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@article{1411396,
author = {Kopecká, Jitka and Holcová, Katarina and Nehyba, Slavomír and Hladilová, Šárka and Brzobohatý, Rostislav and Bitner, Maria Aleksandra},
article_location = {Warszawa},
article_number = {1},
doi = {http://dx.doi.org/10.7306/gq.1398},
keywords = {Middle Miocene-Central Paratethys-siliciclastic sedimentation-carbonate sedimentation- large benthic foraminifera-palaeoecology},
language = {eng},
issn = {1641-7291},
journal = {Geological Quarterly},
title = {The earliest Badenian Planostegina bloom deposit: reflection of an unusual environment in the westernmost Carpathian Foredeep (Czech Republic)},
url = {http://dx.doi.org/10.7306/gq.1398},
volume = {62},
year = {2018}
}
TY - JOUR
ID - 1411396
AU - Kopecká, Jitka - Holcová, Katarina - Nehyba, Slavomír - Hladilová, Šárka - Brzobohatý, Rostislav - Bitner, Maria Aleksandra
PY - 2018
TI - The earliest Badenian Planostegina bloom deposit: reflection of an unusual environment in the westernmost Carpathian Foredeep (Czech Republic)
JF - Geological Quarterly
VL - 62
IS - 1
SP - 18-37
EP - 18-37
PB - Polish Geological Institute
SN - 16417291
KW - Middle Miocene-Central Paratethys-siliciclastic sedimentation-carbonate sedimentation- large benthic foraminifera-palaeoecology
UR - http://dx.doi.org/10.7306/gq.1398
N2 - The Miocene sedimentation history of the Brus denudation relict (the western part of the Carpathian Foredeep, Czech Republic) has been inferred from 20 m of silt/siltstones, sand/sand stones and limestones penetrated by the Brus-1 borehole. Detailed multiproxy lithofacies and biofacies analyses have allowed facies and palaeoenvironment interpretations. The presence of molluscs, brachiopods and fish fauna, as well as large benthic and epiphytic foraminifera indicates a generally shallow, subtropical, marine environment. Despite the scarcity of biostratigraphical markers, the section can be correlated with the lower most Badenian (~15–16 Ma). In the siltstones in the lower part of the borehole, there are abundant low-salinity foraminifera, which may indicate increased rain fall. Linked to this is the nutrient enrichment of the sea bottom water inferred from the presence of the high-nutrient taxa accompanied by abundant calcareous nannoplankton eutrophic taxa such as Coccolithus pelagicus and eutrophic planktonic foraminifera of the Globigerina bulloides/praebulloides group. The main Planostegina bloom was recorded in a sandstone in the interval 12.5–7 m, and was not influenced by a shift from high-organic content Valvulineria assemblage of small foraminifera to an epiphytic one. The boundary between siliciclastic and carbonate sedimentation (7.5 m) shows a drop in K and Th concentrations, and in the Th/U ratio, but a rise in the Th/K ratio. This change in radioactive element content may generally indicate a significant decrease in terrestrial sediment input which is further supported by the on set of limestone deposition. Reversal of the deposition regime and a decrease of clastic input into the basin may be related to the changing of the precipitation régime, probably triggered by orbitally-forced cyclicity.
ER -
KOPECKÁ, Jitka, Katarina HOLCOVÁ, Slavomír NEHYBA, Šárka HLADILOVÁ, Rostislav BRZOBOHATÝ a Maria Aleksandra BITNER. The earliest Badenian Planostegina bloom deposit: reflection of an unusual environment in the westernmost Carpathian Foredeep (Czech Republic). \textit{Geological Quarterly}. Warszawa: Polish Geological Institute, 2018, roč.~62, č.~1, s.~18-37. ISSN~1641-7291. Dostupné z: https://dx.doi.org/10.7306/gq.1398.
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