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CORE DOCUMENTATION AND CORRELATION IN THE TURONIAN (UPPER CRETACEOUS) OF THE URANIUM DEPOSIT KÖNIGSTEIN (ELBSANDSTEINGEBIRGE)

The remediation of the former uranium deposit site Königstein faces the problem to restore the groundwater level to its original state, because the uranium was leached with sulfuric acid from a Cenomanian paleovalley. For the management and monitoring of the groundwater level rise, a precise hydrogeological model is necessary. The former mine is situated in the facies transition from marine shelf sandstones (aquifers) interfingering with aquitards of pelitic units, deposited in a more distal environment. Sea-level changes controlled the depositional architecture. Detailed documentation and correlation of 39 cores urge for revising established lithostratigraphic concepts in the Elbsandsteingebirge area. The marginal sandstones of the Turonian Schmilka-, Postelwitz- and Schrammstein formations are very homogeneous. The correlation of the boreholes is therefore supported by the correlation of episodic major stormbeds. Both progradational and retrogradational patterns are observed in the clastic succession. Towards the northeastern source area, marl and clay units of the lamarcki- and labiatus- Pläner are reduced in thickness or pinch out completely. We observe a rapid switch between sandy and marly beds in the transition zones between the lithostratigraphic units, impeding lateral correlations with the sandstones, but allowing a sequence stratigraphic approach. Locally, a direct onlap of Turonian sediments on Paleozoic basement is observed, caused by the progressive sedimentary fill of the paleovalley. The stratigraphic framework will provide the base for a 3D-subsurface model.

Details

Author
Mark Mücklisch1, Thomas Voigt1
Institutionen
1Friedrich-Schiller-Universität Jena, Germany
Veranstaltung
GeoSaxonia 2024
Datum
2024
DOI
10.48380/thkn-qm57