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首页> 外文期刊>Journal of geodynamics >Alleghanian orogenic-float on the Martic thrust during dextral transpression, central Appalachian Piedmont
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Alleghanian orogenic-float on the Martic thrust during dextral transpression, central Appalachian Piedmont

机译：阿巴拉契亚山脉中部右旋压制过程中马勒冲刺上的Alleghanian造山运动

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摘要

During the Late Paleozoic Alleghanian orogeny, the mid-Atlantic Piedmont experienced transpressional deformation dominated by dextral strke-slip shear zones. The dextral displacement on these shear zones greatly influenced the geographic distribution oflithotectonic units. Transpressional deformation is evident in the Piedmont with the cogenetic development of domes and en-echelon antiforms between many of the shear zones. In the core of the Pennsylvania reentrant, major Alleghanian structures include the dextral Pleasant Grove shear zone and Tucquan-Mine Ridge antiform. Recent field mapping coupled with detailed metamorphic and deformation fabric studies have revealed that a major thrust, the Martic thrust, was also active during this time. Shear bands were identified during petrofabric analysis of the hanging wall rocks to the Martic thrust. The direction of displacement on these shear bands was parallel to the orogen, a direction contrary to earlier studies. Metamorphic mineral assemblages and ceased reaction textures, associated with ductile shear fabrics in the hangingwall rocks, are consistent with lower greenshist facies deformation. This low grade metamorphism, which is generally confined to sheared rocks, overprints the regional upper greenshist- to lower amphibolite-facies assemblages. Structural and magnetic modeling of the hangingwall block has revealed a complex geometry. A model of orogen parallel structural escape, or orogenic float, related to late Paleozoic dextral transpression is employed to explain the late reactivation on this important central Appalachian structure.
机译：在古生代晚期的Alleghanian造山运动中，大西洋中部的皮埃蒙特经历了以右旋走滑剪切带为主的超压变形。这些剪切带上的右旋位移极大地影响了岩石构造单元的地理分布。在皮埃蒙特，随着许多剪切带之间穹顶和梯级反型的共生发展，压迫变形明显。在宾夕法尼亚州折返的核心地带，主要的Alleghanian结构包括右旋Pleasant Grove剪切带和Tucquan-Mine Ridge反型。最近的野外测绘以及详细的变质和变形构造研究表明，在此期间，主要的逆冲作用，即马氏逆冲作用也很活跃。在岩壁垂向岩壁的岩石织物分析过程中，确定了剪切带。这些剪切带上的位移方向与造山带平行，与早期研究相反。与上壁岩石中的韧性剪切织物相关的变质矿物组合和停止的反应织构与较低的绿色史相变形一致。这种低品位的变质作用通常仅限于剪切岩石，覆盖了该地区上绿岩-下闪石相的组合。悬墙砌块的结构和磁性建模显示出复杂的几何形状。一个与晚古生代右旋压抑有关的造山带平行结构逸出或造山带浮游模型被用来解释这一重要的阿巴拉契亚中央构造的晚期再活化。

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