利用重磁资料研究北极地区格陵兰-冰岛-法罗脊构造特征  

Structure of Greenland-Iceland-Faroe Ridge revealed in gravity and magnetic anomalies

作　　者：赵敏 张春灌[1,2] 袁炳强 张冕[1,2] 韩梅 周磊[1,2] ZHAO Min;ZHANG Chunguan;YUAN Bingqiang;ZHANG Mian;HAN Mei;ZHOU Lei(School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an 710065,China;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院,西安710065 [2]西安石油大学陕西省油气成藏地质学重点实验室,西安710065

出　　处：《海洋地质前沿》2024年第8期88-95,共8页Marine Geology Frontiers

基　　金：国家自然科学基金(42172224);陕西省自然科学基础研究计划项目(2021JM-401)。

摘　　要：为了深入研究北极地区格陵兰-冰岛-法罗脊及邻区的重磁场及构造特征,系统分析与整理了全球重力数据库V29数据、船测重力异常数据、全球地磁异常网格第3版数据以及航空磁测数据。利用变纬度化磁极方法得到磁力化极异常,进而利用位场边缘识别方法进行位场边缘识别,基于滑动平均法计算自由空间重力和磁力化极局部异常。结合已有的研究成果,深入分析格陵兰-冰岛-法罗脊及邻区的区域断裂构造格架,识别了7组主要断裂。这7组断裂在控制隆坳格架、基底结构与性质方面发挥了重要作用。基于这些主要断裂,划分了格陵兰板块、Kolbeinsey脊、扬马延微陆块、东扬马延深海盆地、格陵兰-冰岛-法罗复杂构造带、Rekjanes脊、Aegir脊和法罗-梅恩兰构造带共8个构造单元,为北极地区的地质勘探提供地质及地球物理资料。To study the gravity and magnetic field and tectonic features of the Greenland-Iceland-Faroe Ridge and adjacent areas in the Arctic region,the data from the Global Gravity Database V29,ship gravity anomaly,the third edition of the Earth Magnetic Anomaly Grid at 2 Arc Minute Resolution Version 3,and Aviation Magnetic Measurement were collected and analyzed.The magnetic anomaly by reduction to the pole was obtained by variable latitude polarization,and then the potential field edge was recognized.The free-air gravity anomaly and magnetization poles local anomalies were calculated based on the sliding average method.Combined with available studies,the features of the regional fault structure framework of the Greenland-Iceland-Faroe Ridge and adjacent areas were analyzed and 7 major faults were identified.These faults have played an important role in controlling the uplift framework,basement structure and the properties.Based on the major faults,8 regional tectonic units were divided,including the Greenland Plate,the Kolbeinsey ridge,the Jan Mayen microcontinent,the east Jan Mayen deep sea basin,the Greenland-Iceland-Faroe complex structural belt,the Rekjanes ridge,the Aegir ridge,and the Faroe-Mainland tectonic belt,providing the geological and geophysical data for future geological exploration in the Arctic region.

关 键 词：北极地区 格陵兰-冰岛-法罗脊 重磁异常 断裂 

分 类 号：P736.12[天文地球—海洋地质] P548[天文地球—海洋科学]