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    长江中下游成矿带深部结构层析成像图像揭示华北板块的东南向俯冲

    郑洪伟 李廷栋 贺日政

    郑洪伟, 李廷栋, 贺日政, 2020. 长江中下游成矿带深部结构层析成像图像揭示华北板块的东南向俯冲. 地球科学, 45(11): 4187-4197. doi: 10.3799/dqkx.2020.053
    引用本文: 郑洪伟, 李廷栋, 贺日政, 2020. 长江中下游成矿带深部结构层析成像图像揭示华北板块的东南向俯冲. 地球科学, 45(11): 4187-4197. doi: 10.3799/dqkx.2020.053
    Zheng Hongwei, Li Tingdong, He Rizheng, 2020. Southeastward Subduction of North China Block: Insights from Tomographyic Image of the Middle and Lower Yangtze River Metallogenic Belt. Earth Science, 45(11): 4187-4197. doi: 10.3799/dqkx.2020.053
    Citation: Zheng Hongwei, Li Tingdong, He Rizheng, 2020. Southeastward Subduction of North China Block: Insights from Tomographyic Image of the Middle and Lower Yangtze River Metallogenic Belt. Earth Science, 45(11): 4187-4197. doi: 10.3799/dqkx.2020.053

    长江中下游成矿带深部结构层析成像图像揭示华北板块的东南向俯冲

    doi: 10.3799/dqkx.2020.053
    基金项目: 

    上海佘山地球物理国家野外科学观测研究站开放基金项目 2020K07

    国家重点研发计划项目 2016YFC0600301

    中国地质调查项目 DD20190448

    中国地质调查项目 DD20190370

    国家自然科学基金项目 41374101

    详细信息
      作者简介:

      郑洪伟(1977-), 女, 副研究员, 博士, 主要从事地震层析成像研究.ORCID:0000-0002-1668-5230.E-mail:zhenghongwei004@sina.com

      通讯作者:

      贺日政, E-mail:herizheng@cags.ac.cn

    • 中图分类号: P3

    Southeastward Subduction of North China Block: Insights from Tomographyic Image of the Middle and Lower Yangtze River Metallogenic Belt

    • 摘要: 远震层析成像结果所揭示的华北板块东南向俯冲到扬子板块之下对于重新认识长江中下游地区成矿机制具有重要意义.利用来自中国地震台网中心,包括湖北、河南、安徽、江西、浙江、江苏等省级地震台网记录的波形数据对长江中下游地区深部结构进行了远震P波层析成像反演.综合研究结果显示,三叠纪华北与扬子板块俯冲碰撞,华北板块越过郯庐断裂带,向东南俯冲到扬子板块之下.推断板块碰撞的深部缝合线在郯庐断裂带以西位于大别造山带以南,在郯庐断裂带以东位于长江一线.经历后期的中生代构造转换过程,该带发生活化,成为中生代含矿岩浆和流体上升的通道,并形成著名的大型成矿带.

       

    • 图  1  长江中下游成矿带地区构造简图

      宋传中等(2011).蓝色的圆点为矿床点.LAF.六安断裂;XGF.襄樊-广济断裂;TLF.郯庐断裂

      Fig.  1.  Sketch map showing the tectonics and distribution of major ore concentration areas in the Mid-Lower reaches of Yangtze River

      图  2  长江中下游地区台站分布

      Fig.  2.  Distribution of the seismic stations used in this study

      图  3  使用的震级大于5.0的地震震中分布

      Fig.  3.  Epicentral locations of the local seismic events

      图  4  地震射线分布

      Fig.  4.  Distibution of the ray paths

      图  5  网格划分为0.5°×0.5°格点图

      Fig.  5.  Grid model map of 0.5°×0.5°

      图  6  反演所使用的一维P波速度模型

      Huang and Zhao(2004)

      Fig.  6.  The reference one-dimensional Vp model

      图  7  速度扰动变化与走时残差均方根之间的Trade-off曲线

      Fig.  7.  Trade-off curve for the root-mean-square (RMS) travel-time residuals versus RMS of P-wave velocity perturbations at the grid nodes

      图  8  不同深度水平切片的Checkerboard分辨率检测结果

      Fig.  8.  Results of a Checkerboard resolution test

      图  9  长江中下游成矿带地区不同深度水平剖面速度结构异常图

      每层深度值标注在图的右下角,速度扰动色标在图件下方

      Fig.  9.  Plan views of P-wave velocity images of the Mid-Lower reaches of Yangtze River at each depth

      图  10  长江中下游地区沿不同经纬度方向的层析成像剖面

      右下图为剖面所在位置.黑虚线标出了华北板块高速体范围.断裂构造参加图 1

      Fig.  10.  Vertical cross-sections of P-wave tomography along the profiles shown on the lower-right panel. Black dashed lines show the range of the NCB velocity anomalies. The tectonic lines are the same as the Fig. 1

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    出版历程
    • 收稿日期:  2020-03-17
    • 刊出日期:  2020-11-15

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