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首页> 外文期刊>Swiss journal of geosciences >Major fault zones in the Austroalpine units of the Kreuzeck Mountains south of the Tauern Window (Eastern Alps, Austria)
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Major fault zones in the Austroalpine units of the Kreuzeck Mountains south of the Tauern Window (Eastern Alps, Austria)

机译：陶恩之窗以南的克罗伊茨克山脉的奥索高山单元的主要断层带（奥地利阿尔卑斯山）

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摘要

The Kreuzeck Mountains are located between the Tauern Window in the north and the Southalpine unit in the south. They expose an Eoalpine (Cretaceous) nappe stack of Adria derived continental crust. The Koralpe-Wolz Nappe System in the footwall partly experienced Cretaceous eclogite-facies metamorphism, while the Drauzug-Gurktal Nappe System in the hanging wall remained at anchizonal to greenschist-facies conditions in Cretaceous time. From the Late Cretaceous onward the Austroalpine units in the Kreuzeck Mountains were affected by brittle/ductile shearing and brittle deformation. This contribution is based on mapping of the southeastern part of the Kreuzeck Mountains at the 1:10000 scale in combination with structural and petrological investigations and Rb-Sr biotite dating. The new data indicate that the boundary between the Koralpe-Wolz Nappe System and the overlying Drauzug-Gurktal Nappe System consists of three segments. It includes (1) the south dipping Wallner Normal Fault representing a more than 500m wide shear zone responsible for the Cretaceous exhumation of the eclogite-bearing Polinik Complex to shallow crustal levels (2) the Oligocene to Miocene Ragga-Teuchl Fault and (3) the Gro ss halsgraben Fault. The latter is mechanically related to the Molltal Fault and shows a dextral offset. The Drauzug-Gurktal Nappe System is from bottom to top composed of the Strieden, the Gaugen and the Goldeck complexes, which are transgressively overlain Permo-Triassic (meta)sediments. It is dissected by the steeply north dipping Lessnigbach Shear Zone with a dominant top to the south reverse sense of shear and the ENE-WSW trending, sub-vertical Blassnig Shear Zone showing sinistral kinematics. Both faults were active in the Late Cretaceous, but might have been initiated in the Late Jurassic.
机译：Kreuzeck山脉位于北部的Tauern窗口和南部的Southalpine单元之间。他们暴露了由Adria衍生的大陆壳形成的Eoalpine（白垩纪）尿布叠层。下盘壁的科拉普-沃尔兹纳普系统部分经历了白垩纪的榴辉岩相变质作用，而在白垩纪时期，悬挂壁中的Drauzug-Gurktal纳普系统仍处于沿顺层至绿片岩相的条件。从白垩纪晚期开始，克罗伊茨克山脉的奥高山单元受到脆性/延性剪切和脆性变形的影响。这项贡献是基于对克罗伊茨克山脉东南部以1：10000比例绘制的地图，并结合结构和岩石学研究以及Rb-Sr黑云母定年。新数据表明，Koralpe-Wolz纳普系统与上覆的Drauzug-Gurktal纳普系统之间的边界包括三个部分。它包括（1）南倾的沃纳正断裂（Wallner Normal Fault），代表一个500m宽的剪切带，负责将榴辉岩含榴辉岩的Polinik复合体发掘到浅层地壳（2）渐新世至中新世Ragga-Teuchl断裂和（3） Gro ss halsgraben断层。后者在机械上与Molltal断层有关，并显示右旋偏移。 Drauzug-Gurktal尿布系统由下至上，由Strieden，Gaugen和Goldeck配合物组成，这些配合物在海侵上覆盖了Permo-Triassic（meta）沉积物。它由陡峭北倾的莱瑟尼格巴赫剪切带和南向剪切力占主导地位的南顶切斯尼格巴赫剪切带和表现出正弦运动学的ENE-WSW趋势，亚垂直的布拉斯尼格剪切带进行了解剖。两种断层都在白垩纪晚期活跃，但可能是在侏罗纪晚期开始的。

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