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Oxygen and carbon stable isotope records of the Lochkovian-Pragian boundary interval from the Prague Basin (Lower Devonian, Czech Republic)

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WEINEROVÁ Hedvika BÁBEK Ondřej SLAVÍK Ladislav VONHOF Hubert JOACHIMSKI Michael M. HLADIL Jindřich

Rok publikování 2020
Druh Článek v odborném periodiku
Časopis / Zdroj Palaeogeography, Palaeoclimatology, Palaeoecology
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://doi.org/10.1016/j.palaeo.2020.110036
Doi http://dx.doi.org/10.1016/j.palaeo.2020.110036
Klíčová slova Palaeozoic; Barrandian area; Climate changes; Conodont apatite; Carbonate; Diagenesis
Popis Climate changes close to the Lochkovian-Pragian Event are still widely discussed. Carbonate delta 18O and delta 13C and conodont apatite delta 18O from medial to distal carbonate ramp sediments were analysed to provide further stable isotope data from the stratotype area in the Prague Basin. The uppermost Silurian to lower Emsian delta 18O trends are put into an updated conodont biostratigraphy framework. Carbonate delta 18O and delta 13C are discussed in the context of facies-dependent diagenesis. The delta 13C pattern measured from different sections enables the correlation of intervals with development of different facies inside the Prague Basin. Positive delta 13C shifts are often coupled with trends of decreasing computed gamma-ray (CGR) values interpreted as regressions, whereas negative delta 13C shifts commonly coincide with opposite trends in CGR. The Lochkovian-Pragian boundary interval coincided with an increase in carbonate delta 13C and an increase in the delta 18O of conodont apatite and carbonate, which we interpret as consequence of climate cooling. Generally, the Lochkovian was warmer than the Pragian and earliest Emsian.
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