New 40Ar/39Ar eruption ages of Meso- to Cenozoic volcanoes in the Northern Bohemian Massif
The Ohře/Eger Graben (OEG) marks one of the important spots of the Mesozoic to Cenozoic rift-related volcanic activity in central Europe, and extends over a length of more than 250 km. Here, the volcanic edifices comprise monogenetic maar-diatremes, scoria cones, and lava domes as well as large polygenetic stratovolcanoes. Their composition ranges between melilitite, nephelinite, basanite, and phonolite. It is precisely the northern flank of the OEG, where the timing of eruption has been sporadically dated with outdated methods.
Recent 40Ar/39Ar age analysis has provided new insights, revealing a chronological sequence spanning from 77 to 10 Ma and reshaping our understanding of eruption dynamics in the northern OEG rift structure. The oldest volcanics are melilite-bearing rocks with ages of around 77 to 65 Ma. With eruption ages at 10 Ma, the nephelinitic Landsberg and Buchhübel, as well as the basanitic Ascherhübel of the western Elbe Zone are the youngest volcanoes from the northern rift flank. Volcanoes of the Erzgebirge and Lusatia erupted between 37 and 29 Ma and 35 to 26 Ma, respectively. The age determination of the Vogtland yields younger ages at 30 to 23 Ma.
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Author
Jörg Büchner1, Alexander Repstock2, Hripsime Gevorgyan3, Masafumi Sudo4, Lothar Viereck5, Olaf Tietz1, Sebastian Weber2Institutionen
1Senckenberg Museum für Naturkunde Görlitz, Germany; 2Section Geological Survey and Geophysics, Saxon State Office for Environment, Agriculture and Geology; 3Institute for Mineralogy, TU Bergakademie Freiberg; 4Institute of Geosciences, University of Potsdam, Germany; 5Institut für Geowissenschaften, Friedrich Schiller Universität JenaVeranstaltung
GeoSaxonia 2024Datum
2024DOI
10.48380/tgg5-1021Geolocation
Bohemian Massif
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