东北亚地区晚侏罗—白垩纪构造格架主体特点
Main Characteristics of Late Jurassic-Cretaceous Tectonic Framework in Northeast Asia
摘要
将东北地区主体构造特征置于东北亚大地构造背景中进行分析,可将东北亚地区晚中生代—古近纪的构造演化划分为3个时段:1)中—晚侏罗世,特提斯洋扩张及古北美大陆板块与古欧亚大陆之间的碰撞,致使蒙古—鄂霍茨克湾闭合,形成大规模深层次逆冲构造；并在南蒙古和华北地块北缘产生远距离的构造叠加效应.2)晚侏罗—早白垩世,特提斯洋板块、古太平洋构造域(包括古太平洋和伊泽纳奇板块)与古欧亚大陆之间的联合作用,导致亚洲东部大陆地壳向东蠕散、伸展和断块活动,伴随发育小型断陷盆地和变质核杂岩.3)早白垩世末(阿尔布晚期)—新近纪(中新世),特提斯洋板块(后期包括印度大陆)、太平洋构造域与欧亚大陆间的联合作用,导致古太平洋(或伊泽纳奇板块)消失及鄂霍茨克海微板块与欧亚大陆之间的碰撞,在大陆边缘叠加形成火山-深成岩带和坳陷盆地.在100～40 Ma期间,太平洋构造域与欧亚大陆之间的相互作用,对欧亚大陆东部边缘产生重大影响,在导致大陆岩石圈-地壳减薄、地慢类型转变和强烈深成构造-岩浆活动的同时,也产生一系列与大陆边缘断块活动有关的浅层效应.
Abstract
Placing the main structural features of the Northeast China into Northeast Asia area, to analyze the tectonic setting, the Northeast Asia Late Mesozoic - Paleogene tectonic evolution can be divided into three periods: 1) the Middle -Late Jurassic, extension of the Tethys Ocean and the collision between North America and ancient Eurasia continental plate, resulting in Mongolia-Okhotsk Gulf closure and the formation of large-scale deep-level thrust in Mongolia and the North China block, and a long-range stacking effect in southern Mongolia and the northern margin of the North China block. 2) Late Jurassic - Early Cretaceous, the combined effects of Tethys Ocean, the Eurasian continental plate and the Paleo-Pacific tectonic domain (including the old Pacific or Izanaqi plate) .resulted in continental crust creeping eastward, stretching and block breaking activities, which were, accompanied by development of a small rift basin group and metamorphic core complexes. 3) Early Cretaceous (Late Albian)- Neogene (Miocene), the combined effects of the tectonic domain between Tethys (later including the Indian plate), the Pacific tectonic domain (including Izanaqi plate) and Eurasia continental plate resulted in Izanaqi ocean disappeared, the collision between the Okhotsk Oceanic micro-plate and the Eurasian continent, and the formations of the Eurasian continental margin volcanic belt and the depression basin on the continental margin. During 100 - 60 Ma, the interaction between the Pacific tectonic domain (including Izanaqi plate) and the Eurasian continent, had a major influence on the eastern edge of the Eurasian continent and caused continental lithospheric-crust thinning, the change of mantle type and a strong deep magmatic activity. Meanwhile, producing a series of the surface block effects related to the continental margin faulted block activities.
关键词
东北亚/晚中生代/构造格架/构造域关系/构造Key words
Northeast Asia/Late Mesozoicj tectonic framework/relationship between tectonic domain/tectonics引用本文复制引用
基金项目
中国地质调查局地质大调查项目(1212010813032)
出版年
2011
NETL
NSTL
维普
万方数据