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Refining the late Silurian sea-level history of the Prague Syncline—a case study based on the Přídolí GSSP (Czech Republic)

  • František Vacek
  • Ladislav Slavík
  • Katarzyna Sobień
  • Pavel Čáp
Original Article
  • 49 Downloads

Abstract

A 50-m-thick section in the Požáry quarry, Prague Syncline (Czech Republic) spanning the upper Silurian (uppermost Ludlow and Přídolí) to the lowermost Devonian (Lochkovian) has been studied using sedimentological and physical stratigraphical (gamma-ray spectrometry) methods combined with conodont biostratigraphy. Conodont data demonstrate the presence of local conodont biozones: “Ozarkodina” crispa (uppermost Ludlow)—Zieglerodina zellmeri (base of Přídolí)—Zieglerodina ivochlupaciDelotaxis detorta—“Ozarkodina” eosteinhornensis s.s.—Zieglerodina klonkensisIcriodus hesperius-optima (lowermost Lochkovian). The studied section represents a transgressive–regressive facies succession characterized by a transition from distal calciturbidites deposited in a distally steepened carbonate platform during transgression and sea-level highstand (crispa to lower ivochlupaci zones) to mixed calciturbidites/coarse-grained bioclastic limestones (falling-stage systems tract, upper ivochlupaci to lower klonkensis zones). The upper part of the succession consists of bioclastic limestones corresponding to a subtidal setting between storm-wave and fair-weather wave base (lowstand systems tract in upper klonkensis and hesperius-optima zones). This interpretation corresponds to the late Silurian global sea-level pattern as recorded in other regions. Thus the depositional system is interpreted as mostly driven by eustasy with short-lived periods of influence from local tectonics.

Keywords

Silurian Přídolí series Prague Syncline Gamma-ray spectrometry Carbonate microfacies Conodont biostratigraphy 

Notes

Acknowledgements

The authors are grateful to Leona Chadimová (Institute of Geology, Academy of Sciences) for valuable discussion. Jiřina Dašková and Jan Dašek (National Museum) are highly appreciated for their help during fieldwork. We gratefully acknowledge Michal Mergl and one anonymous reviewer for their constructive comments which improved the manuscript significantly. We also thank Axel Munnecke and Maurice Tucker for careful editorial handling. This paper was financially supported by project DKRVO 2018/03 (National Museum, 00023272) of the Ministry of Culture to FV. It was also supported by the Czech Science Foundation (project GA17-06700S “Přídolí Series in the Prague Synform—proposal for chronostratigraphic subdivision”) and the Research Plan of the Institute of Geology of the Czech Academy of Sciences (RVO67985831) to LS and Polish Geological Institute - National Research Institute project No. 61.3608.1102.00.0 to KS. It contributes to IGCP 652: Reading time in Paleozoic sedimentary rocks.

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Authors and Affiliations

  1. 1.National MuseumPraha 1Czech Republic
  2. 2.The Czech Academy of Sciences, Institute of GeologyPraha 6Czech Republic
  3. 3.Polish Geological Institute - National Research InstituteWarsawPoland
  4. 4.Czech Geological SurveyPraha 1Czech Republic

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