Evolution of the Seckau Complex – 2014/15

The Seckau Complex is on of the units that constitute the southern part of the complex orogen  in the Eastern Alps - The Variscan European Belt. in order to clarify its origin several studies were carried out by young and established researchers to unravel the agglomeration of rock assemblages. Geochemical, petrological and geochronological methods have been applied to investigate the Seckau Nappe, as part of the Austroalpine Silvretta-Seckau Nappe System. 

A further compiling study of Mandl et al. (2018) could then provide a new distinction of three lithostratigaphic sub-units: (1) Glaneck Metamorphic Suite, (2) Hochreichart Plutonic Suite and (3) Hintertal Plutonic Suite.

Geochronological map of the Alps, prior to our investigations. Our investigated study area is enlarged in "C".


A = Domains of the Alps, B = Pre-Mesozoic basement units in the Alps, C = Section of the Seckau nappe; Ac = Ackerl Crystalline; Gg = Grobgneiss Complex; GP = Grazer Palaeozoic; Gl = Gleinalm; GWZ = Greywacke zone; K = Kaintaleck slices; Ko = Koralpe; NM = Niedere Tauern and Micaschist-Marble Complexes; P = Plankogel; Re = Rennfeld; Sa = Saualpe, Sp = Speik Complex, ST = Seckauer Tauern (Schulz, 2008; Raumer et al., 2013; Master thesis Raab, 2015).




Here you find CL-images of varies zircon crystals of the new sub-units/metamorphic suits as well as the according 206Pb/238U ages. The white frame indicates the track of the LA-MC-ICP-MS measurement (Mandl et al., 2018).