西太平洋俯冲带的演变:来自东北亚陆缘增生杂岩的制约  

Evolution of western Pacific subduction zones:Constraints from accretionary complexes in NE Asian continental margin

作　　者：许文良[1,2] 王旖旎[1] 王枫[1] 唐杰[1] 龙欣雨 董玉[1] 李宇 张兴洲[1] XU Wenliang;WANG Yini;WANG Feng;TANG Jie;LONG Xinyu;DONG Yu;LI Yu;ZHANG Xingzhou(College of Earth Sciences,Jilin University,Changchun,130061;Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Natural Resources,Changchun,130061;State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029)

机构地区：[1]吉林大学地球科学学院,长春130061 [2]吉林大学自然资源部东北亚矿产资源评价重点实验室,长春130061 [3]中国科学院地质与地球物理研究所,北京100029

出　　处：《地质论评》2022年第1期1-17,共17页Geological Review

基　　金：国家自然科学基金资助项目(编号:91858211,42072071)的成果。

摘　　要：本文系统总结了东北亚陆缘晚古生代和中生代增生杂岩的构成与形成时代,并结合同时代火成岩组合及其时空变异以及沉积建造组合,重塑了西太平洋板块俯冲带的演变历史。结果表明:①位于佳木斯地块东缘的跃进山杂岩代表了二叠纪俯冲带,它是古亚洲洋构造体制的产物;②侏罗纪增生杂岩代表了侏罗纪俯冲带,与陆缘同期钙碱性火成岩组合以及含煤建造一起,共同揭示了古太平洋板块西向俯冲的开始;③侏罗纪增生杂岩中—晚侏罗世和早白垩世早期陆源碎屑岩物源的变化,与古地磁和生物学证据一起,共同揭示了古太平洋板块小角度斜向俯冲和东北亚陆缘走滑的构造属性,导致了低纬度侏罗纪增生杂岩向高纬度的推移;④白垩纪—古近纪增生杂岩与陆缘白垩纪—古近纪岩浆作用一起代表了该期俯冲带的存在,自早白垩世到晚白垩世再到古近纪岩浆作用范围向海沟方向的收缩,揭示了古太平洋板块西向俯冲以及俯冲板片后撤(rollback)过程的发生,同时标志着东亚大地幔楔的形成;⑤古近纪晚期—新近纪早期日本海的打开,标志着现今太平洋板块俯冲带以及东北亚大地幔楔的形成。This paper systematically summarizes recent achievements in fossil accretionary complex studies in NE Asia,together with analysis of spatial—temporal variations of the coeval igneous rock association and sedimentary formations in NE Asia,with the aim of understanding the evolutionary history of the western Pacific subduction zones in NE Asia.The results indicate that:①the Yuejinshan accretionary complex represents the Permian subduction zone in the eastern Jiamusi Massif,and resulted from the evolution of the Paleo-Asian Oceanic regime;②Jurassic accretionary complex represents the Jurassic subduction zone in NE Asia,and together with the coeval calc—alkaline volcanic rocks,reveals the subduction onset of the Paleo-Pacific plate beneath the Eurasia;③provenance variations of terrigenous clastic rocks within the Jurassic complexes,together with paleomagnetic and biological data,indicate that a small angle of oblique subduction of the Paleo-Pacific plate and strike-slip tectonics took place in NE Asian continental margin,resulting in northward movement of the Jurassic complexes from lowaltitude to high-altitude;④Cretaceous—Paleogene accretionary complex represents Cretaceous—Paleogene subduction zone in NE Asia.Toward trench contracting of extents of the Cretaceous—Paleogene magmatisms reveals the westward subduction of the Paleo-Pacific plate and rollback of the subducted slab,and marks the formation of the eastern Asian big mantle wedge;and⑤the opening of the Japan Sea at the end of Paleogene and early stage of Neogene marks the formation of the present Pacific subduction zone and the northeastern Asian big mantle wedge.

关 键 词：东北亚陆缘 晚古生代和中生代 增生杂岩 古亚洲洋体制 环太平洋体制 俯冲带演变 

分 类 号：P587[天文地球—岩石学] P542[天文地球—地质学]