Abstract
The facies development through the stratigraphical interval of the Silurian (late Ludlow) Lau Event and the associated major δ13C record excursion have been studied in the Prague Basin. The investigated sections consist of temperate-water carbonates (Kopanina Formation) that were deposited in shallow as well as deeper parts of the basin. In both areas, the facies evolution reflects a major shallowing of sea-level during the early part of the event, which resulted in weathering (karstification) and erosion in the shallower parts of the basin, leading to stratigraphic gaps there. Paleokarst features and dolomitization are associated with these strata in the vicinity of Prague, where the δ13C record displays a strong diagenetic overprint and palynomorphs are very poorly preserved. A transition from deep-water shale to subtidal, thick-bedded limestone facies in the deeper parts of the basin, close to Kosov, signals the same sea-level drop, indicating that it was basin-wide. Detailed lithologic descriptions for the studied sections are provided and the development in the Prague Basin is compared with the coeval succession on Gotland, Sweden, which was located in the tropical realm at this times.
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Acknowledgments
The careful reviews by Thomas Suttner (Graz University, Austria), and Kathleen Histon (University of Modena, Italy) as well as the suggestions by the co-chief editor Maurice Tucker (Durham University, United Kingdom) significantly improved an earlier version of this paper. We thank Axel Munnecke (University of Erlangen, Germany) and Mikael Calner (Lund University, Sweden) for many constructive comments and discussions. We also want to thank Birgit Leipner-Mata for the preparation of excellent thin-sections and Marlies Neuffert for perfect overview and close-up photomicrographs (both from University of Erlangen, Germany). MG thanks Olda Fatka for providing lab facilities at the Charles University in Prague, and Jana Drábková and Alena Tichá for their extensive support with respect to the preparation of palynomorph samples and slides at the Czech Geological Survey in Barrandov. MG is indebted to LeHérissé (University of Brest, France) and L. Stricanne (University of Tübingen, Germany) for the identification of palynomorph taxa. The research of OL was supported by a grant of the Deutsche Forschungsgemeinschaft to Werner Buggisch from the Geozentrum Nordbayern, Erlangen (DFG grant BU 312/44-1) and by a grant from the Alexander von Humboldt Foundation to OL supporting a stay at the Czech Geological Survey in spring 2009. The manuscript was finished during the stay of OL at the Polish Academy of Sciences in Warsaw in the frame of the “Nachkontakt-Programm” of the Alexander von Humboldt Foundation (Bonn, Germany), and the support by the AvH is greatly acknowledged. This publication is a contribution to IGCP 591.
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Gocke, M., Lehnert, O. & Frýda, J. Facies development across the Late Silurian Lau Event based on temperate carbonates of the Prague Basin (Czech Republic). Facies 59, 611–630 (2013). https://doi.org/10.1007/s10347-012-0328-y
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DOI: https://doi.org/10.1007/s10347-012-0328-y