华北板块东南缘原型沉积盆地类型与构造演化

Types of original sedimentary basins and tectonic evolution on southeastern margin of North China plate

余和中 韩守华 谢锦龙 郭庆新 武金云

Yu Hezhong Han Shouhua Xie Jinlong Guo Qingxin Wu Jinyun

华北板块东南缘原型沉积盆地类型受构造演化控制,古生代至中三叠世华北与扬子两大板块由"开"到"合",华北板块东南缘也经历了从震旦纪至中奥陶世的被动大陆边缘,到晚奥陶世至早石炭世早期的抬升剥蚀;早石炭世晚期-中三叠世由于板块的拼合,在大陆边缘形成前陆复理石沉积盆地;晚三叠世-早侏罗世,两大板块碰撞造山形成秦岭一大别造山带,与造山耦合形成磨拉石沉积盆地;中侏罗世-早白垩世,在造山期后造山带内部拆沉的同时,造山带边缘拆离,形成后缘伸展与前缘冲断的复杂构造类型;后期受古太平洋板块和太平洋板块活动控制,形成伸展断陷和坳陷盆地。

The types of original sedimentary basins on southeastern margin of North China plate were controlled by tectonic evolution. North China and Yangtze plates experienced the changes from"divergence"to"convergence"in Paleozoic-Middle Triassic. The southeastern margin of North China plate correspondingly experienced the changes from passive continental margin in Sinian-Middle Ordovician(Z-O)to uplifting and denudation in Late Ordovician to Early Carboniferous (O-C). During late Early Carboniferous-Middle Triassic (C-P), foreland flysch depositional basins were formed on the continental margin due to convergence of plates. During Late Triassic ?Early Jurassic, Qinling-Dabie orogenic zone was formed through the collision of the two plates, coupled with the formation of molasses sedimentary basins. During Middle Jurassic-Early Cretaceous, the margin of the orogenic belt detached while the epiorogenic subsidence occurred within the orogenic belt, resulting in a complicated structural pattern with outstretching on the trailing edge and thrusting on the leading dege. Outstretched fault-depression and down-warped basins were formed later under the control of the activities of Palaeo-Pacific plate and Pacific plate.

10.11743/ogg20060216