磁异常揭示的峨眉山大火成岩省的深部结构

王婕, 姚长利, 李泽林. 2019. 磁异常揭示的峨眉山大火成岩省的深部结构. 地球物理学报, 62(4): 1394-1404, doi: 10.6038/cjg2019M0333
引用本文: 王婕, 姚长利, 李泽林. 2019. 磁异常揭示的峨眉山大火成岩省的深部结构. 地球物理学报, 62(4): 1394-1404, doi: 10.6038/cjg2019M0333
WANG Jie, YAO ChangLi, LI ZeLin. 2019. Deep structure in the Emeishan large igneous province revealed by inversion of magnetic anomalies. Chinese Journal of Geophysics (in Chinese), 62(4): 1394-1404, doi: 10.6038/cjg2019M0333
Citation: WANG Jie, YAO ChangLi, LI ZeLin. 2019. Deep structure in the Emeishan large igneous province revealed by inversion of magnetic anomalies. Chinese Journal of Geophysics (in Chinese), 62(4): 1394-1404, doi: 10.6038/cjg2019M0333

磁异常揭示的峨眉山大火成岩省的深部结构

  • 基金项目:

    国家高技术研究发展计划(863计划)重大项目课题(2014AA06A613)与国家自然科学基金(41574132)资助

详细信息
    作者简介:

    王婕, 主要从事磁异常的地质解译研究.E-mail:wangjie.geophysics@qq.com

    通讯作者: 姚长利, 从事重磁勘探理论与方法技术研究.E-mail:clyao@cugb.edu.cn
  • 中图分类号: P313;P631

Deep structure in the Emeishan large igneous province revealed by inversion of magnetic anomalies

More Information
  • 峨眉山大火成岩省位于中国西南部,在晚二叠纪约260 Ma喷发出巨量的大陆溢流型玄武岩.对于大火成岩省的岩浆喷发,在地下必定有一个相应的大规模岩浆聚集和运移系统.地球物理方法是探测岩石圈内部的有效方式.峨眉山大火成岩省为镁铁质岩浆喷发,由于镁铁质-超镁铁质岩石一般具有强磁性,因此,在喷发结束之后,地下岩浆系统如果被镁铁质岩浆填充,冷却固化成为岩石圈的一部分,很有可能会引起磁异常.本文使用区域磁异常数据来对峨眉山大火成岩省的深部构造进行研究.该区域的磁异常由一系列离散的异常组成,通过3D磁化率反演可以得到磁性体的空间分布.由于磁异常中具有明显的剩磁,直接使用经典的反演方法会有较大误差,我们首先将磁异常转换为弱敏感于磁化方向的磁异常模量,再使用模量数据进行3D反演,得到地下空间内磁异常源的分布.经过分析认为这些离散分布的磁异常源反映了岩石圈内部的镁铁质-超镁铁质侵入体.侵入体的位置可能反映了底侵和内侵的镁铁质岩浆固化形成的侵入体,代表镁铁质岩浆房位置或者岩浆运移的主要通道.

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  • 图 1 

    峨眉山玄武岩和同期镁铁质-超镁铁质侵入岩分布图

    Figure 1. 

    The base map shows magnetic anomalies in the Emeishan large igneous province

    图 2 

    峨眉山大火成岩省区域磁异常数据及处理转换

    Figure 2. 

    Transforms of magnetic anomaly data in the Emeishan large igneous province

    图 3 

    磁异常模量3D反演结果0~100 km不同深度切片图

    Figure 3. 

    Slices showing 3D inversion results of magnetic amplitude data at different depths from 0~100 km

    图 4 

    磁异常模量3D反演结果三维显示

    Figure 4. 

    3D display of inversion results of magnetic amplitude data

    图 5 

    磁异常模量反演推断的岩石圈内部镁铁质-超镁铁质侵入体的位置

    Figure 5. 

    Distribution of mafic-ultramafic intrusions within lithosphere revealed by magnetic 3D inversion in the Emeishan large igneous province

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出版历程
收稿日期:  2018-08-24
修回日期:  2019-02-27
上线日期:  2019-04-05

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