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    菲律宾海四国海盆地壳结构重力反演及其形成演化过程分析

    李赫 唐勇 丁巍伟 方银霞 董崇志 程子华

    李赫, 唐勇, 丁巍伟, 方银霞, 董崇志, 程子华, 2018. 菲律宾海四国海盆地壳结构重力反演及其形成演化过程分析. 地球科学, 43(3): 862-872. doi: 10.3799/dqkx.2017.505
    引用本文: 李赫, 唐勇, 丁巍伟, 方银霞, 董崇志, 程子华, 2018. 菲律宾海四国海盆地壳结构重力反演及其形成演化过程分析. 地球科学, 43(3): 862-872. doi: 10.3799/dqkx.2017.505
    Li He, Tang Yong, Ding Weiwei, Fang Yinxia, Dong Chongzhi, Cheng Zihua, 2018. Gravity Inversion on Crust Structures of the Shikoku Basin, Philippine Sea, and Its Implication to the Evolution Process. Earth Science, 43(3): 862-872. doi: 10.3799/dqkx.2017.505
    Citation: Li He, Tang Yong, Ding Weiwei, Fang Yinxia, Dong Chongzhi, Cheng Zihua, 2018. Gravity Inversion on Crust Structures of the Shikoku Basin, Philippine Sea, and Its Implication to the Evolution Process. Earth Science, 43(3): 862-872. doi: 10.3799/dqkx.2017.505

    菲律宾海四国海盆地壳结构重力反演及其形成演化过程分析

    doi: 10.3799/dqkx.2017.505
    基金项目: 

    国家海洋局第二海洋研究所基本科研业务费专项 JT1306

    国家海洋公益性行业科研专项 201205003

    国家重点研发计划 2016YF060402

    国家自然科学基金项目 41476048

    全球变化与海气相互作用专项 GASI-GEOGE-01

    详细信息
      作者简介:

      李赫(1992-), 男, 硕士研究生, 主要从事海洋地球物理与海底动力演化研究

      通讯作者:

      唐勇

    • 中图分类号: P631.1

    Gravity Inversion on Crust Structures of the Shikoku Basin, Philippine Sea, and Its Implication to the Evolution Process

    • 摘要: 四国海盆是位于菲律宾海板块内由岛弧张裂形成的弧后盆地,其深部地壳结构对认识伊豆小笠原岛弧的裂解和弧后盆地的扩张过程有重要的意义.在反射多道地震剖面和深部海底地震(OBS)探测剖面的约束下,结合磁异常条带数据,利用两条横穿四国海盆的重力测线数据对海盆的地壳物性结构反演,对比重力反演剖面与深部探测剖面地壳厚度和密度特征,得到更加精细的四国海盆地壳结构.研究结果显示,四国海盆洋壳厚度自西向东逐渐增厚,在残留扩张脊处莫霍面深度迅速增加.根据地壳密度和厚度将四国海盆分为:洋壳减薄区、洋壳增厚区、后扩张洋壳增生区,分别对应初始慢速张裂、单翼快速扩张、对称慢速扩张3期扩张活动.南北测线不同构造分区得到的扩张速率与由磁异常条带得到扩张速率相同;洋壳减薄区下地壳均有高密度体,与OBS剖面中下地壳高速体相对应,可能是由于洋壳慢速扩张过程中强烈拆离作用,地幔蛇纹石化导致.

       

    • 图  1  研究区位置以及地球物理探测剖面分布

      红线部分:两条重力反演线位置;背景是地形图

      Fig.  1.  Location of the study area and the distribution of geophysical exploration profiles in the Shikoku basin

      图  2  四国海盆空间重力异常

      Fig.  2.  Free-air gravity anomaly map of the Shikoku basin

      图  3  四国海盆磁异常

      Okino et al.(1999)

      Fig.  3.  Magnetic anomaly map of the Shikoku basin

      图  4  四国海盆南部密度D(g/cm3)模型剖面(剖面AA')

      Fig.  4.  Vertical cross section of density (g/cm3) model through the southern Shikoku basin

      图  5  四国海盆北部密度D(g/cm3)模型剖面(剖面BB')

      Fig.  5.  Vertical cross section of density (g/cm3) model through the northern Shikoku basin

      图  6  四国海盆OBS速度剖面与密度D(g/cm3)模型地壳结构对比

      图中黑色线为OBS探测的莫霍面,白色线为洋壳层2、层3分界面

      Fig.  6.  Comparison of crustal structure between refraction seismic velocity model and density model in the Shikoku basin

      表  1  反演建模采用的密度参数

      Table  1.   Densities used in the modeling

      模型块体 海水 新生代沉积 大洋层1 大洋层2 大洋层3 海山 岩浆侵入体 上地壳 中地壳 下地壳
      密度(g/cm3) 1.03 1.96~2.30 1.96~2.30 2.38~2.81 2.81~3.05 2.50~2.69 2.54~2.62 2.40~2.70 2.69~2.78 2.80~2.95
      下载: 导出CSV

      表  2  迭代拟合反演密度

      Table  2.   Densities from iterative inversion

      模型块体 海水 新生代沉积 大洋层1 大洋层2 大洋层3 海山 岩浆侵入体 上地壳 中地壳 下地壳
      密度(g/cm3) 1.03 1.96~2.30 1.96~2.30 2.38~2.81 2.81~3.05 2.50~2.69 2.54~2.62 2.40~2.70 2.69~2.78 2.80~2.95
      下载: 导出CSV
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