摘要
导源于古特提斯海关闭的印支运动,使扬子和华北地台分别向大别-胶南造山带的陆内俯冲和挤压,使扬子地台本身也产生了以基底拆离-盖层多层次滑脱为主要方式的变形改造。由江南-雪峰基底拆离推覆隆起带向北挤压所形成的NE至近EW向延伸的川鄂湘黔-苏皖南前缘褶皱-冲断带,在燕山晚期又受到了秦岭-大别-胶南造山带向南仰冲推覆形成的NW至近EW向前陆褶皱冲断带进一步的叠加和改造,最终形成扬子地台南北两侧相向对冲的构造格局。文中还提出了中下扬子区与基底拆离-盖层滑脱构造有关的可能的油气聚集模式。
The Indo-China movement derived from the closure of the Tethys resulted in sub-duction of the Yangtze and North China Platforms to Dabie--Jiaonan Orogenic Belts. Thepolyphase and multilayer basement detaching and thrust-nappe of Qinling-Dabie--JiaonanOrogenic Belts resulted in super--imposition of a series of nappe sheets in different grades,different scales and different deformation intensities, which was the main tectonic style forthe formation of the orogenic belts. The orogenic belts then obducted to the Yangtze andNorth China Platforms with the displacement of 20--40 km respectively during late Yen-shanian. In the process of the northward subduction, the Yangtze Platform itself had been ex-perienced the reformation dominated by basement detaching and multilayer decollement ofcaprocks. The NE--near EW trend Sichuan, Hubei, Hunan, Guizhou--Jiangsu, SouthAnhui frontal folding--thrusting belt which formed under the northward compression-overthrusting of the Jiangnan--Xuefeng basement detaching napping--uplift belt was super-imposed and further reformed by the NW--near EW trend foreland folded-thrust beltcaused by the southward obduction and thrusting--compression of the Qingling--Dabie-Jiaonan Orogenic Belts. Finally, the tectonic framework of opposite thrusting formed atboth the south and north sides of the Yangtze Platform. The main trap types for hydrocarbon accumulation may occur at the followingplaces: the trailing adge of basement detaching-thrusting uplift belt, the decollement folds at the faulted flat overlain by gliding nappes, X-type joint groups at footwall ramp, thefault-extending--decollement folding superimposed by Meso--Cenozoic fault-depressedbasins within the faulted flat of lower thrusting sheet, the monadnock on ancient erosivesurface, the mixed folds of high and duplex thrust structures at blind thrusted front.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1991年第4期376-386,共11页
Oil & Gas Geology
基金
"七.五"国家重点科研攻关54-02项目的三级专题
地质行业科学技术发展基金
