Journal
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
Volume 560, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.palaeo.2020.110036
Keywords
Palaeozoic; Barrandian area; Climate changes; Conodont apatite; Carbonate; Diagenesis
Funding
- Czech Science Foundation [14-18183S, 19-17435S, 17-06700S]
- Institute of Geology of the Czech Academy of Sciences [RVO 67985831]
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Climate changes close to the Lochkovian-Pragian Event are still widely discussed. Carbonate delta O-18 and delta C-13 and conodont apatite delta O-18 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 O-18 trends are put into an updated conodont biostratigraphy framework. Carbonate delta O-18 and delta C-13 are discussed in the context of facies-dependent diagenesis. The delta C-13 pattern measured from different sections enables the correlation of intervals with development of different facies inside the Prague Basin. Positive delta C-13 shifts are often coupled with trends of decreasing computed gamma-ray (CGR) values interpreted as regressions, whereas negative delta C-13 shifts commonly coincide with opposite trends in CGR. The Lochkovian-Pragian boundary interval coincided with an increase in carbonate delta C-13 and an increase in the delta O-18 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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