东亚大汇聚与中—新生代地球表层系统演变

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东亚长期处于古亚洲洋、特提斯洋和古太平洋三大构造域的大汇聚构造背景之下。印支运动后,东亚东缘形成了统一的被动大陆边缘,随着晚三叠世古太平洋板块俯冲的启动,东亚东缘的被动大陆边缘转化为主动大陆边缘,发育了与俯冲相关的蛇绿岩、I型花岗岩。晚三叠世—中侏罗世,古太平洋俯冲带持续向西迁移,板块俯冲产生的挤压应力影响到了东亚内部,发生广泛构造变形,构造体制从受E—W向特提斯构造域和古亚洲洋构造域控制逐渐向受NE向的古太平洋构造域控制转变。晚侏罗世—早白垩世早期(160~135 Ma),古太平洋板块继续西进,东亚被挤压-走滑的应力场控制,安第斯型主动大陆边缘和华北东部高原最终形成,发育少量的埃达克岩。早白垩世晚期(135~90 Ma),古太平洋俯冲带向东后撤,东亚陆缘由挤压-走滑应力场转变为拉张-走滑应力场,安第斯型大陆边缘被破坏,华北东部高原开始垮塌,伴随大量的埃达克岩、变质核杂岩的出现。在晚白垩世,随着俯冲带的后撤,东亚内部伸展作用减弱。新生代东亚发生了巨型的地形倒转,印度板块与欧亚板块碰撞最终导致中国西部的青藏高原隆升,相反,中国东部渤海湾盆地和海区的盆地群形成;构造-盆地-岩浆带体现出自西向东迁移的特征,盆地群起始时代主要在古近纪,形成了新生代西高东低的台阶式地貌格局。在新近纪盆地群由断陷转为快速拗陷,同时东亚内部的伸展构造主要受青藏高原隆起制约。 East Asia has long been in the context of the great convergence of the three major tectonic domains of the Paleo-Asian Ocean, the Tethys Ocean and the Paleo-Pacific Ocean. After the Indo-Chinese Movement, a unified passive continental margin was formed on the eastern edge of East Asia. With the subduction of the Late Triassic Paleo-Pacific plate slab, the passive continental margins on the eastern edge of East Asia were transformed into active continental margins, and subduction-related ophiolite , I type granite. Late Triassic-Middle Jurassic and Paleo-Pacific subduction continued to migrate to the west. The compressive stress caused by plate subduction affected the interior of East Asia and resulted in extensive tectonic deformation. From the E-W to the Tethys and Control of tectonic domination of the Paleo-Asian Ocean gradually shifted from NE-controlled Paleo-Pacific tectonic control. During the Late Jurassic-Early Cretaceous (160-135 Ma), the Paleo-Pacific plate continued its westward advance. East Asia was controlled by the extrusion-strike-slip stress field. The Andean active continental margin and the eastern North China Plateau eventually formed with a small amount of Adak rock. In the late Early Cretaceous (135-90 Ma), the subduction zone of the ancient Pacific retreats eastward. The East Asian continental margin changes from extrusion-strike-slip stress field to tensile-strike-slip stress field, and the Andean continental margin is destroyed. The eastern North China Plateau Began to collapse, accompanied by a large number of adakite, metamorphic core complex appears. In Late Cretaceous, with the retreat of the subduction zone, the extensional effect of East Asia weakens. In the Cenozoic East Asia, a huge terrain reversal occurred. The collision between the Indian plate and the Eurasian plate eventually led to the uplift of the Qinghai-Tibet Plateau in western China. On the contrary, the basin groups in the Bohai Bay and the sea areas in eastern China formed. The tectonic-basin- East migration characteristics of the basin group initial era mainly in the Paleogene, forming the Cenozoic high-east low step-level landscape pattern. In the Neogene, the basin group changed from fault depression to rapid depression, meanwhile, the extensional structure in East Asia was mainly controlled by the uplift of the Qinghai-Tibet Plateau.
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