基于航磁资料解释的珠江三角洲地区深部断裂  

Deep faults in the Pearl River Delta region based on aeromagnetic data interpretation

作　　者：毕丽思[1,2] 黄剑涛 任镇寰[1] 叶秀薇 卢帮华[1,2] 刘天佑[4] 乔计花[5] BI Lisi;HUANG Jiantao;REN Zhenhuan;YE Xiuwei;LU Banghua;LIU Tianyou;QIAO Jihua(Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology,Guangdong Earthquake Administration,Guangzhou 510070,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519080,China;Shenzhen Academy of Disaster Prevention and Reduction,China Earthquake Administration,Shenzhen 518003,China;Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China;Development Research Center of China Geological Survey,Beijing 100083,China)

机构地区：[1]广东省地震局地震监测与减灾技术重点实验室,广东广州510070 [2]南方海洋科学与工程广东省实验室(珠海),广东珠海519080 [3]中国地震局深圳防震减灾技术研究院,广东深圳518003 [4]中国地质大学地球物理与空间信息学院,湖北武汉430074 [5]中国地质调查局发展研究中心,北京100083

出　　处：《中山大学学报（自然科学版）（中英文）》2021年第4期90-99,共10页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学-广东联合基金(U1901602);南方海洋科学与工程广东省实验室(珠海)基金(99147-42080024)。

摘　　要：珠江三角洲地区航磁异常场具有明显的分区性,并且在以近EW向为主体的磁场背景下,同时存在NE、NW向磁场体。经过对其航磁资料进行系统处理、分析、解释,确认珠江三角洲地区地壳深部存在近EW向、NW向、NE向三组断裂系。近EW向断裂是主要断裂,大部分深及30 km以上。NW向断裂较发育,但切割深度较浅,大部分在10 km左右。NE向断裂的切割深度亦不大,特别是一些以往被称为是深部断裂者大多数只有10 km左右,不超过20 km。三组断裂间相互切割,但近EW向与NW向断裂活动性较强、活动时代较新。这些成果与重力资料系统处理结果基本一致,与传统认识的珠江三角洲地区深部断裂格局则有较大改变。最后,本文提出"新构造期深部断裂"的新概念和理论。The aeromagnetic anomalies in the Pearl River Delta region show noticeable zones,which present a background of EW-direction zones and also exist aeromagnetic fields of NE and NW directions.By processing,analyzing and interpreting the aeromagnetic data,it is confirmed that three sets of faults,i. e.,the EW-,NW-and NE-direction faults,constitute the framework of deep faulting system of the Pearl River Delta region. The EW-trending faults are major faults and most of them reach the depth over 30 km. The NW-trending ones are well-developed in the delta,but their depths are merely around 10 km. The NE-trending faults are also shallow;the depths of some NE faults,which are considered with a depth over 30 km previously,are about 10 km and definitely less than 20 km according to our interpretation. The three sets of faults are intersected each other;the EW and NW faults are more active than the NE ones,and their activity ages are newer as well. These results are agreement with those obtained from gravity data of the area,but different largely from the traditional cognizance of the deep fault structure of the Pearl River Delta region. A new concept of neotectonic stage of deep faults is proposed to explain these features.

关 键 词：珠江三角洲地区 航磁异常 深部断裂 新构造期 

分 类 号：P631.222[天文地球—地质矿产勘探] P627[天文地球—地质学]