皖南江南陆内造山带的基本特征与中生代造山过程

皖南地区的江南隆起带 ,在震旦纪—中三叠世与周边一样处于被动大陆边缘海相环境。印支—早燕山期 ,该带成为陆内造山带 ,其中发育了一系列近东西向、向北逆冲的逆冲—推覆构造 ,使基底岩系相互叠置、强烈隆升。江南陆内造山带属板内叠置山系 ,不具阿尔卑斯式远程推覆体。地球物理资料表明 ,该陆内造山带下的地壳和岩石圈曾显著加厚。江南陆内造山带形成于北部华北与扬子板块发生陆—陆碰撞、南部华南板块向北推挤的区域动力学背景下

BASIC CHARACTERISTICS AND MESOZOIC OROGENIC PROCESS OF THE JIANGNAN INTRACONTINENTAL OROGENICBELTINSOUTHERNANHUI

Like surrounding areas,the Jiangnan uplift belt in southern Anhui was situated on a passive continental margin during Sinian to Middle Triassic.The belt turns to an intracontinental orogenic belt during Indosinian to Early Yanshanian period.A series of nearly E-W striking,northward-thrusting thrusts and nappes were developed during the orogenic process, leading to stacking and intense uplifting of the basement rocks.The belt belongs to intracontinental stacked mountains without Alps-type long-distance nappes.According to geophysical data,the crust and lithosphere were obviously thickened under the belt.The Jiangnan intracontinental orogenic belt was developed under the regional dynamic background of continent-continent collision between the North China and Yangtze plates in the north and northward-pushing of the South China plate(the Cathaysian Block and South China Caledonian fold belt) in the south.