西太平洋卡罗琳洋底高原俯冲系统的构造特征与钻探建议  

Tectonic evolution and drilling proposal of the subduction system of the Caroline Ridge-An oceanic plateau in the Western Pacific

作　　者：董冬冬[1,2,3] 张正一 范建柯[1,2,3] 李翠琳 张广旭[1,2,4] 杨柳 DONG Dongdong;ZHANG Zhengyi;FAN Jianke;LI Cuilin;ZHANG Guangxu;YANG Liu(Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China;Laboratory for Marine Geology,Pilot National Laboratory for Marine Science and Technology,Qingdao 266237,China;Laboratory for Marine Mineral Resources,Pilot National Laboratory for Marine Science and Technology,Qingdao 266237,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院海洋研究所,海洋地质与环境重点实验室,青岛266071 [2]中国科学院海洋大科学研究中心,青岛266071 [3]青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室,青岛266237 [4]青岛海洋科学与技术试点国家实验室海洋矿床资源评价与探测技术功能实验室,青岛266237 [5]中国科学院大学,北京100049

出　　处：《海洋地质与第四纪地质》2022年第5期178-186,共9页Marine Geology & Quaternary Geology

基　　金：中国科学院战略性先导科技专项(B类)(XDB42000000);中国科学院海洋大科学研究中心重点部署项目(COMS2019Q10);青岛海洋科学与技术试点国家实验室山东省专项经费(2022QNLM05032);国家自然科学基金项目“马里亚纳-雅浦俯冲带壳幔横波速度结构与方位各向异性研究”(41976052);“极慢速汇聚板块边缘雅浦俯冲带俯冲侵蚀动力学的数值模拟研究”(42106064);“索罗尔海槽的地壳结构、演化及对加罗林洋底高原裂解的构造指示”(41976051)。

摘　　要：洋底高原的形成与演化过程是近年来海洋地质学关注的重点科学问题之一。卡罗琳洋底高原位于西太平洋雅浦海域,其构造演化独具特色,经历了热点火山作用、俯冲碰撞和裂解等多个地质事件,为洋底高原的研究提供了关键案例。目前对卡罗琳洋底高原演化过程的认识尚未完全明晰,未来研究可聚焦4个方面:(1)卡罗琳洋底高原北部正常洋壳年龄的厘定,揭示卡罗琳板块-太平洋板块边界的位置与形态;(2)结合钻井、地震地层学研究,建立地层年代框架,识别区域构造事件的发生时间与影响范围;(3)揭示索罗尔海槽岩石圈的张裂阶段及新洋壳是否形成;(4)阐明卡罗琳洋底高原俯冲前缘挠曲断裂带地壳的性质与年龄。近年来,我国十分重视卡罗琳海域的地质和地球物理调查研究,并有望开展大洋钻探计划。本文在前期工作的基础上提出了雅浦海域大洋钻探站位选取建议,希望可以解决以上关键科学问题,为全球洋底高原的形成演化研究贡献中国智慧。The formation and evolution of oceanic plateaus have been the focus of marine geology in recent years.The Caroline Plateau,also known as Caroline Ridge,near the Yap Trench in the western Pacific,is unique in tectonic evolution.It experienced from hotspot volcanism,subduction,collision,to rifting,and provided a key case for the study of oceanic plateaus.At present,the understanding of the evolutionary process of the Caroline Plateau is not completely clear.Future research shall focus on:(1) determining the age of the normal oceanic crust in the northern Caroline Plateau,and revealing the location and shape of the Caroline-Pacific plate boundary;(2) establishing stratigraphic time frame based on seismic stratigraphy in combination with drilling,and identifying the occurrence time and influence scope of regional events;(3) revealing the rifting stage and the possibility of oceanic crust formation in the Sorol Trough;(4) clarifying the nature and age of the crust in the bending-related fault zone in the incoming Caroline Plateau front.In recent years,geological and geophysical features of the Caroline plate are highly focused in China,and it is expected to carry out an ocean drilling program.On the basis of previous works,we proposed ocean drilling sites in the Caroline sea.

关 键 词：洋底高原 板块边界 大洋钻探 地球物理 索罗尔海槽 雅浦海沟 

分 类 号：P736[天文地球—海洋地质]