摘要
侏罗纪以来,中国东部发生了强烈而频繁的构造运动,其中以燕山运动最为重要,从而将本区侏罗纪至早第三纪的盆地发展划分为两个不同的阶段——燕山亚旋迥(J—K_(1)^(1))及华北亚旋迴(K_(1)^(2)—E)。盆地的基底及构造应力场对盆地的沉积-构造发展起着明显的控制作用。在不同的应力状态下可以形成不同的断陷盆地。此外,在本区盆地形成时,剪切应力也起着重要的作用。
This paper discusses some problems on the sedimentary-tectonic development of the Meso-Cenozoic basins in eastern China.1.Since the Jurassic,repeated tectonic movements have taken place in eastern China,showing different manifestations and exerting different effects on the sedimentary-tectonic development in the basins.The major movements include(1)the Yanshanian movement after the early Early Cretaceous(K_(1)^(1));(2)the Mincheian movement after the middle Late Cretaceous(K_(2)^(2));and(3)the North China movement after the Oligocene(E_(3)).Of these,the Yanshanian movement is the most important one which brought about a great change in the tectonic-palaeogeographic framework and a marked turn of the regional tectonic stress field in eastern China.Thus,the Yanshanian movement can be considered as a boundary to seperate two subcycles,i.e.the Yanshanian and the North China subcycles,and the former is characterized by orogenesis,while the latter by basining.2.The basement structures of the basins played an evident role in the formation and development of the basins.So the basins formed on different basements are somewhat different in scale and structrual deformation of the cover,and their structrual direction is usually controlled by the basements as well.3.The tectonic stress is an essential factor for controlling the formation and sedimentary-tectonic development of the basins.In this paper,the tensional down-faulted basins are divided into two types.One involves those resulting from the crustal extension and the other the secondary surface tensional down-faulted basins produced by rupture along the top of the uplifts due to the crustal compression,reflecting different stress states of the regional structures.In terms of the tectonic stress states during the Meso-Cenozoic in eastern China,the characteristics of the stress are that:firstly the tensional and compressional stress vary with time and are different in different areas and tectonic stages;secondly the effect of shearing stress on the formation and development of the basins should not be neglected apart from the effects of the tensional and compressional stress.
作者
刘训
Liu Xun(Institute of Geology,Chinese Academy of Geological Sciences)
出处
《地质学报》
1988年第2期111-122,共12页
Acta Geologica Sinica
