Yanshan stage and middle-late Himalayan stage. The test proves an evidence to the analysis of tectonic evolution.

关 键 词：柴达木盆地 构造演化 沉积 磷灰石 裂变径迹 油气 

分 类 号：P618.13[天文地球—矿床学]