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断层转折褶皱剪切裂缝发育模式探讨

祖克威 曾联波 赵向原 刘国平

祖克威, 曾联波, 赵向原, 等, 2014. 断层转折褶皱剪切裂缝发育模式探讨. 地质力学学报, 20 (1): 16-24.
引用本文: 祖克威, 曾联波, 赵向原, 等, 2014. 断层转折褶皱剪切裂缝发育模式探讨. 地质力学学报, 20 (1): 16-24.
ZU Ke-wei, ZENG Lian-bo, ZHAO Xiang-yuan, et al., 2014. DISCUSSION ON DEVELOPMENT MODELS OF THE SHEARING FRACTURES IN FAULT BEND FOLDS. Journal of Geomechanics, 20 (1): 16-24.
Citation: ZU Ke-wei, ZENG Lian-bo, ZHAO Xiang-yuan, et al., 2014. DISCUSSION ON DEVELOPMENT MODELS OF THE SHEARING FRACTURES IN FAULT BEND FOLDS. Journal of Geomechanics, 20 (1): 16-24.

断层转折褶皱剪切裂缝发育模式探讨

基金项目: 

国家自然科学基金项目 41272164

国家科技重大专项 2011ZX05003-002

详细信息
    作者简介:

    祖克威(1986-),男,博士,地质学专业,主要从事应力场分析与裂缝预测。E-mail:zukewei1234@aliyun.com

  • 中图分类号: P542.3

DISCUSSION ON DEVELOPMENT MODELS OF THE SHEARING FRACTURES IN FAULT BEND FOLDS

  • 摘要: 围绕库车前陆盆地内某典型断层转折褶皱剖面,实测统计该剖面不同构造部位的剪切裂缝,分析断层转折褶皱中剪切裂缝的发育规律,进而建立断层转折褶皱剪切裂缝的发育模式。统计结果表明,研究区剪切裂缝有2种类型,一类是与岩层面高角度相交的高角度缝,广泛发育在构造各个部位;另一类是与层面近于平行的顺层裂缝,主要发育在断层面附近,并随岩层的变形,产状发生改变。远离断层面,剪切裂缝发育程度整体上呈减小趋势,下盘裂缝发育强度的减小大于上盘,上盘裂缝发育强度整体大于下盘。褶皱内层剪切裂缝较外层发育,褶皱两翼裂缝发育强度大于褶皱枢纽。断层产状的改变,会引起上盘运动状态的改变,使得在上盘活动轴面附近出现应力集中,局部剪切裂缝发育强度出现增大现象。断层转折褶皱剪切裂缝的发育模式可以分为3个阶段,断层形成前主要发育与层面高角度相交的区域性剪切裂缝;断层形成初期,断层面附近两盘牵引变形不明显,上盘穿过断坡下部破折点处活动轴面的部分会产生新的剪切裂缝,即与岩层高角度相交剪切缝和与断层面低角度相交剪切缝;牵引构造明显时,断层面附近两盘弯曲部位会产生顺层剪切裂缝,两翼的裂缝发育强度大于枢纽。

     

  • 图  1  库车前陆盆地构造纲要图

    Figure  1.  Structure outline map of Kuqa foreland basin

    图  2  断层转折褶皱野外露头剖面图

    (a, b, c为照相区域, AA'为断层面的位置)

    Figure  2.  A profile map of outcrop of fault-bend fold in Kuqa, Xinjiang

    图  3  剖面上与岩层面高角度相交的剪切裂缝

    Figure  3.  Shear fractures with high angle crossing to the layer in the section

    图  4  裂缝发育强度与距断层距离关系散点图

    (断层面位于图 2中AA'处)

    Figure  4.  Scatter diagram showing relationship between fracture development intensity and distance to the fault

    图  5  野外露头的局部照片

    (照片编号与图 2中的编号对应)

    Figure  5.  Pictures of outcrops in the field

    图  6  褶皱上三处测点的位置图

    (黄色部分表示测量区域)

    Figure  6.  Locations of the three measurement sites in the fold

    图  7  断层转折褶皱剪切裂缝发育模式图

    Figure  7.  Development models of shearing fractures in fault bend fold

    表  1  裂缝发育强度与距断层距离关系统计

    Table  1.   Statistics of relationship between fracture development intensity and distance to the fault

    点号 密度(条/m) 位置
    1 33.3 下盘紧靠断层面
    2 11.1 下盘距层面1.5 m
    3 5.0 下盘距层面3.5 m
    4 3.7 下盘距断面6.2 m
    5 23.0 上盘距断面1.0 m
    6 33.3 上盘距断面1.7 m
    7 19.7 上盘距断面3.5 m
    8 14.1 上盘距断面4.2 m
    9 15.6 上盘距断面6.0 m
    10 8.2 上盘距断面9.6 m
    11 6.3 上盘距断层面12.0 m
    下载: 导出CSV

    表  2  卡普沙良河剖面上断层相关褶皱不同部位的裂缝密度

    Table  2.   Fracture densities in different positions of fault-related fold in Kapushaliang River

    构造部位 前翼(a处) 枢纽(b处) 后翼(c处)
    裂缝密度/(条·m-1) 33.3 25 58.5
    25 20 33.3
    20 12.72 25
    9.1 10 16.7
      注:每列数据自上而下反映的是从褶皱核部至外部的裂缝发育情况
    下载: 导出CSV
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  • 收稿日期:  2013-10-23
  • 刊出日期:  2014-03-28

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