CAJ | 학술논문

辽中凹陷中北段东营组发育多种类型的重力流沉积,它们在形成机制上差别较大.在古地貌恢复的基础上,重建了古地理背景,构建了各沉积时期基本的物源系统和构造格架.通过层序地层研究及物源供给系统分析,明确了重力流的沉积类型、层序位置、发育部位和形成机制,建立了三角洲滑塌浊积扇、坡移浊积扇、近岸水下扇、湖底扇和斜坡扇共五种类型的重力流发育模式.通过沉积要素比较分析,提出了上述重力流的发育是物源系统、坡折类型和湖平面变化耦合作用的结果,辽东凸起的形成演化及以其为主导的构造格局决定着重力流的发育特征及分布规律.
료중요함중북단동영조발육다충류형적중력류침적,타문재형성궤제상차별교대.재고지모회복적기출상,중건료고지리배경,구건료각침적시기기본적물원계통화구조격가.통과층서지층연구급물원공급계통분석,명학료중력류적침적류형、층서위치、발육부위화형성궤제,건립료삼각주활탑탁적선、파이탁적선、근안수하선、호저선화사파선공오충류형적중력류발육모식.통과침적요소비교분석,제출료상술중력류적발육시물원계통、파절류형화호평면변화우합작용적결과,료동철기적형성연화급이기위주도적구조격국결정착중력류적발육특정급분포규률.
There are several types of sedimentary gravity flows of Paleogene Dongying Formation in the central-northern Liaozhong sag. According to the palaeogeographic background analysis on the basis of palaeogeomorphology, the authors reconstruct the provenance system and the structural framework of study area. After studying the sequence stratigraphy and the provenance system, they definite the sedimentary type, sequence position, depositional area and formation mechanism of the gravity flows and set up the depositional models of the delta slump turbidite fan, slop-moving turbidity fan, nearshore subaqueous fans, sublacustrine fan and slope fan. After analyzing the difference of sedimentary elements, they sum up that sedimentary gravity flows are the couping result of provenance system, slop type and lake level fluctuation and that the evolution and dominant structural framework of the Liaodong lift control the sedimentary character and distribution characteristics of the gravity flows.