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    板块俯冲带水流体活动及其效应的定量化数值模拟

    李忠海 杨舒婷 刘明启 皇甫鹏鹏

    李忠海, 杨舒婷, 刘明启, 皇甫鹏鹏, 2019. 板块俯冲带水流体活动及其效应的定量化数值模拟. 地球科学, 44(12): 3984-3992. doi: 10.3799/dqkx.2019.232
    引用本文: 李忠海, 杨舒婷, 刘明启, 皇甫鹏鹏, 2019. 板块俯冲带水流体活动及其效应的定量化数值模拟. 地球科学, 44(12): 3984-3992. doi: 10.3799/dqkx.2019.232
    Li Zhonghai, Yang Shuting, Liu Mingqi, Huangfu Pengpeng, 2019. Aqueous Fluid Activity and Its Effects in the Subduction Zones: A Systematic Numerical Modeling Study. Earth Science, 44(12): 3984-3992. doi: 10.3799/dqkx.2019.232
    Citation: Li Zhonghai, Yang Shuting, Liu Mingqi, Huangfu Pengpeng, 2019. Aqueous Fluid Activity and Its Effects in the Subduction Zones: A Systematic Numerical Modeling Study. Earth Science, 44(12): 3984-3992. doi: 10.3799/dqkx.2019.232

    板块俯冲带水流体活动及其效应的定量化数值模拟

    doi: 10.3799/dqkx.2019.232
    基金项目: 

    科技部“973”项目 2015CB856106

    详细信息
      作者简介:

      李忠海(1982-), 男, 教授, 博士生导师, 主攻地球动力学数值模拟方向, 以理论计算和软件程序开发为基础, 以大尺度数值模拟为主要手段, 以板块俯冲-碰撞带及其相关动力学过程为研究对象

    • 中图分类号: P31

    Aqueous Fluid Activity and Its Effects in the Subduction Zones: A Systematic Numerical Modeling Study

    • 摘要: 为探讨水流体活动对板块俯冲隧道过程及大陆碰撞造山的制约作用,采用热力学和动力学耦合的数值模拟方法,建立了系统的数值模型.结果显示俯冲隧道内的混杂岩存在两种不同的折返路径:(1)平行于俯冲隧道斜向上折返,形成靠近缝合带的高压-超高压变质岩;(2)近垂直穿过上覆地幔楔侵入地壳深度.这两种差异性的模式主要受控于俯冲带热结构.俯冲带的温度结构控制俯冲隧道内水流体和熔体活动,从而影响上覆地幔楔的弱化程度,最终导致俯冲带内物质的不同运移过程和折返路径.同时,大陆俯冲碰撞带的岩石圈变形和拆沉作用均与俯冲带的流体-熔体活动所导致的岩石圈弱化息息相关.数值模拟结果极大促进了对于板块俯冲带流体-熔体活动及其动力学过程的理解.

       

    • 图  1  俯冲带含水流体活动的物质场演化数值模型

      颜色代表岩石类型.模型的演化时间如图左下角所示(修改自李忠海等,2015)

      Fig.  1.  Composition evolution of the numerical model with fluid-melt activity in the subduction zones

      图  2  会聚板块年龄或厚度对俯冲带温度结构的制约

      a.参考模型演化至10 Ma时,温度场分布(俯冲大洋岩石圈年龄为tAo=60 Ma,上覆大陆岩石圈厚度为Tc=140 km,俯冲速率为Vx=5 cm/a);黑色垂线b~e代表温度剖面位置.b、c.保持Tc=140 km和Vx=5 cm/a不变,不同年龄大洋岩石圈模型俯冲至10 Ma时,黑线b、c(x=2 720 km,2 840 km)位置对应的温度结构.d、e保持tAo=60 Ma和Vx=5 cm/a不变,不同上覆大陆岩石圈厚度模型演化至10 Ma时,黑线d、e(x=2 700 km,2 900 km)位置对应的温度结构.图修改自Liu et al.(2017)

      Fig.  2.  The constraints of age or thickness of convergent plates on the temperature structure of subduction zones

      图  3  俯冲带物质折返模式相

      修改自Liu et al.(2017)

      Fig.  3.  Regime diagram of material exhumation in the subduction zones

      图  4  岩石圈弱化程度对大陆俯冲碰撞模式的制约

      修改自Li et al.(2016);模型A和B的上覆岩石圈地幔采用干橄榄岩的流变强度,而模型C和D的上覆岩石圈地幔采用湿橄榄岩的流变强度(Ranalli,1995)

      Fig.  4.  Constraints of lithospheric weakening on the continental subduction and collision

      图  5  阿尔卑斯-喜马拉雅构造域内三个典型造山带区域地质简图及壳幔结构示意

      区域主要构造线及构造单元(从西至东):EAF.东安纳托利亚断裂;NAF.北安纳托利亚断裂;NEAF.北东安纳托里利亚断裂;BS.Bitlis缝合带;ZFTB.扎格罗斯褶皱冲断带;HZ.高扎格罗斯;SSZ.Sanandaj-Sirjan区域;UDMA.Urumieh-Dokhtar岩浆弧;CIP.中部伊朗高原;MBT.主边界断裂;MCT.主中央断裂;STDS.藏南拆离系;ITS.雅江缝合带;BNS.斑怒缝合带;JS.金沙江缝合带;KF.喀喇昆仑断裂;修改自Huangfu et al.(2019)

      Fig.  5.  Major tectonic units and simplified crustal-lithospheric structure of three collisional orogenies within the Alpine-Himalayan belt

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    • 收稿日期:  2019-08-09
    • 刊出日期:  2019-12-15

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