海洋学研究 ›› 2022, Vol. 40 ›› Issue (2): 42-52.DOI: 10.3969-j.issn.1001-909X.2022.02.005

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海洋大地电磁揭示了西太平洋苏达海山的电阻率结构

  

  1. 1.山东科技大学测绘与空间信息学院，山东 青岛266000；
    2.自然资源部第二海洋研究所，浙江 杭州 310012； 3.自然资源部海底科学重点实验室，浙江 杭州 310012
  • 出版日期:2022-06-15 发布日期:2022-06-15

Marine magnetotelluric reveals the resistivity structure of the Suda Seamount in the western Pacific Ocean

  1. 1.College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266000, China; 2.Second Institute of Oceanography, MNR, Hangzhou 310012, China; 3.Key Laboratory of Submarine Geosciences, MNR, Hangzhou 310012, China
  • Online:2022-06-15 Published:2022-06-15

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摘要： 为了研究海洋板块内火山的深部电阻率结构及其形成过程，在西太平洋苏达海山进行了海洋大地电磁测量。采用主流数据处理方法SSMT2000进行数据处理，分别对旋转后的实测数据以及根据实测数据得到的两组旋转不变量数据进行一维结构假设下的大地电磁响应测试，对响应最好的YX方向数据进行一维反演，并结合一维正演、地质资料对反演结果进行综合解释。反演结果表明，苏达海山区域地壳厚度为21.5 km左右；较厚的火山碎屑岩层表明苏达海山的构建过程以喷发性的岩浆活动为主，其侵入性的岩浆活动较弱。

关键词: 海洋大地电磁测量, 一维正、反演, 板内海山, 地壳结构

Abstract: In order to study the deep resistivity structure of intraplate volcanoes and their formation processes, a marine magnetotelluric survey at Suda Seamount in the western Pacific Ocean was conducted. The mainstream data processing method SSMT2000 was used for data processing. The measured data after rotation and the two groups of rotation invariants obtained from the measured data were tested for magnetotelluric response under the assumption of one-dimensional structure, and one-dimensional inversion was conducted for the YX direction data with the best response. Combined with one-dimensional forward modeling and other geological data, the inversion results were comprehensively interpreted. The inversion results show that the thickness of the crust at Suda Seamount is about 21.5 km. The thick volcanic clastic rocks indicate that the formation of Suda Seamount is mainly eruptive and weakly intrusive.

Key words: marine magnetotelluric survey, onedimensional forward and inversion, intraplate volcanoes, crustal structure

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