青藏高原东缘岩石圈结构对现今地表垂向运动影响的数值分析

庞亚瑾, 程惠红, 张怀, 石耀霖. 2019. 青藏高原东缘岩石圈结构对现今地表垂向运动影响的数值分析. 地球物理学报, 62(4): 1256-1267, doi: 10.6038/cjg2019M0555
引用本文: 庞亚瑾, 程惠红, 张怀, 石耀霖. 2019. 青藏高原东缘岩石圈结构对现今地表垂向运动影响的数值分析. 地球物理学报, 62(4): 1256-1267, doi: 10.6038/cjg2019M0555
PANG YaJin, CHENG HuiHong, ZHANG Huai, SHI YaoLin. 2019. Numerical analysis of the influence of lithospheric structure on surface vertical movements in Eastern Tibet. Chinese Journal of Geophysics (in Chinese), 62(4): 1256-1267, doi: 10.6038/cjg2019M0555
Citation: PANG YaJin, CHENG HuiHong, ZHANG Huai, SHI YaoLin. 2019. Numerical analysis of the influence of lithospheric structure on surface vertical movements in Eastern Tibet. Chinese Journal of Geophysics (in Chinese), 62(4): 1256-1267, doi: 10.6038/cjg2019M0555

青藏高原东缘岩石圈结构对现今地表垂向运动影响的数值分析

  • 基金项目:

    国家自然科学基金(41804091),地震科技星火计划(XH19063Y),国家重点研发计划(2016YFC0600504)和中国地震局震情跟踪定向工作任务(2018010202)联合资助

详细信息
    作者简介:

    庞亚瑾, 女, 博士, 从事计算地球动力学研究.E-mail:pang.yajin@163.com

    通讯作者: 程惠红, 女, 副教授, 从事计算地球动力学研究.E-mail:chenghuihong@163.com
  • 中图分类号: P313

Numerical analysis of the influence of lithospheric structure on surface vertical movements in Eastern Tibet

More Information
  • 参考青藏高原东缘松潘-甘孜地块至四川盆地陡变地形起伏和地壳密度结构的横向差异,本文建立了二维牛顿黏性流体有限元模型,计算分析构造加载、陡变地形和重力效应控制下青藏高原东缘岩石圈变形特征,探讨横向不均匀的地壳密度结构、陡变地形和岩石圈流变性质对区域现今垂向运动的影响.计算结果显示:在构造加载作用下,松潘-甘孜地块至四川盆地地表抬升微弱.区域横向不均匀的地壳密度结构驱使松潘-甘孜地块地壳整体抬升,速率高达2 mm·a-1,四川盆地整体下沉,速率约1 mm·a-1,与龙门山两侧现今观测到的地表垂向变形模式相近.龙门山地区陡变地形驱使柔性地壳流动,调整区域地壳局部变形;岩石圈流变结构影响重力驱动作用下的模型变形量值和岩石圈变形耦合程度,松潘-甘孜地块较低的中地壳黏滞系数引起上、下地壳的变形解耦;模型较高的岩石圈地幔黏滞系数使重力驱动作用下区域垂向变形量降低.因此,青藏高原东缘地壳密度结构差异、地形起伏和岩石圈流变性质是现今区域垂向变形的重要动力学控制因素.

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  • 图 1 

    青藏高原东缘构造背景和地表形变特征

    Figure 1. 

    The geological settings and surface deformation in Eastern Tibet

    图 2 

    二维岩石圈剖面模型

    Figure 2. 

    Model setup of the 2D lithospheric profile

    图 3 

    水平构造驱动作用下模型变形分布

    Figure 3. 

    Model deformation driven by horizontal tectonic loading

    图 4 

    重力驱动作用下模型变形分布

    Figure 4. 

    Model deformation driven by gravity

    图 5 

    重力调整和构造驱动共同作用下的模型变形分布

    Figure 5. 

    Model deformation driven by horizontal tectonic loading and gravity

    图 6 

    松潘—甘孜地块中地壳流变性质对模型变形的影响

    Figure 6. 

    The influence of rheology of the middle crust in Songpan-Garzê block on model deformation

    图 7 

    岩石圈地幔流变性质对模型变形的影响

    Figure 7. 

    The influence of rheology of the lithospheric mantle on model deformation

    图 8 

    无陡变地形起伏的模型变形分布

    Figure 8. 

    The deformation of model without topographic relief

    图 9 

    龙门山周缘垂向运动速度观测值与计算值对比

    Figure 9. 

    The comparison of the observed and calculated vertical velocities

    表 1 

    计算模型参数设置

    Table 1. 

    Model parameters

    计算模型 地形
    起伏
    Moho起伏 构造
    加载
    重力
    效应
    中地壳黏滞系数
    (1020Pa·s)
    岩石圈地幔黏滞系数
    (1021Pa·s)
    Model Rt × 1.0 1.0
    Model R × 1.0 1.0
    Model Rtg 1.0 1.0
    Model 1 × 0.01 1.0
    Model 2 × 0.1 1.0
    Model 3 × 10 1.0
    Model 4 × 1.0 5.0
    Model 5 × 1.0 10.0
    Model T0 × 1.0 1.0
    下载: 导出CSV
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出版历程
收稿日期:  2018-09-15
修回日期:  2018-11-08
上线日期:  2019-04-05

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