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首页> 外文期刊>Journal of geodynamics >Restraining stepover deformation superimposed on a previous fold-and-thrust-belt: A case study from the Mt. Kumeta-Rocca Busambra ridges(western Sicily, Italy)
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Restraining stepover deformation superimposed on a previous fold-and-thrust-belt: A case study from the Mt. Kumeta-Rocca Busambra ridges(western Sicily, Italy)

机译：叠加在先前的褶皱和冲断带上的抑制跨步变形：来自Mt.库梅塔-罗卡·布桑布拉山脊（意大利西西里岛西部）

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The western segment of the Sicilian Apennines (southern Italy) is affected by poly phase deformation characterized by non-coaxial structural associations. In particular, this study is focused on two narrow ～E-W oriented structural and topographic culminations of the fold and thrust belt (Mt. Kumeta and Rocca Busambra ridges), resulting from the exhumation of a deep-seated tectonic unit. A detailed field mapping and meso-structural analysis reveals that since Pliocene time the region was tectonically controlled by the propagation of two major NW-SE oriented right-lateral shear zones and associated structures that often propagated along inherited discontinuities. In particular, the left-stepping geometry and the sense of motion of these regional strike-slip fault systems produced in the overlapping area a wide rhomboidal-shaped contractional region characterized by the occurrence of double-verging ～E-W striking compressive structures. These bound the Mt. Kumeta and Rocca Busambra carbonate ridges, forming a pair of pop-up structures which link the coeval transcurrent boundary faults. Field data show that contractional structures are affected by significant bending along strike that increases close to the major shear zones. Structural rotations around the vertical axis allowed the carbonate ridges to develop a typical sigmoidal shape. The topographic expression and the internal structural architecture, compared with experimental models describing deformations associated with segmented strike-slip faults, suggest that the analyzed segment of Sicilian fold and thrust belt can be interpreted as a restraining stepover in which crustal shortening, exhumation and vertical axis rotation occurred. Moreover, field data, compared to the subsurface setting imaged by the analysis of available geophysical data (e.g. gravimetric maps and available/interpreted seismic profiles), reveal that, since Pliocene times, the restraining stepover deformation was transversally superimposed on a pre-existing NE-SW oriented thrust and fold system related to the Miocene Africa-Europe collision.
机译：西西里亚亚平宁山脉（意大利南部）的西段受到多相变形的影响，这种变形的特征是非同轴的结构联系。尤其是，这项研究的重点是褶皱和逆冲带的两个狭窄〜E-W定向的构造和地形顶点（库梅塔山和罗卡·布桑布拉脊），这是由深部构造单元的掘出所致。详细的田间制图和细观结构分析表明，自上新世以来，该区域受两个主要的西北向东南方向右剪切带和通常沿继承的不连续面传播的相关构造的传播构造控制。尤其是这些区域走滑断层系统的左阶几何学和运动感在重叠区域产生了一个宽菱形收缩区域，其特征是出现了双趋向〜E-W打击压缩结构。这些限制了山。库梅塔和罗卡·布萨姆布拉的碳酸盐脊，形成了一对弹出式结构，它们连接了当时的跨流边界断层。现场数据表明，收缩结构受到沿走向的弯曲的影响，该弯曲沿靠近主要剪切带的方向增加。围绕垂直轴的结构旋转使碳酸盐脊形成典型的S形。与描述分段走滑断层相关变形的实验模型相比，地形表达和内部结构构造表明，分析的西西里褶皱和逆冲带段可以解释为地壳缩短，发掘和垂直轴的抑制性过渡。发生旋转。此外，与通过分析可用地球物理数据（例如重力图和可用/解释的地震剖面）成像的地下环境相比，野外数据显示，由于上新世时期以来，抑制阶跃变形横向叠加在预先存在的NE上与中新世非洲-欧洲碰撞有关的-SW型推力和褶皱系统。

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