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Zircon U-Pb CA-ID-TIMS constraints on the chronology of the Variscan intramontane Döhlen Basin and its correlation with the Thuringian Forest Basin (central and eastern Germany)

The early post-Variscan evolution of central Europe was characterized by the formation of numerous volcano-sedimentary Rotliegend (Late Carboniferous–early Permian) basins. Recent dating attempts in the Thuringian Forest Basin have shown that the precision and accuracy of zircon CA-ID-TIMS dating (< 0.1 %) is crucial to discriminate the sedimentation ages of successive formations. The correlation between different basins will be most successful by a combination of high-precision age dating with the existing extensive knowledge about biostratigraphic correlations.

Here, we present new zircon U-Pb CA-ID-TIMS data of three volcanic rocks from the Unkersdorf, Niederhäslich, and Bannewitz formations of the Döhlen Basin (Saxony, Germany) and of two tuff samples of the Manebach and the Goldlauter formations of the Thuringian Forest Basin (Thuringia, Germany). Our data indicate that all four formations of the Döhlen Basin were deposited during ≤ 1.8 Myr and are within errors coeval with the Manebach and Goldlauter formations of the Thuringian Forest Basin. The Niederhäslich Formation of the Döhlen Basin and the Manebach and Goldlauter formations of the Thuringian Forest Basin contain fossil-rich lacustrine horizons, which have been correlated to a variety of formations in other European basins through the use of insect, amphibian, or conchostracan assemblage zones. Our new data thus provide new absolute age constraints for different fossil assemblage zones, and thereby can be extrapolated to other basins in central Europe.

Details

Author
Alexandra Käßner1, Marion Tichomirowa1, Ronny Rößler2, Ines Görz3
Institutionen
1Institut für Mineralogie, TU Bergakademie Freiberg, Germany; 2Museum für Naturkunde Chemnitz, Germany; 3Sächsisches Landesamt für Umwelt, Landwirtschaft und Geologie, Freiberg, Germany
Veranstaltung
GeoSaxonia 2024
Datum
2024
DOI
10.48380/yjja-km41