New CA-ID-TIMS U–Pb zircon ages for the Altenberg–Teplice Volcanic Complex (ATVC) document discrete and coeval pulses of Variscan magmatic activity in the Eastern Erzgebirge (Eastern Variscan Belt)

Abstract The Altenberg–Teplice Volcanic Complex (ATVC) is a large ~ NNW–SSE trending volcano-plutonic system in the southern part of Eastern Erzgebirge (northern Bohemian Massif, south-eastern Germany and northern Czech Republic). This study presents high precision U–Pb CA-ID-TIMS zircon ages for pre-caldera volcano-sedimentary Schönfeld–Altenberg various rocks caldera stage: Teplice rhyolite, microgranite ring dyke, Sayda-Berggießhübel dyke swarm. These data revealed prolonged time gap ca. 7–8 Myr between stage (Schönfeld–Altenberg Complex) climactic stage. volcanic represent earliest activity central Europe at 322 Ma. subsequent rhyolite was formed during relatively short interval only 1–2 (314–313 Ma). During same Ma), intruded rim structure. In addition, one Sayda-Berggiesshübel swarm dated 314 Ma, while another yielded younger age (ca. 311 confirm close genetic temporal relationship (at least of) Remarkably, formation south (caldera ATVC: 314–313 Ma) that north (Tharandt Forest caldera: 314–312 occurred time. document 60 km magmatic whole Erzgebirge. For first time, Hf-O-isotope acquired on from ATVC to better characterize its possible sources. homogeneous require preceding homogenization basement rocks. Some small-scale melts were produced Variscan amphibolite-facies metamorphism show similar characteristics can therefore be considered as most probable source melt. second with low oxygen isotope ratios (e.g. basic rocks) probably contributed melt possibly triggered eruption well crystal-rich intrusion dyke.