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Major fault zones in the Austroalpine units of the Kreuzeck Mountains south of the Tauern Window (Eastern Alps, Austria)
Swiss Journal of Geosciences ( IF 3.1 ) Pub Date : 2018-12-01 , DOI: 10.1007/s00015-018-0328-1
Gerit E. U. Griesmeier , Ralf Schuster , Bernhard Grasemann

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–Wölz 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–Wölz 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 500 m 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 Großhalsgraben Fault. The latter is mechanically related to the Mölltal 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.

中文翻译:

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(东阿尔卑斯山,奥地利)

Kreuzeck山脉位于北部的Tauern窗口和南部的Southalpine单元之间。他们暴露出了由Adria衍生的大陆壳形成的Eoalpine(白垩纪)尿布叠层。底盘中的科拉尔普-沃尔兹纳普系统部分经历了白垩纪的榴辉岩相变质作用,而悬壁中的Drauzug-Gurktal纳普系统在白垩纪时期仍处于与绿片岩相相近的地层。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。该贡献是基于对克罗伊茨克山脉东南部的比例为1:10000的地图,并结合了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)南倾的沃纳正断层代表500多米宽的剪切带,负责将含榴辉岩的白垩纪带化石的Polinik复合体发掘到地壳浅层(2)渐新世至中新世Ragga-Teuchl断层和(3 )格罗斯哈尔斯格拉本断层。后者与莫塔尔断层在机械上有关,并显示出右旋偏移。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。它由陡峭北倾的莱斯尼格巴赫(Lesnigbach)剪切带和南向剪切力占主导的顶部和ENE-WSW趋势,亚垂直的布拉斯尼格剪切带(显示了左旋运动学)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。
更新日期:2018-12-01
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