华北板块南缘原型沉积盆地类型与构造演化

华北板块南缘原型沉积盆地类型受构造演化控制,古生代—中三叠世华北与扬子两大板块由“开”到“合”,华北板块南缘也从被动大陆边缘(Z—O₂)到抬升剥蚀(O₃—C₁)再到前陆复理石沉积盆地(C₂—P₂);晚三叠—早侏罗世,两大板块碰撞造山形成著名的中央造山带,与造山藕合形成磨拉石沉积盆地;中侏罗—早白垩世,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(库拉、伊则奈奇板块)和太平洋板块活动控制,形成伸展断陷和坳陷盆地。不同时期原型盆地类型不同,对于油气勘探原则具有重要意义。 

PROTO-SEDIMENT BASIN TYPES AND TECTONIC EVOLUTION IN THE SOUTHERN EDGE OF NORTH CHINA PLATE

Type of ancestral basin in the Southern North China plate is controlled by tectonic evolution. The North China and Yangtze plates changed from open to close during the Paleozoic era to Middle Triassic epoch. The southern edge of North China Plate changed from passive continental margin(Z-O_2) to uplift denude(O_3-C_1), then to foreland flysch basin(C_2-P_2).The two plates collided and formed the famous Central Orogenic Belt(T_3-J_1) and coupled molasses sedimentary basin. From the Middle Jurassic to Early Cretaceous, postkinematic inner-orogenic belt subsided while orogenic belt margin detached, forming complex structures of backlimb thrust and front detachment. Detached fault-depression and down-warping basin came into being, controlled by activities of the Palaeo-Pacific plate and Pacific plate in late epoch. Different type of ancestral basin in different time is important for oil-gas exploration.