南海北部滨海断裂带的深部结构探测现状和展望  

Current status and prospect of the deep structure exploration of the littoral fault zone in the northern South China Sea

作　　者：李志刚 张培震 惠格格 胡立天 李冠华 张逸鹏 梁浩 李琳琳 王伟涛 闫永刚 代向明 LI Zhigang;ZHANG Peizhen;HUI Gege;HU Litian;LI Guanhua;ZHANG Yipeng;LIANG Hao;LI Linlin;WANG Weitao;YAN Yonggang;DAI Xiangming(Guangdong Provincial Key Lab of Geodynamics and Geohazards/School of Earth Sciences and Engineering,Sun Yat-sen University,Zhuhai 510892,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China;School of Science,Shantou University,Shantou 515063,China)

机构地区：[1]中山大学地球科学与工程学院/广东省地球动力作用与地质灾害重点实验室,广东珠海510892 [2]南方海洋科学与工程广东省实验室(珠海),广东珠海519082 [3]汕头大学理学院,广东汕头515063

出　　处：《中山大学学报（自然科学版）（中英文）》2022年第1期55-62,共8页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：广东省引进人才创新团队项目(2016ZT06N331);国家自然科学基金(41772209,U1701641,41906049,41774049,42172233);南方海洋科学与工程广东省实验室(珠海)“南海科学考察计划”珠江口外海域地质地球物理综合科考航次(SML2020SI1002);中山大学中央高校基本科研业务费(2021qntd23);广州市科技计划项目(202102080112)。

摘　　要：南海北部滨海断裂带不仅是华南次级板块和南海次级板块的分界断裂,同时是南海北部陆缘区域的主要控震和孕震构造,也是珠江口盆地新生代含油气盆地的控盆断裂,因此,厘清其深部地壳结构、构造演化和最新活动性,对理解南海北部陆缘的构造和含油气盆地演化过程、动力学机制以及地震灾害评估等具有重要意义。由于特殊的构造位置及研究的重要性,不同学者对其开展过大量地球物理探测工作,极大地提升了对该断裂带的认识。本文总结了滨海断裂带深部结构探测、构造属性、活动性和孕震构造等方面的研究进展及基本认识,阐明了该断裂带的深部地壳结构和活动特征存在分段性,指出了该断裂带与NW向断裂带和上地壳低速层三者结合位置为区域强震发生提供了深部动力学环境。加强不同位置的深-浅结构和海底变形综合探测研究,结合周边区域已知的地质学、地球物理学和地震学数据,解决滨海断裂带的深-浅构造耦合及其与NW向断裂带之间关系问题,探讨其最新活动性与地震-海啸灾害的关系,可能是滨海断裂带未来研究的重点和方向。The littoral fault zone(LFZ)in the northern South China Sea,is an important boundary fault between South China sub-plate and South China Sea sub-plate,is the seismogenic structure in the northern continental margin,and acts as a basin-controlling fault in the Pearl River Mouth Basin.Studies on the deeper crustal structures,structural evolution,and the latest activities of the LFZ have great significance in understanding the structural architecture and geodynamic processes,and in seismic hazard assessment.We review the deep structure exploration,tectonic attributes,activities,and seismogenic structure of the LFZ.Based on these,we propose that the LFZ is segmented concerning the deeper crustal structures and active characteristics;moreover,it has the potential of strong earthquakes when all three components of the LFZ,a NW-striking fault,and a low-velocity layer meet together.Finally,we highlight the problems to be solved in the future about the LFS,including the coupling of the deep and shallow structures,the relationship with the intersected NW-striking faults,the latest activities,and the assessment of earthquake-tsunami disasters.

关 键 词：南海北部 滨海断裂带 地球物理探测 最新活动性 发震构造 

分 类 号：P54[天文地球—构造地质学] P67[天文地球—地质学]