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- W2186560107 abstract "Mesozoic sediments in Saxony are represented by few limited occurrences of Lower Triassic and Middle to Upper Jurassic deposits but mainly by Upper Cretaceous predominantly clastic units filling the Elbe Zone (Pietzsch 1963, Voigt & Troger in Niebuhr et al. 2007, Troger in Palchen & Walter 2008). The latter ones are confined by the Lausitz Block (part of the West-Sudetic Island) in the NE and the Erzgebirge (part of the Mid-European island) in the SW. The Upper Cretaceous sedimentation in the area of the Elbsandsteingebirge starts with the Upper Cenomanian marine transgression. Sediments of the Elbsandsteingebirge were deposited in marine environment in a narrow strait connecting northern cold Boreal water of N – NW Europe with the Tethyan warm-water areas in the S. The West-Sudetic Island (LausitzKrkonosze High) was the most possible source area for the Upper Cretaceous sediments of the Elbe Zone (Voigt 1994, Wilmsen 2011). Composition of sandstones and conglomerates indicate erosion and redeposition of older sediments which covered initially the basement of the Lausitz. We analysed six samples representing a 400 m thick sandstone succession (Schmilka, Postelwitz and Schrammstein formations) of Early Turonian to Early Coniacian age from the area around Schmilka (Elbsandsteingebirge) regarding their U/Pb-ages of detrital zircon grains. A significant change in the age spectra occurs from the Upper Turonian to the Lower Coniacian. We found a sudden input of Mesoand Palaeoproterozoic ages in the uppermost part of the Schmilka section that represent typical Baltica ages. As the whole region of northern Germany was covered by marine Cretaceous sediments, a direct input from Baltica (Scandinavia?) is impossible. Facies distribution and recent investigations suggest that during Middle Jurassic a major part of sandstones derived from uplifted parts of Paleoproterozoic and Mesoproterozoic units of Baltica. Therefore, we interpret the presented Coniacian age spectra as a signal of redeposited Middle Jurassic sandstones. Erosion of Jurassic sediments started not earlier than Early Coniacian (higher Schrammstein Formation, Sandstone e). The limited amount of ca. 540 Ma ages and predominance of variscan ages in all samples confirm covering of the Cadomian basement units of the Lausitz Block by Mesozoic sediments, originally derived from the Bohemian massif during the first depositional cycle. The basement rocks of the Lausitz Block were not available for erosion until at least Middle to Late Coniacian time. Further, our data confirm the inversion of the Lausitz Block relative to the Elbe Zone during Late Cretaceous time as already proposed by Voigt (1994)." @default.
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- W2186560107 date "2013-01-01" @default.
- W2186560107 modified "2023-09-27" @default.
- W2186560107 title "The Upper Cretaceous section at Schmilka in Saxony (Elbsandsteingebirge, Germany) - syntectonic sedimentation and inverted zircon age populations revealed by LA‑ICP‑MS U/Pb data Das Oberkreide‑Profil bei Schmilka in Sachsen (Elbsandsteingebirge, Deutschland) - syntektonische Sedimentation und inverse Zirkon‑Alterspopulationen offengelegt durch LA‑ICP‑MS U/Pb‑Daten" @default.
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