Alpine metamorphism in the central segment of the Western Greywacke Zone (Eastern Alps)

Abstract

Abstract:The metamorphic pattern of the central Western Greywacke Zone (Austroalpine, Eastern Alps) was investigated by organic matter reflectance, Raman spectroscopy on organic matter and clay mineralogical methods. Raman data map a 10 km wide thermal aureole along the contact zone of the Greywacke Zone to the Penninic Tauern Window. The estimated maximum temperatures of 400 °C to 200 °C decrease from South to North, that is from the contact to the uppermost parts of the Greywacke Zone. This pattern is explained by an Oligocene to Miocene thermal pulse, related to the rapid exhumation of formerly deeply buried rocks of the Penninic unit. During this event, advective heat transport and circulating fluids overprinted the Cretaceous higher anchi-to lower epizonal metamorphic pattern of the central Western Greywacke Zone.

3-D assessment of peak-metamorphic conditions by Raman spectroscopy of carbonaceous material: an example from the margin of the Lepontine dome (Swiss Central Alps)

“…These temperatures are generally in good agreement with the corresponding tectono-metamorphic setting (e.g. Rantitsch et al 2004Rantitsch et al , 2005Guedes et al 2005;Judik et al 2008;Kribek et al 2008;Rantitsch and Judik 2009); (2) The geothermometer provided by Rahl et al (2005) was calibrated with a 532-nm laser as well, and as discussed later (see ''Comparison between the available calibration methods'') and also shown by other investigations (e.g. Judik et al 2008;Kribek et al 2008), the recorded peak-metamorphic temperatures were generally close to those obtained by the calibration of Beyssac et al (2002a); (3) Some samples investigated by this study were collected in the same area as that used for the calibration by Beyssac et al (2002a; their sample ''luk/Lukmanier''), i.e.…”

“…Therefore, this geothermometer always reliably records the peak temperature reached by a rock specimen along its P-T-path (e.g. Beyssac et al 2004Beyssac et al , 2007Bollinger et al 2004;Rantitsch et al 2004Rantitsch et al , 2005Guedes et al 2005;Rahl et al 2005;Negro et al 2006;Judik et al 2008;Kribek et al 2008;Angiboust et al 2009;Gabalda et al 2009;Rantitsch and Judik 2009;Aoya et al 2010).…”

Provenance and Variscan low-grade regional metamorphism recorded in slates from the basement of the (SW Hungary)

“…These features correspond to epizonal thermal conditions during the deformation as well (Paschier and Trouw 2005;Stipp et al 2002). The appearance of the deformational microstructures indicates flattening strain based on the principal axis of the clasts (Flinn 1962;Ramsey and Huber 1983).…”

Review: Natural tracers in fractured hard-rock aquifers in the Austrian part of the Eastern Alps—previous approaches and future perspectives for hydrogeology in mountain regions

“…The Greywacke zone is a 450-km long and at most 23-km wide east-west-trending strip (Schönlaub 1980) that divides the NCA from the Penninic Tauern Window (Rantitsch and Judik 2009). This belt consists of a lithological mixture of metamorphic silicate and carbonate ranges (Schönlaub 1980).…”