摘要
中国中央造山系是由亲劳亚的北方陆块群、亲冈瓦纳的南方陆块群及其间大量过渡性微陆块历经复杂拼合而成的复合型造山带,是中国大陆完成主体拼合的构造结合带。中央造山系自西而东包括昆仑造山带、祁连造山带和秦岭-大别造山带,保存了古生代—早中生代时期华北、华南、柴达木、塔里木、羌塘等众多大小陆块造山过程的丰富信息,是研究东特提斯构造域原、古特提斯洋构造演化的重要窗口。本文综述了中央造山系地质、地球化学和高精度年代学等多学科研究成果,得到以下主要认识:(1)550 Ma之前,众多大小陆块孤立散布于原特提斯洋;(2)541~485 Ma,原特提斯洋各分支开始俯冲;(3)485~444 Ma,原特提斯洋持续俯冲,导致秦岭二郎坪弧后盆地、昆仑祁漫塔格弧后盆地打开;(4)444~420 Ma,原特提斯北祁连洋、南祁连洋和商丹洋闭合,昆仑祁漫塔格弧后盆地关闭;(5)420~300 Ma,昆仑地区古特提斯洋继承原特提斯洋,古特提斯勉略洋逐步扩张;(6)300~250 Ma,昆仑洋自阿其克库勒湖-昆中缝合带向木孜塔格-布青山-阿尼玛卿缝合带发生俯冲后撤;(7)250~200 Ma,原-古特提斯昆仑洋、古特提斯勉略洋关闭;(8)200 Ma以来,中央造山系转入陆内造山阶段。
The Central China Orogenic Belt is a compound orogenic belt formed by the complex amalgamation of many Laurasia-associated northern blocks,Gondwana-associated southern blocks,and many transitional micro-blocks in-between.It is a tectonic combination zone where the main body of China's Mainland has been assembled.The Central China Orogenic Belt includes,from west to east,the Kunlun Orogen,Qilian Orogen,and Qinling-Dabie Orogen,and preserves abundant information on the Paleozoic-Early Mesozoic orogenic processes of North China,South China,Qaidam,Tarim,and Qiangtang Blocks.It offers a critical window to study the tectonic evolution from Proto-Tethys to Paleo-Tethys Oceans in the East Tethys tectonic domain.This contribution reviews the geological,geochemical and high-precision geochronology dataset from the Central China Orogenic Belt,and draws the following main conclusions:(1)Before 550 Ma,many large-small-sized blocks were isolated and scattered in the Proto-Tethys Ocean;(2)During 541~485 Ma,all branches of the Proto-Tethys Ocean began to subduct;(3)During 485~444 Ma,the Proto-Tethys Ocean continued to subduct,resulting in the opening of the Erlangping back-arc basin in the Qinling area and the Qimantagh back-arc basin in the Kunlun area;(4)During 444~420 Ma,the Paleo-Tethys North Qilian,South Qilian,and Shangdan Oceans and Qimantagh back-arc basin were closed;(5)At 420~300 Ma,the Paleo-Tethys Ocean inherited the Proto-Tethys Ocean in the Kunlun area,and the Paleo-Tethys Mianlue Ocean gradually spread;(6)During 300~250 Ma,the Kunlun Ocean subducted and retreated from the Aqikekulehu-Kunzhong suture to the Muztagh-Buqingshan-Anemaqen suture;(7)During 250~200 Ma,the Proto-and Paleo-Tethys Kunlun Ocean and the Paleo-Tethys Mianlue Ocean were closed;(8)Since 200 Ma,the Central China Orogenic Belt transitioned into intracontinental orogeny.
作者
董云鹏
惠博
孙圣思
杨钊
张菲菲
何登峰
孙娇鹏
史小辉
DONG Yunpeng;HUI Bo;SUN Shengsi;YANG Zhao;ZHANG Feifei;HE Dengfeng;SUN Jiaopeng;SHI Xiaohui(State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xian,Shaanxi 710069,China)
出处
《地质学报》
EI
CAS
CSCD
北大核心
2022年第10期3426-3448,共23页
Acta Geologica Sinica
基金
国家自然科学基金项目(编号41930217、42022016、42042006)资助的成果。
