文章已录用:阴山晚中生代板内造山特征及其动力机制-以内蒙古大青山为例
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国家自然科学基金项目(面上项目,重点项目,重大项目)


Characters of Later Jurassic Yinshan Intraplate Orogeny Belt-Evidence from Daqing Shan, Inner Mongolia
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    摘要:

    内蒙古大青山属我国典型的板内造山带阴山山脉的南部山系,其西段缺少大型低角度推覆构造及大型深成岩对前期演化历史的干扰,是研究阴山板内造山特点及过程的理想区域。通过对大青山西段的构造进行几何学和运动学的分析表明,古老结晶基底以逆冲推覆及基底褶皱的形式广泛的巻入中生代构造变形,以及先存构造样式的广泛复活并对后期地层沉积和断层发育的控制作用是内蒙古大青山地区中生代板内造山的两个基本特征。这些变形特征反映了阴山带板内造山过程中,是以结晶基底为受力层,并控制上覆盖层进行构造变形的,进而表明板内造山主要是由水平挤压应力造成的。结合研究区构造变形特点及邻区中生代构造地质情况的分析认为,晚侏罗世时期之所以在阴山带形成强烈的板内造山运动,是由其北部西伯利亚板块与蒙古褶皱带碰撞产生的板缘应力的远程传递,以及其南侧强硬的鄂尔多斯地块的阻挡共同作用而形成的。

    Abstract:

    The Daqing Shan is the south part of the typical intraplate orogeny, Yinshan belt. The western Daqing Shan lack the large scale low-angle thrust faults and plutons that obscure the belt’s early history. Thus, this area is an ideal locality to understand the characters of the Yinshan intraplate orogeny. Through the field measure, geometrical and kinematical analysis of structures of western Daqing Shan, it can be concluded that Yinshan intraplate orogeny has two basal features, one is that the crystalline basement was widely involved in the Mesozoic tectonic deformation as thrust nappes and basement-involved folds, and the other is the pre-exist structures were universally rejuvenated and controlled the distribution of succeeding sediments and the development of reverse and thrust faults. These features imply that the crystalline basement is the bearing subsistence during the formation of Yinshan orogeny, and imply that the intraplate orogeny was caused by horizontal pressure. Combine the structure deformation characters of adjacent area, it can be drawn that the far field effect of the closure of northern Mongolia-Okhotsk Ocean and the resistance of the southern rigid Ordos Block are the two reason of formation of Yinshan intraplate orogeny.

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杜菊民.2009.文章已录用:阴山晚中生代板内造山特征及其动力机制-以内蒙古大青山为例[J].地质学报,83(7):910-922.
Du Jumin.2009. Characters of Later Jurassic Yinshan Intraplate Orogeny Belt-Evidence from Daqing Shan, Inner Mongolia[J]. Acta Geologica Sinica,83(7):910-922.

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  • 收稿日期:2008-07-21
  • 最后修改日期:2008-07-21
  • 录用日期:2008-07-22
  • 在线发布日期: 2009-07-15
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