安徽巢北地区的中生代构造变形及其大地构造背景
基金项目:

本文为国家自然科学基金(编号 40776038、40472098)资助的成果。

  • 摘要
  • | |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • | |
  • 文章评论
    摘要:

    安徽巢北地区位于晚中生代华北高原的东部、郯庐断裂东侧、苏鲁高压—超高压造山带南侧的扬子地块下扬子前陆褶断带北缘,其演化受这个大地构造背景制约,形成了“两向一背”叠加棋盘格式断裂的特征构造样式。这种明显的构造样式和一些隐式构造变形是多幕变形的结果。该区中生代经历了印支期三幕褶皱、三幕逆冲推覆变形。其中第一幕变形发育以下志留统高家边组为主要低角度逆掩拆离面(主拆离面或主滑脱面)和局部相关断展、断滑褶皱为主;第二幕变形才形成该区“两向一背”的褶皱格局和由北西向南东逆冲的叠瓦式逆冲断裂组合,第三幕变形主要为宽缓的北西西轴向的褶皱和近东西向逆冲断裂。至燕山中期又经历了一幕南北向褶皱叠加,燕山晚期的北西向正断层活动在该区表现为倾向北东的多米诺式正断层组合,区域上控制了上白垩统的沉积空间。区域对比表明,印支期变形与苏鲁—大别造山带的构造变形是一致的,说明其动力机制上的相关性,与高压—超高压岩石折返相关;燕山期变形动力与古太平洋板块向西的俯冲和中国东部逃逸构造相关。

    Abstract:

    The Chaobei Region of Anhui Province is tectonically located in the eastern part of the lateMesozoic North China Plateau, to east of the Tanlu fault, and in the northern margin of the Lower Yangtze foldthrust belt of the Yangtze Block in the southern Sulu High Pressure and UltraHigh Pressure orogenic belt. Its evolution is constrained by the tectonic setting and characterized by superimposed faulting structures consisting of two synclines and one anticline. The structure of this kind and concealed structural deformation may attribute to multiphase defomations, including three folding stages in Indosinian and three thrusting related. The firststage deformation is characterized mainly by low angular detachment planes of Lower Siliurian Gaojiabian Formation and the related local faults and faultdetatched folds. The secondstage resulted in the tectonic pattern containing one folding system (two synclines and one anticline) and one NWSEstriking imbricated thrusting complex. The thirdstage is characterized by NWWstriking open folds and lowerangle thrust. During the middle Yanshanian, one NSstriking fold superposed onto the earlier structures. However, the late Yanshanian NWtrending faulting is characterized by NEdipping dominotype normal fault complex in this area, which regionally controls Upper Creatacious depocenter. The regional correlation shows that the Indosinian deformation is in agreement with the SuluDabie deformation, indicating that they are related to exhumation mechanism of the HPUHP rocks in the DabieSulu orogen and that the Yanshanian deformation dynamics is probably related to both the subduction of the PaleoPacific Plate and escaping structure in eastern China.

    参考文献
    相似文献
    引证文献
引用本文

李三忠,李安龙,范德江,赵广涛,金宠,戴黎明.2009.安徽巢北地区的中生代构造变形及其大地构造背景[J].地质学报,83(2):208-217.
lisanzhong,-,-,-,-,-.2009. Mesozoic Structure Deformation of the Chaobei Region, Anhui Province and Its Tectonic Setting[J]. Acta Geologica Sinica,83(2):208-217.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2008-01-31
  • 最后修改日期:2008-05-20