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大巴山前陆带东段神农架地区构造变形研究

李建华 张岳桥 施炜 李海龙 董树文

李建华, 张岳桥, 施炜, 等, 2009. 大巴山前陆带东段神农架地区构造变形研究. 地质力学学报, 15 (2): 162-177.
引用本文: 李建华, 张岳桥, 施炜, 等, 2009. 大巴山前陆带东段神农架地区构造变形研究. 地质力学学报, 15 (2): 162-177.
LI Jian-hua, ZHANG Yue-qiao, SHI Wei, et al., 2009. TECTONIC DEFORMATION FEATURES OF SHENNONGJIA REGION IN EASTERN DABASHAN FORELAND STRUCTURAL BELT. Journal of Geomechanics, 15 (2): 162-177.
Citation: LI Jian-hua, ZHANG Yue-qiao, SHI Wei, et al., 2009. TECTONIC DEFORMATION FEATURES OF SHENNONGJIA REGION IN EASTERN DABASHAN FORELAND STRUCTURAL BELT. Journal of Geomechanics, 15 (2): 162-177.

大巴山前陆带东段神农架地区构造变形研究

基金项目: 

中国地质科学院地质力学研究所基本科研项目 DZLXJK200715

详细信息
    作者简介:

    李建华(1985-), 男, 硕士研究生, 主要从事大巴山地区构造变形、构造应力场等方面的研究工作。Email:lijianhua0301@126.com

  • 中图分类号: P548

TECTONIC DEFORMATION FEATURES OF SHENNONGJIA REGION IN EASTERN DABASHAN FORELAND STRUCTURAL BELT

  • 摘要: 神农架地区位于大巴山前陆弧形构造带东段, 以阳日断裂为界, 可分为北带基底拆离带和南带神农架隆起, 北带以E -W走向的基底拆离和盖层滑脱为特征, 古生界盖层褶皱紧闭; 南带神农架隆起周缘的盖层变形特征各异, 北缘变形较弱, 东缘变形很强, 其西、南周缘发育特征的裙边状褶皱构造, 南缘裙边褶皱以枢纽大角度倾伏为典型特征。古构造应力场反演结果显示, 该区主要受控于近S -N向主压应力作用; 受到神农架、黄陵两个隆起相向对挤作用, 神农架隆起东缘主压应力方向为NW -SE向, 两个不同方向的应力场可能均与早燕山期大巴山强烈的陆内造山作用有关。综合分析和对比结果显示, 大巴山前陆构造带东段的构造演化历史经历了印支雏形期和早燕山定型期两个构造演化阶段, 神农架基底隆起对大巴山前陆弧型构造带的形成起到了限制作用, 神农架地区的构造变形研究对于探讨大巴山前陆弧形带的形成和演化具有重要的指导意义。

     

  • 图  1  大巴山及邻区地质构造纲要图

    Figure  1.  Structural outline of Daba Mountains and the adjacent areas

    图  2  神农架地区构造纲要及应力场分布平面图

    Figure  2.  Structural outline and tectonic stress fields in Shennongjia region

    图  3  神农架南北向地质廊带与AB构造剖面图

    Figure  3.  N-S structural gallery belt and schematic structural section across Shennongjia

    图  4  神农架地区地层综合柱状图

    Figure  4.  Stratigraphic column of Shennongjia

    图  5  神农架地区断层滑动矢量及其应力反演结果

    Figure  5.  Fault slip vectors in the Shennonghjia region and tectonic stress inversions

    图  6  阳日断裂野外特征

    Figure  6.  Field view of the Yangri fault

    图  7  九湖断裂野外特征

    Figure  7.  Field view of the Jiuhu fault

    图  8  北带盖层变形与基底变形不协调

    Figure  8.  Uncoordinated deformations between the cover and basement in the northern part

    图  9  神农架北缘褶皱特征

    Figure  9.  Field view of the fold in the northern margin

    图  10  神农架东缘褶皱特征

    Figure  10.  Field view of the fold in the eastern margin

    图  11  神农架隆起南缘裙边褶皱特征

    Figure  11.  Field view of the skirt-like fold in the southern margin of Shennongjia uplift

    图  12  晚期断层切割早期褶皱

    Figure  12.  Cutting relationship between earlier fold and late fault

    表  1  大巴山前陆带东段断层滑动矢量及应力场反演结果

    Table  1.   Tectonic stress fields in the eastern part of Dabashan foreland structural belt

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  • 收稿日期:  2009-04-27
  • 刊出日期:  2009-06-28

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