东北亚陆缘中-新生代主要构造事件的古地磁学制约  

Meso-Cenozoic paleomagnetism constraints on major tectonic events in Northeast Asian continental margin

作　　者：周在征 李三忠[1,2] 姜兆霞 李玺瑶 李阳 ZHOU Zai-zheng;LI San-zhong;JIANG Zhao-xia;LI Xi-yao;LI Yang(Key Lab of Submarine Geosciences and Prospecting Techniques,MOE,Institute for Advanced Ocean Study,College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;Laboratory for Marine Geology and Environment,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China)

机构地区：[1]中国海洋大学海底科学与探测技术教育部重点实验室,海洋高等研究院,海洋地球科学学院,青岛266100 [2]青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室,青岛266237

出　　处：《地球物理学进展》2020年第4期1332-1351,共20页Progress in Geophysics

基　　金：国家重点研发计划项目(2017YFC0601401,2016YFC0601002);国家科技重大专项(2016ZX05004001);青岛海洋科学与技术国家实验室鳌山科技创新计划项目(2016ASKJ13);国家自然科学基金项目(41502321,U1606401)联合资助。

摘　　要：东北亚陆缘位于西太平洋洋-陆过渡带的北段,中-新生代经历了古洋盆的闭合与打开,陆缘弧的发育,洋底高原、洋内弧与弧前盆地的侧向增生等复杂的构造演化过程.本文系统梳理了东北亚陆缘的古地磁数据,涉及华北东部、朝鲜半岛、佳木斯—兴凯、那丹哈达、俄罗斯远东和日本等地区.作为定量研究地块运动有效的方法,古地磁资料对该地区几个主要构造过程起到了关键的制约作用,包括牡丹江洋的闭合、日本海的打开、陆内块体旋转或调整运动、陆缘增生楔的就位过程以及西北太平洋洋内岛弧系统的运移过程等.同时,东北亚陆缘古地磁研究目前还存在诸多问题,如数据时空分布的不均匀性、同区域构造解析结合的薄弱性以及对探讨块体动力学机制的局限性等.未来应着重在以下几个方面开展工作:加强对数据缺乏区的古地磁研究,开展该地区磁组构的构造应用研究,同精细构造解析相结合深度挖掘数据意义以及开展地球动力学数值模拟工作以探究块体运动的动力学机制等.The Northeast Asian continental margin is located in the northern part of the West Pacific Continent-Ocean Connection Zone.It has experienced the closure and opening of the paleo-oceans,the formation of the continental marginal arc,and accretion or docking of the oceanic plateaus,the intra-oceanic arc and the fore-arc basin.This paper systematically reviews the available paleomagnetic data in the Northeast Asian continental margin,including the eastern North China Block,the Korean Peninsula,the Jiamusi-Khanka Terrane,the Nadanhada Terrane,the Far East Russia and Japan areas.As an effective approach for deciphering the horizontal movements of crustal elements,paleomagnetism has played a key role in assessment of several significant tectonic events in this region,including the closure of the Paleo-Mudanjiang Ocean,the opening of the Japan Sea,the intracontinental rotations,the motions and emplacements of accretionary prisms,and the trajectories of the intra-ocean arc system in the Northwest Pacific Ocean before these docking times.However,there are still several issues in the paleomagnetic studies in the Northeast Asian continental margin,such as the uneven of spatial and temporal distribution of data,the paucity of the combination of structural analysis,and the limitations of the mechanism of crustal elements rotation.In the future,we should highlight the paleomagnetic works on the data-deficient area,carry out the structural application of the magnetic fabric,combine the elaborate structural analysis with paleomagnetic data,and conduct the numerical geodynamic simulation to verify the kinematics of the crustal elements in this region.

关 键 词：东北亚 大陆边缘 古地磁学 构造旋转 增生楔 洋内弧 

分 类 号：P318[天文地球—固体地球物理学] P541[天文地球—地球物理学]