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巧家拉分盆地结构特征及其形成演化过程分析

裴向军 李天涛 黄润秋 王双

裴向军, 李天涛, 黄润秋, 王双. 巧家拉分盆地结构特征及其形成演化过程分析[J]. 西南交通大学学报, 2019, 54(2): 278-286. doi: 10.3969/j.issn.0258-2724.20170206
引用本文: 裴向军, 李天涛, 黄润秋, 王双. 巧家拉分盆地结构特征及其形成演化过程分析[J]. 西南交通大学学报, 2019, 54(2): 278-286. doi: 10.3969/j.issn.0258-2724.20170206
PEI Xiangjun, LI Tiantao, HUANG Runqiu, WANG Shuang. Structural Features and Evolutionary History of Qiaojia Pull-Apart Basin[J]. Journal of Southwest Jiaotong University, 2019, 54(2): 278-286. doi: 10.3969/j.issn.0258-2724.20170206
Citation: PEI Xiangjun, LI Tiantao, HUANG Runqiu, WANG Shuang. Structural Features and Evolutionary History of Qiaojia Pull-Apart Basin[J]. Journal of Southwest Jiaotong University, 2019, 54(2): 278-286. doi: 10.3969/j.issn.0258-2724.20170206

巧家拉分盆地结构特征及其形成演化过程分析

doi: 10.3969/j.issn.0258-2724.20170206
基金项目: 国家创新研究群体科学基金(41521002);国家自然科学基金面上资助项目(41572302);国家自然科学基金青年基金资助项目(41602305)
详细信息
    作者简介:

    裴向军(1970—),男,教授,研究方向为地质灾害评价与治理,E-mail:peixj0119@tom.com

  • 中图分类号: P642.2

Structural Features and Evolutionary History of Qiaojia Pull-Apart Basin

  • 摘要: 为了探明巧家盆地的性质、成因以及其演化过程,通过详细野外调查,结合区域构造特征对巧家盆地展开了初步的研究. 首先基于详细的野外调查工作,掌握了研究区基本地质背景条件以及盆地表面的沉积特征;进而,对盆地中心区域进行了钻孔勘测,得到了盆地内部结构特征,结合区域地质背景和盆地结构特征,对其形成演化过程进行了分析. 研究结果表明:巧家盆地为典型的拉分断陷盆地,主要受小江走滑断裂带的控制;盆地内部结构主要包括了5个地层层序,从下到上分别为古河流冲积层、昔格达组地层、静水沉积层、泥石流洪积层以及河流阶地,并解释了各层成因;首次发现在距盆地下游边界3 km处曾发生过大规模堰塞堵江事件;堰塞事件发生于距今3万年左右;初步推测该拉分盆地形成于第三纪晚期,后期又经历了断陷湖沉积、堰塞沉积、泥石流洪积以及河流冲积等作用;区域断块阶段、局部拉分断陷阶段、断陷湖相沉积阶段、堰塞沉积阶段、堰塞消亡阶段以及不均匀升降阶段为盆地形成的6个阶段,与盆地内部土层层序有较好的对应性.

     

  • 图 1  研究区地理位置及区域构造格架

    Figure 1.  Location of the study area and regional tectonic framework

    图 2  研究区地貌及地质构造结构

    Figure 2.  Schematic diagram of geomorphology and tectonic structures

    图 3  盆地表面特征及钻孔剖面布置

    Figure 3.  Surface features and locations of drill holes

    图 4  阶地剖面

    Figure 4.  Schematic diagram showing cross-sectional profile of terraces

    图 5  钻孔柱状图

    Figure 5.  Stratigraphic columns of drill cores

    图 6  盆地剖面

    Figure 6.  Topographic and reconstructed geological sections

    图 7  巧家县城段地质结构特征

    Figure 7.  Structural features of the Qiaojia basin

    图 8  堰塞坝位置

    Figure 8.  Location of the barrier dam

    图 9  滑坡残留体边界特征

    Figure 9.  Boundary features of the residual landslide

    图 10  巧家拉分盆地演化过程

    Figure 10.  Evolution process of the Qiaojia basin

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出版历程
  • 收稿日期:  2017-03-22
  • 修回日期:  2017-07-24
  • 网络出版日期:  2017-09-27
  • 刊出日期:  2019-04-01

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