Major fault zones in the Austroalpine units of the Kreuzeck Mountains south of the Tauern Window (Eastern Alps, Austria)

Griesmeier, Gerit E. U.; Schuster, Ralf; Grasemann, Bernhard

doi:10.1007/s00015-018-0328-1

Cited by 2 publications

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“…Top‐to‐the‐ESE normal faulting may explain the difference in ZHe ages obtained from the central and northeastern Nock Mountains (Figure 4), because it placed the Drauzug‐Gurktal nappe in a hanging‐wall position relative to the Ötztal‐Bundschuh nappe in the footwall (Figures 3c and 8) (Koroknai et al., 1999; Rantitsch et al., 2020). Late Cretaceous extension was, however, not limited to the Gurktal Alps but occurred orogen‐wide, as indicated by normal faulting in the entire Austroalpine nappe stack (e.g., Schuster et al., 2013), including Austroalpine units exposed in the Saualpe, Koralpe and other regions east of the Gurktal Alps (Krenn et al., 2008; Krohe, 1987; Kurz et al., 2002; Neubauer et al., 1995; Rantitsch et al., 2005; Schorn & Stüwe, 2016; Wiesinger et al., 2006), in the Kreuzeck block southeast of the Tauern window (Griesmeier et al., 2018; Hoke, 1990; Wölfler, Frisch, et al., 2015) and in the Ötztal Alps west of the Tauern Window (Froitzheim et al., 1997; Fügenschuh et al., 2000; Krenn et al., 2011; Ratschbacher et al., 1989). Extensional deformation resulted in rapid cooling of high‐pressure rocks below ∼400°C until ca.…”

Section: Discussionmentioning

confidence: 99%

Phases of Enhanced Exhumation During the Cretaceous and Cenozoic Orogenies in the Eastern European Alps: New Insights From Thermochronological Data and Thermokinematic Modeling

Wölfler,

Wolff,

Hampel

et al. 2023

Tectonics

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Austroalpine nappes in the Eastern European Alps have preserved the record of orogenies in the Cretaceous and Cenozoic but their cooling and exhumation history remains poorly constrained. Here we use low‐temperature thermochronology and thermokinematic modeling to unravel the exhumation history of the Austroalpine nappes in the Gurktal Alps. Our data reveal marked differences between the exhumation of units located at different positions within the nappe stack and relative to the Adriatic indenter. Units located at a high structural level and farther away from the indenter cooled through the zircon fission track closure temperature in the Late Cretaceous and have resided at depths of ≤5‐6 km since the Oligocene, as indicated by apatite fission track ages of 35‐30 Ma. Thermokinematic modeling constrained that these units experienced enhanced exhumation (∼0.60 km/Ma) between ∼99 and ∼83 Ma due to syn‐ to late‐orogenic Late Cretaceous extension. After a phase of slow exhumation (∼0.02 km/Ma), the exhumation rate increased to ∼0.16 km/Ma at ∼34 Ma due to the onset of the Europe‐Adria collision. In contrast, zircon fission track ages from units at a lower structural level and near the indenter indicate cooling during the Eocene; apatite fission track ages cluster at ∼15 Ma. These units were rapidly exhumed (∼0.76 km/Ma) from ∼44 Ma to ∼39 Ma during an Eocene phase of shortening prior to the Europe‐Adria collision. After slow exhumation (∼0.13 km/Ma) between ∼39 and ∼18 Ma, the exhumation rate increased to ∼0.27 km/Ma in the wake of Miocene escape tectonics in the Eastern Alps.This article is protected by copyright. All rights reserved.

