北黄海盆地东部坳陷中新生代的叠合盆地特征及其成因

发布时间：2018-03-24 20:47

本文选题：构造样式　切入点：构造演化　出处：《海洋地质与第四纪地质》2016年05期

【摘要】：以最新的地质-地球物理资料为基础,分析了北黄海盆地东部坳陷的断裂特征及构造样式,总结了研究区的沉积-构造演化阶段。研究表明:东部坳陷断裂发育,F1、F2断层为最重要的控制性断层,其次为F9、F10、F11、F8断层,同时在研究区识别出了伸展、挤压、扭动、反转等构造样式;结合构造研究与沉积发育史,将东部坳陷的沉积-构造演化划分为中侏罗世初始断陷期、晚侏罗世断陷扩展期、早白垩世断拗期、早白垩世晚期-始新世构造反转期、渐新世强烈断陷期、渐新世末-中新世初构造反转期、中新世-第四纪区域沉降期。以上述研究为基础,参考区域地质背景探讨了东部坳陷的成因机制:中侏罗世,研究区的初始断陷与块体逃逸的伸展作用有关;晚侏罗世,板块俯冲导致地壳减薄,东部坳陷持续断陷;早白垩世,由于伊泽奈崎板块运动行为变化使郯庐断裂左行走滑,在区域左旋并伴随热沉降的同时研究区发生断拗;晚白垩世,板块正向俯冲导致东部坳陷挤压反转并持续至始新世;渐新世,因太平洋板块转向、俯冲带后撤及印度-欧亚大陆碰撞,导致郯庐断裂带右旋,研究区在右旋张扭背景中强烈断陷;渐新世末,由于太平洋板块俯冲速率、印度-欧亚板块远程效应的增强及俯冲带抑制作用,研究区再次发生构造反转;中新世-第四纪,东部坳陷因岩石圈热衰减发生区域沉降。
[Abstract]:In the latest geological geophysical data as the foundation, analyzed the fracture characteristics and structural style of North Eastern the Yellow Sea basin depression, summarized the sedimentary tectonic evolution of the study area. Research shows that the development of eastern depression fracture F1, F2 fault for controlling fault is the most important, followed by F9, F10 at the same time, F11, F8 faults in the study area to identify the stretching, twisting, extrusion, reverse tectonic style; combined with the research and development history of sedimentary structures, the sedimentary tectonic evolution of the eastern depression is divided into Middle Jurassic initial rifting stage, expanding in Late Jurassic Early Cretaceous faulted period, fault depression period, early the late Cretaceous Eocene Oligocene tectonic inversion stage, strong rifting stage, late Oligocene Miocene early tectonic inversion period, Miocene quaternary regional subsidence period. Based on the above research, the regional geological background reference discussed the formation mechanism of the Jurassic in the eastern depression, In the escape and block extension on the initial study area; Late Jurassic subduction resulted in crustal thinning, eastern depression continued fault depression; Early Cretaceous, Isawa Nagasaki due to plate movement behavior changes to the Tanlu fault sinistral strike slip, in regional sinistral and with heat sinking and research zone fault depression; Late Cretaceous, plate is subducting to inversion and continued until the Eocene of eastern depression; Oligocene, turn to the Pacific plate subduction zone, retreat and India Eurasia collision, resulting in a dextral Tanlu fault zone, the study area in the right spin transtensional faulted background; the end of Oligocene due to the subduction of the Pacific plate rate enhanced, and subduction of the India Eurasia with the remote effect of inhibition, the study area occurred again tectonic inversion; Quaternary Miocene, due to lithospheric thermal decay occurs regional subsidence in the eastern depression.

【作者单位】：国土资源部海底矿产资源重点实验室广州海洋地质调查局;
【基金】：国家自然科学基金项目(41302100)
【分类号】：P736.1

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