北方侏罗、白垩系盆地形成、演化及地球动力学背景Formation, Evolution and Earth Dynamics of Jurassic and Cretaceous Basins in Northern China
张晓东,王颖,李桂荣
ZHANG Xiao-dong; et al. (Exploration and Development Research Institute of Daqing Oilfield Company Ltd.; Daqing 163712;
摘要(Abstract)：
通过中国北方侏罗、白垩系盆地演化特征的研究,认为盆地发育具有西早东晚的特点,早、中侏罗世,西北地区发育了近东西向的断陷盆地群,晚侏罗世晚期,蒙古东部、东北地区喷发了大面积的火山岩,早白垩世早期,东北地区发育了北北东、北东向的断陷盆地群。这样的盆地演化过程归结为其周缘的四大板块共同作用的结果。即:早、中侏罗世,由于华北板块向北运动的速度减慢和塔里木板块的向南运动,在西北地区和华北板块西北缘形成拉张环境,引起地幔上涌,导致近东西向的伸展断陷盆地群的形成;晚侏罗世晚期,西伯利亚板块向南相对运动,在泛东北地区产生一个从西到东发散的地幔对流应力场,使地幔对流物质向东流动,产生了火山喷发和早白垩世的伸展断陷盆地群的形成;早白垩世晚期,盆地群整体受挤压应力作用,但松辽盆地深部俯冲的板块由于长期受热流的作用,在青山口组时期发生了地幔拆沉作用,形成了一次热流高峰期,表现为一个弱拉张环境,使松辽盆地沉积了巨厚的坳陷期地层。
Based on study on evolution characteristic of Jurassic and Cretaceous basins in northern China, this paper shows that they have the characteristic of early in the west and late in the east. In early and middle Jurassic, nearly EW rift basin group developed in northwest area. In later period of late Jurassic, a large area of volcanic rocks erupted in eastern and northeastern Mongolia. In early period of early Cretaceous, NNE and NE rift basin group developed in northeastern area. This evolution process is the result of the co-effect of four large surrounding plates, ie., in early and middle Jurassic, Huabei Plate moved slowing down northward and Tarim Plate moved southward; in northwest area, the northwest edge of Huabei Plate formed extensional environment, causing mantle swelling, and leading to the formation of the nearly EW extensional rift basin group. In later period of late Jurassic, Siberia Plate moved relatively southward, forming a mantle convection stress field exhaling from west to east in the whole northeast area, making mantle convection material flow eastward and causing volcano eruption and formation of extensional rift basin group. In late period of early Cretaceous, the basin group was affected by extrusion stress. However, the dive plate in the deep part of Songliao Basin was influenced by heat flow, mantle subsidence happened in Qingshankou Formation. This formed a heat flow peak, appearing as a weak extensional environment, and making thick depression period formation deposit in Songliao Basin.
关键词(KeyWords)：
盆地演化;地幔对流;板块构造;火山岩;动力学
basin evolution; mantle convection; plate structure; volcanic rock; dynamics
基金项目(Foundation):
作者(Authors):
张晓东,王颖,李桂荣
ZHANG Xiao-dong; et al. (Exploration and Development Research Institute of Daqing Oilfield Company Ltd.; Daqing 163712;
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