Exploration in polyphase orogens - Brittle deformations of the Calcareous Alps deciphered

Decker, Kurt; Dellmour, Rudi; Linzer, Hans‐Gert; Peresson, Herwig

doi:10.3997/2214-4609.201410285

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“…1). Kinematic analysis revealed sinistral slip (Decker and Peresson, 1996;Linzer et al, 1997;Wang and Neubauer, 1996) accommodating a displacement of 60 km during Oligocene and Miocene times (Linzer et al, 1997(Linzer et al, , 2002. However, a reAnke WÖLFLER, Walter PROCHASKA & Harald FRITZ cent study by Plan et al (2010) demonstrated that the SEMP is still active.…”

Section: Geologymentioning

confidence: 99%

Shear zone related talc mineralizations in the Veitsch nappe of the eastern Greywacke Zone (Eastern Alps, Austria)

Wölfler¹,

Prochaska²,

Fritz³

2015

AJES

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g/cm ) in a pressurised helium atmosphere at 70°C for 8 hours.Multiple measurements of in-house calcite reference material were used and precision of δ18O and δ13Cmeasurement were yielded with ±0.07‰ and ±0.05‰ (1s, n=180), respectively.Oxygen isotope data are reported relative to Vienna Mean Ocean Water (VSMOW) and carbon isotopes relative to Vienna Pee Dee Belemnite (VPDB).Analyses of oxygen isotope ratios of quartz were performed were measured using a DIONEX DX-500 system at LeobenUniversity. Cations (Li , Na , K , Mg , Ca ) were analysed in the aliquots of the same solution.Geologically, the Eastern Alps are the result of the still ongoing convergence between Europe and the Adriatic plate (e.g. (Fig. 1), were tectonically exhumed from below the Austroalpine hanging wall (e.g. Frisch et al. 1998). This process, termed to as lateral extrusion (Ratschbacher et al. 1991a, b), was not only accompanied by the exhumation of the footwall, but also by enhanced fault activity and the formation of intramontane basins (Fig. 1, e.g. Sachsenhofer et al. 1997Sachsenhofer et al. , 1998Sachsenhofer et al. , 2000Wölfler et al. 2011Wölfler et al. , 2012. ________________ _______________________ GeologyFault zones that accommodate the lateral escape are the Brenner-and Katschberg normal faults to the west and east of the Tauern Window, respectively (Selverstone, 1988;Genser and Neubauer, 1989;Scharf et al., 2013), as well as eastwest and north-south striking strike slip fault zones (Fig.1). The northern boundary of the extruding wedge is represented by the Salzach-Ennstal-Mariazell-Puchberg fault system (SEMP) (Fig. 1). Kinematic analysis revealed sinistral slip (Decker and Peresson, 1996;Linzer et al., 1997;Wang and Neubauer, 1996) accommodating a displacement of 60 km during Oligocene and Miocene times (Linzer et al., 1997(Linzer et al., , 2002. However, a reAnke WÖLFLER, Walter PROCHASKA & Harald FRITZ cent study by Plan et al. (2010) demonstrated that the SEMP is still active. The Periadriatic fault system (PAL) separates the Eastern-from the Southern Alps (Fig. 1). While to the south of the Eastern Alps it generally strikes east-west, it forms a system of SW-NE striking fault zones to the SW of the Tauern Window (Fig. 1). Some of the SW-NE striking faults even crosscut the E-W trending faults. East of the Tauern Window, three major fault zones were active during Miocene lateral extrusion:the Mur-Mürz Fault, the Pöls-Lavanttal Fault and the PaltenLiesingtal-Fault (Fig. 1). The Mur-Mürz Fault can be separated into two segments. The western segment originates near the Katschberg normal fault and extends to the Miocene Fohnsdorf basin (Fig. 1). The eastern segment is located east of the the Tauern Window to the Vienna Basin ( Fig. 1 and 2 Fig. 3).The Veitsch nappe is composed of Carboniferous marine to deltaic carbonates and clastic sediments (Ratschbacher, 1987) however, the source area of theses sediments still remains unknown (e.g. Schoenlaub, 1981;Ratschbacher, 1987;Ratschbacher and Frisch, 1993;Handler et al., 1997;Neu...

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