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湖南桑植―石门复向斜走廊剖面构造特征分析

, PP. 215-222

Keywords: 桑植―石门复向斜,构造样式,构造滑脱面,变形机制

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Abstract:

为了查明桑植―石门复向斜的地表、地下构造特征及其相互间的关系,采取了详细的地表走廊剖面的测量,以及结合地震勘探资料和大地电磁测深(MT)资料的综合解释。桑植―石门复向斜可进一步划分为四个次一级的构造带,从北向南依此是:堰塘湾构造带、四望山构造带、江垭构造带及教子垭构造带。江垭构造带和教子垭构造带的地面构造特征与地下构造特征具有一致性,基本上为构造简单的北倾斜坡;而四望山构造带的地面构造特征与地下构造特征存在着明显的不协调性。这种变形特征可解释为沿盖层间滑脱面的逆冲,以及断弯背斜的形成,上覆构造层中的褶皱向下消失在滑脱面上,形成所谓的“无根褶皱”。

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