TY  - JOUR
A1  - Tichomirowa, Marion
A1  - Käßner, Alexandra
A1  - Repstock, Alexander
A1  - Weber, Sebastian
A1  - Gerdes, Axel
A1  - Whitehouse, Martin J.
T1  - 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)
T2  - International journal of earth sciences
N2  - The Altenberg–Teplice Volcanic Complex (ATVC) is a large ~ NNW–SSE trending volcano-plutonic system in the southern part of the 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 the pre-caldera volcano-sedimentary Schönfeld–Altenberg Complex and various rocks of the caldera stage: the Teplice rhyolite, the microgranite ring dyke, and the Sayda-Berggießhübel dyke swarm. These data revealed a prolonged time gap of ca. 7–8 Myr between the pre-caldera stage (Schönfeld–Altenberg Complex) and the climactic caldera stage. The volcanic rocks of the Schönfeld–Altenberg Complex represent the earliest volcanic activity in the Erzgebirge and central Europe at ca. 322 Ma. The subsequent Teplice rhyolite was formed during a relatively short time interval of only 1–2 Myr (314–313 Ma). During the same time interval (314–313 Ma), the microgranite ring dyke intruded at the rim of the caldera structure. In addition, one dyke of the Sayda-Berggiesshübel dyke swarm was dated at ca. 314 Ma, while another yielded a younger age (ca. 311 Ma). These data confirm the close genetic and temporal relationship of the Teplice rhyolite, the microgranite ring dyke, and (at least part of) the Sayda-Berggießhübel dyke swarm. Remarkably, the caldera formation in the south of the Eastern Erzgebirge (caldera stage of ATVC: 314–313 Ma) and that in the north (Tharandt Forest caldera: 314–312 Ma) occurred during the same time. These data document a large ~ 60 km NNW–SSE trending magmatic system in the whole Eastern Erzgebirge. For the first time, Hf-O-isotope zircon data was acquired on the ring dyke from the ATVC rocks to better characterize its possible sources. The homogeneous Hf-O-isotope zircon data from the microgranite ring dyke require preceding homogenization of basement rocks. Some small-scale melts that were produced during Variscan amphibolite-facies metamorphism show similar Hf-O-isotope characteristics and can therefore be considered as the most probable source for the microgranite ring dyke melt. In addition, a second source with low oxygen isotope ratios (e.g. basic rocks) probably contributed to the melt and possibly triggered the climactic eruption of the Teplice rhyolite as well as the crystal-rich intrusion of the ring dyke.
KW  - CA-ID-TIMS zircon dating
KW  - Erzgebirge
KW  - Variscan belt
KW  - Altenberg–Teplice Volcanic Complex
KW  - Carboniferous volcanism
KW  - Upper crustal magmatic system
Y1  - 2022
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/69763
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-697637
SN  - 1437-3262
N1  - Open Access funding enabled and organized by Projekt DEAL.
N1  - We thank the Saxon Geological Survey for financial support and the Isotope Research Centre in St. Petersburg (Russia) for SHRIMP measurements. The NordSIMS facility was supported by Swedish Research Council infrastructure grant 2017-00671 at the time of analysis; this is NordSIMS contribution 711.
VL  - 111
IS  - 6
SP  - 1885
EP  - 1908
PB  - Springer
CY  - Berlin ; Heidelberg
ER  -