CAJ | 학술논문

华东地区三叠纪海相沉积仅存在于早―中三叠世时期。它们既是区域构造控盆沉积作用下的产物，也能够反演区域印支构造运动的作用型式和演变历程。华东地区的海相三叠系可以划分为2个地层区和6个地层分区。各地层分区内的地层序列可以按照地层的时间属性和连续的空间沉积古地理分异，整合为一套统一的岩石地层单元，仅局部岩相差异较大的地质体可采用单独的地层名称。借助于生物和环境事件标志，可以进行区域地层对比。地层序列的时空分异表明，印支构造运动的第一幕或序幕可能始于早三叠世晚期，这时在扬子地块的北部已与华北地块对接形成一系列局限的次级边缘海盆，并于最后于中三叠世晚期彻底关闭；与此同时，扬子地块南缘与华夏地块之间也于早三叠世晚期逐步被挤压变陡，形成台-坡-盆沉积体系，并且于早三叠世末被关闭，从而在中三叠世形成统一的沉积盆地。
화동지구삼첩기해상침적부존재우조―중삼첩세시기。타문기시구역구조공분침적작용하적산물，야능구반연구역인지구조운동적작용형식화연변역정。화동지구적해상삼첩계가이화분위2개지층구화6개지층분구。각지층분구내적지층서렬가이안조지층적시간속성화련속적공간침적고지리분이，정합위일투통일적암석지층단원，부국부암상차이교대적지질체가채용단독적지층명칭。차조우생물화배경사건표지，가이진행구역지층대비。지층서렬적시공분이표명，인지구조운동적제일막혹서막가능시우조삼첩세만기，저시재양자지괴적북부이여화북지괴대접형성일계렬국한적차급변연해분，병우최후우중삼첩세만기철저관폐；여차동시，양자지괴남연여화하지괴지간야우조삼첩세만기축보피제압변두，형성태-파-분침적체계，병차우조삼첩세말피관폐，종이재중삼첩세형성통일적침적분지。
Marine Triassic sedimentation of east China occurred only in the Early-Middle Triassic time. The marine Lower-Middle Triassic successions not only are the depositional products in the sedimentary basins controlled by the regional tectonism but also represent the tectonic pattern and process of the Indosinian movement in the region. The Triassic strata of east China can be divided into two stratigraphic regions and six stratigraphic subregions. The stratigraphic sequences within each stratigraphic region can be unified into a uniform lithostratigraphic system according to the time attribute and lithofacies paleogeographic affiliation of the stratigraphic units, except for some specific geological bodies of quite distinctive lithofacies that can be separately named. The lithostratigraphic sequences can be well correlated on the basis of the integrated study of some characteristic paleontological and environmental events. The spatial and temporal variation of stratigraphic sequence indicates that the first episode or prologue of the Indosinian movement should have taken place in the late Early Triassic period, which resulted in the formation of a series of secondary marginal seas in the northern part of the Yangtze block due to its suturing with the North China block after that time, and the suture zone was finally closed in the late Middle Triassic. In the meantime, the southern margin of the Yangtze block became steepened to form a platform-slope-basin sedimentary system during the late Early Triassic with the compression of the Cathaysia block, and the deep basin was finally closed at the end of the Early Triassic, whereas united clastic sedimentary basins across the blocks occurred in the Middle Triassic.