利用重磁异常场研究东海深部构造  

Study of the deep structure features in the East China Sea using the gravity and magnetic anomaly field

作　　者：韩波[1,2] 张训华[1,2] 田振兴[1,2] 

机构地区：[1]国土资源部海洋油气与地质环境重点实验室,青岛266071 [2]青岛海洋地质研究所,青岛266071

出　　处：《高技术通讯》2015年第5期493-499,共7页Chinese High Technology Letters

基　　金：973计划(2013CB429701);国家自然科学基金(41206050);国土资源部海洋油气资源和环境地质重点实验室基金(MRE201417)资助项目

摘　　要：基于布格重力异常数据和磁力异常数据分析,研究了东海地区的深部构造。研究表明,东海地区的布格重力异常主体有正异常背景,局部有些负值重力低圈闭,异常幅值在-160~460mGa之间变化,走向以NE,NNE向为主体走向;东海地区磁力异常主体呈异常正负交替的特征,主体走向为NE向,磁异常值在-200^+500nT之间变化。对重磁异常数据进行了向上延拓数据处理工作,去掉了浅部的异常,深部构造明显。根据重磁异常综合分析,东海深部构造自西向东依次为浙闽隆起带、东海陆架盆地、钓鱼岛隆褶带、冲绳海槽盆地、琉球隆褶带和菲律宾海盆地。The deep crustal structure in the region of the East China Sea was studied based on the analyses of the data of Bouguer gravity anomaly and magnetic anomaly. The analyses indicate that the Bouguer gravity anomaly in the region varies from -160reGal to ＋460reGal with the main trends of NE and NNE, and some lower gravity anomaly values appear in the positive anomaly background field, while the magnetic anomaly in the region varies from - 200nT to ＋ 500nT, showing the main trend of NE and the positive-negative alternation feature of the main anom- aly part. After the upward continuation treatment of the gravity anomaly and magnetic anomaly and the removal of the shallow anomaly, the deep structures in the East China Sea from west to east were obtained. They are Zhe-Min uplift zone, East China Sea shelf basin, Diaoyu Islands folded zone, Okinawa trough basin, Ryukyu uplifted fold belt, and Philippines basin.

关 键 词：东海 布格重力异常 重磁异常场 深部构造 

分 类 号：P736.1[天文地球—海洋地质]