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    广西地区岩石圈表层与深部构造之关联性:源于岩石圈密度与磁性结构的解读

    黎海龙 胡正旺 杜劲松 涂晨鸣 支剑丽 刘鹏宇 梁青 陈超

    黎海龙, 胡正旺, 杜劲松, 涂晨鸣, 支剑丽, 刘鹏宇, 梁青, 陈超, 2022. 广西地区岩石圈表层与深部构造之关联性:源于岩石圈密度与磁性结构的解读. 地球科学, 47(4): 1507-1516. doi: 10.3799/dqkx.2021.025
    引用本文: 黎海龙, 胡正旺, 杜劲松, 涂晨鸣, 支剑丽, 刘鹏宇, 梁青, 陈超, 2022. 广西地区岩石圈表层与深部构造之关联性:源于岩石圈密度与磁性结构的解读. 地球科学, 47(4): 1507-1516. doi: 10.3799/dqkx.2021.025
    Li Hailong, Hu Zhengwang, Du Jinsong, Tu Chenming, Zhi Jianli, Liu Pengyu, Liang Qing, Chen Chao, 2022. Tectonic Relationship between Upper and Lower Lithosphere in Guangxi Area: A Comprehension from Lithospheric Density and Magnetic Structures. Earth Science, 47(4): 1507-1516. doi: 10.3799/dqkx.2021.025
    Citation: Li Hailong, Hu Zhengwang, Du Jinsong, Tu Chenming, Zhi Jianli, Liu Pengyu, Liang Qing, Chen Chao, 2022. Tectonic Relationship between Upper and Lower Lithosphere in Guangxi Area: A Comprehension from Lithospheric Density and Magnetic Structures. Earth Science, 47(4): 1507-1516. doi: 10.3799/dqkx.2021.025

    广西地区岩石圈表层与深部构造之关联性:源于岩石圈密度与磁性结构的解读

    doi: 10.3799/dqkx.2021.025
    基金项目: 

    国家自然科学基金项目 41774091

    中国地质调查局地质调查项目 DD20179607

    中国地质调查局地质调查项目 DD20160060

    详细信息
      作者简介:

      黎海龙(1970-),男,博士研究生,主要从事地球物理勘查、区域构造与矿产勘查及相关技术工作.E-mail:252296049@qq.com

      通讯作者:

      胡正旺,ORCID: 0000-0003-2932-9320,E-mail: hzw@cug.edu.cn

    • 中图分类号: P581

    Tectonic Relationship between Upper and Lower Lithosphere in Guangxi Area: A Comprehension from Lithospheric Density and Magnetic Structures

    • 摘要: 广西地处华南地块、印支地块与西太平洋板块的汇合部位,因特殊的构造部位,广西区内大地构造单元归属、构造单元边界等许多基础地质问题一直存在争议.自新生代以来的板块构造运动对岩石圈的改造,广西地壳与上地幔在地震波速度及温度结构方面具有显著差异.应用卫星重、磁异常数据以及区域重力和航磁资料对广西地区岩石圈密度和磁化率结构及其与上地壳构造的关系开展了研究,结果显示广西地区地壳密度和上地壳磁性结构与现今地表构造较为契合,但下地壳密度结构与上地幔存在不连续现象;此外,岩石圈磁化率结构指示中下地壳存在不同范围和程度的解耦.对广西岩石圈密度与磁性结构的解读认为,在中生代以来岩石圈被大规模改造的背景下,幔源物质上侵至上地壳的规模和范围都有限,这可能是整个广西地区上地幔结构与地壳构造不对应的主要原因.

       

    • 图  1  广西及邻区卫星重、磁异常及主要区域断裂构造

      a.卫星(布格)重力异常;b.卫星重力异常垂直导数;c.卫星磁异常;d.广西区域断裂构造分布图(根据新版广西区域地质志:广西主要区域断裂构造简图汇编),图中红色虚线为推断深大断裂. 图中所列区域断裂分别为:①南丹-昆仑关断裂带;②凭祥-大黎断裂带;③右江断裂带;④峒中-小董断裂带;⑤宜州-柳城断裂带;⑥田林-八马隐伏断裂带;⑦博白-梧州断裂带;⑧桂林-来宾断裂带;⑨那坡断裂带;⑩灵山-藤县断裂带;⑪黑水河断裂带;⑫下雷-灵马断裂带;⑬陆川-岑溪断裂带;⑭栗木-马江断裂带;⑮上思-在妙断裂带;⑯池洞-摩天岭断裂带;⑰和睦-老堡断裂带;⑱资源-溶江断裂带

      Fig.  1.  Satellite gravity and magnetic anomalies and main regional faults

      图  2  广西及邻区上地幔密度与横波波速异常(δVs)

      图a,b和c分别为利用卫星重力异常反演得到的不同深度上地幔密度异常;图d,e和f为对应深度上地幔横波波速异常(数据取自SL2013sv模型)

      Fig.  2.  Density and shear wave velocity vs. anomalies beneath the Guangxi and its surrounding regions

      图  3  广西地区岩石圈不同深度的密度异常

      图中红色线段为主要区域断裂,虚线段为推测的深大断裂

      Fig.  3.  Density anomalies of the lithosphere in different depths in Guangxi region

      图  4  广西地区岩石圈不同深度的磁化率异常及估算的居里面深度(CPD数据源于Zhi et al., 2018)

      图中红色线段为主要区域断裂,黑色线段为垂向切片剖面位置

      Fig.  4.  Magnetic susceptibility anomalies of the lithosphere in different depths and the estimated depth of Curie point depth (CPD) in Guangxi region (CPD data from Zhi et al., 2018)

      图  5  反演的岩石圈磁化率异常剖面

      图a~d分别为图 4iAA',BB',CC'和DD'剖面上的磁化率异常分布

      Fig.  5.  Inverted magnetic susceptibility anomalies of the lithosphere in sections

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    • 收稿日期:  2021-02-27
    • 网络出版日期:  2022-04-29
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