东亚大汇聚与中—新生代地球表层系统演变

发布时间：2018-05-22 13:16

本文选题：大汇聚 + 地形倒转　；参考：《海洋地质与第四纪地质》2017年04期

【摘要】：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。
[Abstract]:East Asia has long been in the large converging tectonic setting of the ancient Asian Ocean, the Tethys ocean and the ancient Pacific. After the Indosinian movement, the east edge of East Asia formed a unified passive continental margin. With the initiation of the late three fold subduction of the paleo Pacific plate, the passive large land edge of East Asia was transformed into the active continental margin and developed and subducted in the eastern margin of East Asia. The associated ophiolite and I type granite. The late three fold and Middle Jurassic, the paleopacific subduction zone continued to migrate westward, and the compression stress caused by the subduction of the plate affected the interior of East Asia, and the tectonic system was gradually controlled from the E to the Tethys tectonic domain and the Gu Yazhou ocean tectonic domain to the NE paleopacific structure. The transition of domain control. The late Jurassic Early Cretaceous (160~135 Ma), the paleo Pacific plate continued westward, East Asia was controlled by compression and strike stress field, the Andean active continental margin and the eastern North China Plateau formed, developed a small amount of AAQ rock. The early Cretaceous late period (135~90 Ma), the ancient Pacific subduction zone withdrew eastward, East Asia land. The reason is that the extrusion strike slip stress field is transformed into tension and strike slip stress field, the Andean continental margin is destroyed, the eastern North China Plateau begins to collapse, with a large number of adakic rocks and metamorphic core complexes. In the late Cretaceous, the extension of East Asia weakened with the withdrawal of the subduction zone. The Cenozoic East Asia has undergone giant topographic reversals. The collision of the degree plate and the Eurasian plate eventually leads to the uplift of the Qinghai Tibet Plateau in Western China. On the contrary, the basin group of the Bohai Bay Basin and the sea area in eastern China is formed; the tectonic basin magma belt is characterized by the migration of the west to the East, and the initial period of the basin group is mainly in the Paleogene, forming a new high east low geomorphic pattern. The basins in the Neogene are converted from the fault depression to the fast depression, while the extensional structures in East Asia are mainly restricted by the uplift of the Qinghai Tibet Plateau.
【作者单位】：海底科学与探测技术教育部重点实验室中国海洋大学海洋地球科学学院;青岛海洋科学与技术国家实验室海洋地质功能实验室;
【基金】：国家重点研发计划项目(2017YFC0601401,2016YF C0601002) 国家自然科学基金杰出青年基金(41325009);国家自然科学基金项目(41402172,41190072,41502185,41502321和U1606401) 山东省泰山学者特聘教授项目鳌山卓越科学家计划(2015ASTP-0S10 国家海洋局重大专项(GASI-GEOGE-01)
【分类号】：P542

【相似文献】