- 1TU Bergakademie Freiberg, Institute of Geology, Tectonics, Freiberg, Germany
- 2LfULG Sachsen, Halsbrücker Straße 31a, 09599 Freiberg, Germany
We present a new scheme for the tectono-metamorphic architecture of the Erzgebirge. While we follow the scheme of previous studies (Konopásek & Schulmann, 2005; Rötzler & Pleesen, 2010) we made significant changes based on our study of the distribution of high-pressure metamorphism. Our model consists from bottom to top of the following levels: (1) a Lower Gneiss Unit (LGU) that consists of gneisses with both Proterozoic and Ordovician protoliths and experienced amphibolite-facies peak metamorphism; (2) an Upper Gneiss Unit (UGU) that consists of a UHP-metamorphic subunit mainly made from Ordovician protoliths. This UHP unit is sandwiched between a mixed HP gneiss unit, which is dominated by Proterozoic meta-greywackes, but also containins bodies with Ordovician protolith ages. We observe HP eclogites throughout this entire gneiss matrix and do not support models of an eclogite free tectonic level within the UGU; (3) a Mica Schist Unit (MSU) that likewise consists of two subunits: firstly, a MSU sensu stricto made of Ordovician metasediments and rare amphibolites, which experienced only amphibolite-facies peak conditions. Secondly, an internal nappe, that consists of HP-gneisses and eclogites from various Ordovician protoliths. The structural position and the extent of this HP subunit, especially the relation to the HP rocks in the UGU remain enigmatic. We propose fundamental tectonic boundaries between all mentioned units and subunits in the area.
How to cite: Keseberg, M., Görz, I., Weber, S., and Nagel, T.: Tectonic Architecture of the Erzgebirge/Krušné Hory, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-19223, https://doi.org/10.5194/egusphere-egu25-19223, 2025.