摘要
东北亚大地构造发展经历了古亚洲洋、蒙古—鄂霍茨克洋和古太平洋的俯冲-碰撞作用。如何鉴别和厘定这三种构造体制的时空影响范围和叠合过程一直是一个难题。本文通过巨型岩浆岩带的建库编图,揭示了该地区晚古生代—中生代岩浆岩的时空迁移规律;据此,探讨和厘定了这三大板块构造体制的时空分布范围和构造叠合过程。二叠纪到三叠纪早期间,古亚洲洋体制经历了俯冲到碰撞,主要作用于阿拉善—华北北缘—大兴安岭一带;期间,鄂霍茨克洋主要为陆缘环境,影响范围限于中北部蒙古—外贝加尔一带,并在侏罗纪逐渐向蒙古—鄂霍茨克主缝合带迁移,到白垩纪,其造山带伸展垮塌阶段,影响范围增大,远程效应波及阿拉善—华北北缘—大兴安岭一带,叠加于古亚洲洋体制产物之上。古太平洋构造体制主要发育于三叠纪—侏罗纪时期,其平板俯冲影响范围抵达大兴安岭—太行山,在白垩纪,俯冲板片后撤,影响范围迁移至东亚大陆最东缘。这些作用叠加于古亚洲洋体制产物之上;并与蒙古—鄂霍茨克洋体制同时叠合于大兴安岭一带。
The tectonic evolution of Northeast Asia has experienced the collision and post-collision processes of the Paleo-Asian Ocean, the Mongol-Okhotsk Ocean and the Paleo-Pacific Ocean. However, the spatial-temporal distribution ranges and overlapping processes of these three tectonic regimes have long been difficult to constrain properly. In this paper, we analyzed the spatial-temporal migration patterns of Late Paleozoic-Mesozoic magmatic rocks of Northeast Asia through the constructions of U-Pb age data of giant magmatic belts and a series of data-driven digital maps, with the aim to constrain the tectonic superimposition of the three tectonic regimes. We determined that the extent of each tectonic domain varies in different periods. During the Permian to Jurassic, Paleo-Asian Ocean experienced subduction and collision, which affected mainly the Alxa-northern margin of North China Craton-Da Hinggan Mountains areas;while the Okhotsk Ocean was mainly a continental margin environment, and its influence was initially limited to the central and northern Mongolia and areas around Baikal and then gradually extended to the Mongol-Okhotsk main suture zone in the Jurassic. In the Cretaceous, the Okhotsk Ocean orogenic belt extended and collapsed, which further expanded its influence, with its long-range effect reaching the areas affected by the Paleo-Asian Ocean. Meanwhile, the Paleo-Pacific tectonic system mainly developed in the Triassic to Jurassic, and its plate subduction reached the Da Hinggan-Taihang Mountains area-a gravity gradient zone in the eastern Asian continent, with its long range effect subsequently reaching the easternmost margin of the eastern Asian continent due to the subducting plate retreating during the Cretaceous. Thus, these processes of were superimposed on the products of the Paleo-Asian Oceanic system, together with these of the Mongol-Okhotsk Oceanic system, they all superimposed mainly on the Da Hinggan Mountains region.
作者
王涛
张建军
李舢
童英
郭磊
张晓伟
黄河
张磊
薛怀民
WANG Tao;ZHANG Jianjun;LI Shan;TONG Ying;GUO Lei;ZHANG Xiaowei;HUANG He;ZHANG Lei;XUE Huaimin(Key Laboratory of Deep-Earth Dynamics,Ministry of Natural Resources,Beijing 100037,China;Beijing SHRIMP Center,Beijing 100037,China;Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2022年第2期28-44,共17页
Earth Science Frontiers
基金
国家自然科学基金项目(92162322,42161144007,41830216,41972225)
国家重点基础研究发展计划项目(2018YFC0603702,2019YFA0708600)
中国地质调查局地质调查项目(DD20190370,DD20190685,DD20190001)
国际地学计划项目(IGCP 662)
深时数字地球(DDE)大科学计划项目。
