摘要
覆盖区侏罗—白垩系分布、变形特征及构造演化对理解华北克拉通破坏过程具有重要意义。根据编制的地层分布图和地震资料解释,研究了渤海海域侏罗—白垩纪时期沉积、构造变形及演化特征。渤海海域燕山期构造变形与板块俯冲引起的地幔上拱有关。早-中侏罗世,库拉—伊泽奈崎板块北西向俯冲,地层展布继承了印支期古构造格局,呈近东西向,属于坳陷成盆期。晚侏罗—早白垩世,库拉—伊泽奈崎板块北北西向俯冲,火山活动强烈,为热拱断陷期。受郯庐断裂左行活动影响,地层展布具有明显分带性,多呈北东—南西向和北西西—南东东向。晚白垩世,太平洋板块北西向俯冲挤压,岩浆冷凝,进入萎缩隆褶期。
Sedimentary,deformation characteristics and tectonic evolution of Jurassic-Cretaceous in the Bohai region are important to interpret destruction of the North China Craton. Based on the compilation of stratigraphic distribution maps and the interpretation of seismic data. This paper studies the sedimentary characteristics, tectonic deformation and evolution from Jurassic to Cretaceous. Tectonic deformations from Jurassic to Cretaceous in the Bohai region are related to mantlebulge caused by plate subduction. During Early and Middle Jurassic, the Kula-Izanagi plate subducted toward NW. The strata distributed in nearly E-W direction, succeeding the paleotectonic framework of Indo-Chinese epoch. During Late Jurassic and Early Cretaceous,the Kula-Izanagi plate subducted toward NNW. There existed intensive volcanic activities and a series of rifted basins. Due to the Tancheng-Lujiang strike-slip fault, stratigraphic distributions displayed in NE-SW and NWW-SEE, showing zonational characteristics. During Late Cretaceous,the Pacific plate subducted toward NW and the magma cooled down. The tectonic evolution entered a stage of withering-rising-folding.
出处
《地质科学》
CAS
CSCD
北大核心
2012年第2期306-317,共12页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金重点项目(编号:90814007)资助
关键词
渤海海域
侏罗—白垩纪
沉积
构造
构造演化
Bohai region,Jurassic-Cretaceous,Sedimentary,Tectonic,Tectonic evolution
