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• W2024459667 abstract "Abstract In addition to Oceanic Anoxic Event 2 (OAE2), other perturbations of the carbon cycle occurred during the Cenomanian and Turonian, of which the Middle Cenomanian Event (MCE) is the most prominent one. In palaeoecological publications, however, this event is strongly underrepresented in contrast to the well-studied OAE2. In order to fill this gap, we have studied Early Cenomanian to Late Turonian calcareous nannofossil and benthic foraminiferal assemblages of Ocean Drilling Program Site 1260 at Demerara Rise (western equatorial North Atlantic), in order to decipher biotic changes throughout this interval and especially across the MCE. Our data show distinctive changes in the relative abundance of certain calcareous nannofossil taxa and a drastic decrease in benthic foraminiferal diversities and abundances associated with the MCE. In the lower part of the studied section and prior to the MCE, a mixed water-column with high nutrient availability in the upper photic zone is suggested based on very high relative abundances of the mesotrophic/eutrophic nannofossil species Biscutum constans. Around the MCE interval, certain nannofossil taxa (e.g., Rhagodiscus asper) show a distinctive decrease in relative abundance while others become more dominant. Taxa which increase in relative abundance after the MCE (e.g., Eprolithus floralis) are interpreted as either having favoured less eutrophic surface-waters or having inhabited deeper parts of the photic zone in a well stratified water-column. This interpretation is supported by published oxygen isotope and TEX86 data, which suggest increased water-column stratification starting with the MCE and lasting to the end of the Cenomanian stage, as a result of the implementation of a saline intermediate- to deep-water mass during this interval. Our study shows that the MCE was a significant biotic event in the Cenomanian/Turonian equatorial Atlantic, characterised by a lasting change of surface- and bottom-water ecosystems." @default.
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• W2024459667 date "2012-12-01" @default.
• W2024459667 modified "2023-09-27" @default.
• W2024459667 title "The Middle Cenomanian Event in the equatorial Atlantic: The calcareous nannofossil and benthic foraminiferal response" @default.
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• W2024459667 doi "https://doi.org/10.1016/j.marmicro.2012.08.003" @default.
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