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    三峡地区中上地壳密度结构

    张毅 陈超 梁青 王林松 杜劲松 刘圣博

    张毅, 陈超, 梁青, 王林松, 杜劲松, 刘圣博, 2012. 三峡地区中上地壳密度结构. 地球科学, 37(S1): 213-222. doi: 10.3799/dqkx.2012.S1.022
    引用本文: 张毅, 陈超, 梁青, 王林松, 杜劲松, 刘圣博, 2012. 三峡地区中上地壳密度结构. 地球科学, 37(S1): 213-222. doi: 10.3799/dqkx.2012.S1.022
    ZHANG Yi, CHEN Chao, LIANG Qing, WANG Lin-song, DU Jin-song, LIU Sheng-bo, 2012. Density Structure of Upper and Middle Crust in Three Gorges Reservoir Area. Earth Science, 37(S1): 213-222. doi: 10.3799/dqkx.2012.S1.022
    Citation: ZHANG Yi, CHEN Chao, LIANG Qing, WANG Lin-song, DU Jin-song, LIU Sheng-bo, 2012. Density Structure of Upper and Middle Crust in Three Gorges Reservoir Area. Earth Science, 37(S1): 213-222. doi: 10.3799/dqkx.2012.S1.022

    三峡地区中上地壳密度结构

    doi: 10.3799/dqkx.2012.S1.022
    基金项目: 

    科技部国际科技合作专项 2010DFA24580

    国家自然科学基金重点项目 40730317

    详细信息
      作者简介:

      张毅(1982-),男,博士,主要从事重磁数据处理、反演与解释方面的研究.E-mail: zhangyi_921@163.com

      通讯作者:

      陈超(1960-),E-mail: chenchao@cug.edu.cn

    • 中图分类号: P312.1

    Density Structure of Upper and Middle Crust in Three Gorges Reservoir Area

    • 摘要: 三峡地区处于扬子板块北缘,北部与秦岭造山带相连,西部和四川盆地相邻,东北及东南部分别为华北板块及华南褶皱带,其在历史上各种地质构造运动频繁、复杂.本文利用三维重力成像方法,得到了三峡地区中上地壳三维密度分布,结果显示黄陵背斜为高密度异常区域,其最深处大约15 km;黄陵背斜周围的主要区域性断裂构造呈菱形分布,这些断裂深度大约10~15 km,一般切割至中地壳上部,控制着该区域的构造演化过程以及大部分的地震分布;黄陵背斜中部沿长江一线有大面积低密度地层分布,推测主要为低密度物质沿雾渡河断裂侵入有关.此外,西部的秭归盆地为低密度沉积区域,其沉积厚度明显不均,自巴东向秭归方向沉积厚度明显加深.

       

    • 图  1  三峡地区地质图(据中国地质调查局,1∶2 500 000)

      Fig.  1.  Geological map in Three Gorges area

      图  2  三峡地区区域重力异常(a)和局部重力异常(b)

      其中虚线方框为反演计算区域的边界;星号处为三峡大坝所在地

      Fig.  2.  Regional gravity anomaly (a) and local gravity anomaly (b) in Three Gorges area

      图  3  三峡地区三维密度结构水平切片

      Fig.  3.  Horizontal slices of 3D density structure of Three Gorges area

      图  4  三峡地区东西向垂向剖面(31.04°N)

      ①秭归盆地;②上地壳地层;③黄陵背斜;④当阳盆地;⑤高密度地层;⑥中地壳地层;F1.新华断裂;F2.远安断裂

      Fig.  4.  East-west vertical profile of Three Gorges area

      图  5  黄陵背斜周缘主要区域性断裂分布

      ①新华断裂;②仙女山断裂;③渔阳关-土门断裂;④远安断裂;(a)为东西向垂向剖面(31.04°N);(b)为南北向垂向剖面(111.2°E)

      Fig.  5.  Main regional faults distribution around Huangling anticline

      图  6  三峡地区南北向垂向剖面(111.2°E)

      ①低密度地层;②上地壳地层;③黄陵背斜;④低密度地层;⑤远安盆地;⑥中地壳地层;F1.仙女山断裂;F2.远安断裂

      Fig.  6.  South-north vertical profile of Three Gorges area

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