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Section: Discussionmentioning

confidence: 99%

Phases of Enhanced Exhumation During the Cretaceous and Cenozoic Orogenies in the Eastern European Alps: New Insights From Thermochronological Data and Thermokinematic Modeling

Wölfler,

Wolff,

Hampel

et al. 2023

Tectonics

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“…Structurally above, different Variscan metamorphic units with Ordovician orthogneiss bodies occur, partly with a Permomesozoic cover. In some places these units are separated or cut by several hundred meters wide, steeply inclined shear zones, which might have formed during latest Jurassicearliest Cretaceous strike-slip tectonics (Schuster et al, 2015;Griesmeier et al, 2019). These faults can be compared to the Masul shear zone based on their estimated age and tectonic position, but until now no clear evidence for an important strike slip deformation along the Masul shear zone could be found in the field.…”

Section: Correlation Of the Mmns With Other Elements Of The Austroalp...mentioning

confidence: 99%

Petrological and geochronological investigations on the individual nappes of the Meran-Mauls nappe stack (Austroalpine unit/South Tyrol, Italy)

Pomella

Costantini²,

Aichholzer

et al. 2022

Austrian Journal of Earth Sciences

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The Meran-Mauls nappe stack is part of the Austroalpine unit in South Tyrol (Italy). There it holds a special position directly in front of the Southalpine Dolomites indenter and west of the Tauern Window. It is situated in the hanging wall of the Southalpine unit, above a NW dipping segment of the Periadriatic fault system, namely the Meran-Mauls fault. Also all other sides are defined by Oligocene-Miocene strike-slip and normal faults. Based on recent mapping the Meran-Mauls nappe stack consists of three nappes separated by NW to NNW dipping shear zones. The lowermost nappe in the southwest is represented by the Schenna (Scena) unit. It is overlain along the Masul shear zone by a nappe consisting of the Hirzer (Punta Cervina) unit and the Pens (Pennes) unit including Triassic (meta)sediments. Separated by the Fartleis fault the St. Leonhard (San Leonardo) unit forms the uppermost nappe. The aim of this study is to describe the individual units and the separating structural elements more properly, based on new structural, petrological, geothermobarometric and geochronological data and to compare these units to other Austroalpine elements in the vicinity. Sillimanite-bearing paragneiss, minor amphibolite and quartzite as well as a distinct marble layer close to its base characterise the Schenna unit. Further, it contains pegmatite dikes, presumably Permian in age. Amphibolite-facies P-T conditions of c. 0.55 ± 0.15 GPa and 600 ± 100°C are thus correlated with a Permian metamorphic imprint. The Masul shear zone mostly consists of mylonitic paragneiss of the Hirzer unit. It is pre-Alpine in age and probably formed during the Jurassic. For the paragneiss of the Hirzer unit upper greenschist- to amphibolite-facies metamorphic conditions of 0.4-0.50 ± 0.15 GPa and 550 ± 70°C are attributed to the Variscan tectonometamorphic imprint. The whole Pens unit represents a shear zone. Due to the occurrence of Permotriassic (meta)-sediments within this shear zone, it is an Alpine structure, as well as the bordering Fartleis fault. Rb/Sr biotite ages yield sometimes partly reset pre-Alpine age values in the whole Meran-Mauls nappe stack, indicating a pervasive anchizonal to lowermost greenschist-facies metamorphic overprint during the Eoalpine tectonometamorphic event. Tectonostratigraphically the Meran-Mauls nappe stack can be attributed to the Drauzug-Gurktal nappe system. The latter forms the uppermost structural element of the Austroalpine nappe stack and thus only shows a weak Eoalpine metamorphic overprint. With respect to its special lithologic composition the Schenna unit can be correlated with the Tonale unit in the southwest and the Strieden-Komplex in the east.

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Major fault zones in the Austroalpine units of the Kreuzeck Mountains south of the Tauern Window (Eastern Alps, Austria)

Cited by 2 publications

References 19 publications

Phases of Enhanced Exhumation During the Cretaceous and Cenozoic Orogenies in the Eastern European Alps: New Insights From Thermochronological Data and Thermokinematic Modeling

Phases of Enhanced Exhumation During the Cretaceous and Cenozoic Orogenies in the Eastern European Alps: New Insights From Thermochronological Data and Thermokinematic Modeling

Petrological and geochronological investigations on the individual nappes of the Meran-Mauls nappe stack (Austroalpine unit/South Tyrol, Italy)

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