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Role of transtensional tectonics in the emplacement of Li-Sn granites in the Eastern Erzgebirge / Krušné hory

The Eastern Erzgebirge area boasts numerous significant Li-mica deposits associated with granite formations, such as the Zinnwald-Cinovec deposit. Over 90% of the documented Li-mica occurrences in the Erzgebirge are linked to late-stage intrusions (˜313-310 Ma) within the Altenberg-Teplice caldera system. This study investigates the influence of trans-tensional tectonics and the corresponding crustal-scale faults on the placement and spatial arrangement of small stock-like granitic intrusions within this caldera system. Examining fault patterns in the broader Altenberg-Teplice and Tharandt calderas, and the contemporaneous western Bohemian Carboniferous (Middle Pennsylvanian) basins, we identify a large-scale composite pull-apart structure. We propose a simple tectonic model involving various dilatant and transfer structures of secondary and tertiary orders, linking the primary Elbe Shear Zone in the northeast to the Pfahl or Danube shear zones in the southwest, to enable the formation of the largest Carboniferous pull-apart system in Bohemian Massif. Our model offers insight into the complex tectonic framework dictating the distribution and concentration of Li-rich peraluminous granites and associated Li-Sn greisen systems in the Erzgebirge region.

Details

Author
Jan Cerny1, Sam Thiele1, Marie Guilcher1, Mathias Burisch2, Uwe Lehmann3, Henrik Kaufmann3, Lutz Sonnabend3, Jens Gutzmer1
Institutionen
1Helmholtz-Zentrum Dresden-Rossendorf, Helmholtz Institute Freiberg for Resource Technology, Germany; 2Mineral Systems Analysis Group, Department of Geology and Geological Engineering, Colorado School of Mines, Golden, USA; 3Landesamt für Umwelt, Landwirtschaft und Geologie (LfULG), Freiberg, Germany
Veranstaltung
GeoSaxonia 2024
Datum
2024
DOI
10.48380/a6kn-fy24
Geolocation
Bohemian Massif - fault systems between Elbe and Danube shear zones.