燕山构造带滦平早白垩世盆地沉积过程和演化  

Depositional process and evolution of Luanping Early Cretaceous basin in the Yanshan structural belt.

作　　者：张英利[1] 渠洪杰[2] 孟庆任[2] 

机构地区：[1]西安石油大学油气资源学院,西安710065 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《岩石学报》2007年第3期667-678,共12页Acta Petrologica Sinica

基　　金：中国科学院知识创新工程项目(KZCS1-07-3)

摘　　要：滦平盆地是燕山构造带内一个具有代表性的早白垩世伸展盆地。对盆地内沉积岩相和相组合的详细分析结果显示,盆地内部发育不同的沉积相带并显示明显的空间变化。盆地北部和西部边缘以冲积扇砾岩和扇三角洲砂岩、砾岩沉积为主,盆地中心为湖泊细粒沉积。河流相砂岩和砾岩主要分布于盆地的东南部。古流向和物源恢复结果证明,盆地沉积物主体来自于北部和西部老变质岩基底,仅少部分沉积物来自盆地的东南缘。盆地构造沉降和沉积充填过程主要受北缘和西缘张性断层的控制,断层下盘基底岩石的抬升与盆地边界正断层活动相关,从而成为盆地主要的物源区。滦平盆地的演化可划分为三个阶段:即早期火山喷发阶段、中期强烈断陷阶段和晚期填平阶段。滦平盆地代表了早白垩世燕山构造带其它同类盆地的发展过程,它们皆以小型独立的盆地发育为特征。The Luanping basin is a well-preserved extensional basin in the Yanshan structural belt. There exist various depositional sedimentary lithofacies that show obvious spatial variations. Alluvial fan and fan delta dominated proximal areas of the northern and western basin margins, while fine-grained lacustrine sediments were prevalent in the basin centre. In southeast basin is mostly fluvial sandstone and conglomerate facies associations. Sediments were demonstrated to have mainly come from metamorphic basements on the north and west, only small proportion from southeastern margin, as indicated by restored paleo-current directions and provenance. Tectonic subsidence and deposition sedimentation were primarily controlled by the northern and western basin border faults. Uplift of basement rocks of the footwall was due to the tilting of border faults and became main provenance areas. Sedimentary evolution of Luanping basin can be divided into three stages. The first stage is featured by vigorous volcanic eruptions, the second is characterized by extensional subsidence and the third by sedimentary infilling. Luanping basin is a proxy of other similar basins in the Yanshan structural belt in the Early Cretaceous, indicating that late Mesozoic basins are characterised by development of small and isolated basins.

关 键 词：燕山构造带 早白垩世 滦平盆地 沉积过程 盆地演化 

分 类 号：P542.2[天文地球—构造地质学] P512.2[天文地球—地质学]