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Discrete pulses of Variscan magmatic activity in the Erzgebirge (Eastern Variscan belt) and their relation to ore formation

Recently, new age data have been published for the Variscan magmatism as well as for times of ore formation in the Erzgebirge (e.g., Breitkreuz et al., 2021; Burisch et al., 2019; Meyer et al., 2024; Leopardi et al., 2023; Löcse et al., 2020; Reinhardt et al., 2022; Tichomirowa et al. 2019, 2022). Förster and Romer (2010) wrote in their compilation on Carboniferous Magmatism that two major periods of magmatic activity occurred in the Erzgebirge. During the first period (327 - 318 Ma) most of the large plutons in the Western Erzgebirge were formed and probably also the volcano-plutonic rocks of the Altenberg-Teplice Caldera (ATVC) in the Eastern Erzgebirge (Förster and Romer, 2010). The second major period of magmatic activity was assigned by these authors to small subsurface granites and various subvolcanic rhyolithic dykes and microgranites (305 – 295 Ma). New high-precision dating of the major plutons in the Western Erzgebirge slightly shifted the proposed time interval for the first magmatic period (323-314 Ma; Tichomirowa et al., 2019). Based on new high-precision ages it was shown that the magmatic activity in the Western and Eastern Erzgebirge was diachronic and that the first volcanites in the Eastern Erzgebirge were already formed at ca. 322 Ma (Tichomirowa et al., 2022). We present new high precision age data for the second magmatic period from the Western and Eastern Erzgebirge and compare the age data of Variscan magmatic activity with the data for ore formation.

Details

Author
Marion Tichomirowa1, Alexandra Käßner1, Mathias Burisch2, Sebastian Weber3
Institutionen
1TU Bergakademie Freiberg, Germany; 2Colorado School of Mines; 3Sächsisches Landesamt für Landwirtschaft, Umwelt und Geologie
Veranstaltung
GeoSaxonia 2024
Datum
2024
DOI
10.48380/25t3-a560
Geolocation
Erzgebirge