Response of foraminiferal assemblages to precession-paced environmental variation in a mid-latitude seaway: Late Turonian greenhouse of Central Europe

0546541 - GFÚ 2022 RIV NL eng J - Článek v odborném periodiku
Chroustová, M. - Holcová, K. - Laurin, Jiří - Uličný, David - Hradecká, L. - Hrnková, M. - Čech, S. - Hrouda, F. - Jarvis, I.
Response of foraminiferal assemblages to precession-paced environmental variation in a mid-latitude seaway: Late Turonian greenhouse of Central Europe.
Marine Micropaleontology. Roč. 167, August (2021), č. článku 102025. ISSN 0377-8398. E-ISSN 1872-6186
Grant CEP: GA ČR(CZ) GA17-10982S
Institucionální podpora: RVO:67985530
Klíčová slova: Upper Cretaceous * Bohemian Cretaceous Basin * Milankovitch cycles * Si/Al-ratio * planktic and benthic foraminifera * epicontinental sea
Obor OECD: Geology
Impakt faktor: 2.102, rok: 2021
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/abs/pii/S0377839821000669

Foraminiferal assemblages were studied as part of a multi-proxy dataset from an expanded record of Late Turonian hemipelagic deposition obtained from the Bch-1 research borehole in the Bohemian Cretaceous Basin (Central Europe). Based on fluctuations in the Si/Al ratio, precession-paced cyclicity (18-23 kyr) is recognized in the studied interval and interpreted to reflect changes in seasonality. This study focuses on relationships between the astronomically controlled lithological cyclicity and the composition of foraminifera assemblages, together with variation in other parameters (geochemical, geophysical, palynological) that may provide further information about palaeoenvironmental change on a precession time scale. Spearman correlation enables the foraminiferal assemblages to be divided into three clusters. These clusters are interpreted to reflect palaeoenvironmental patterns that result from variation in nutrient supply and in surface water salinity, driven by changes in seasonality. The Lenticulina - Gyroidinoides - agglutinated foraminifera cluster dominated during periods of decreased seasonality and alternated with the Cibicides - spiral unkeeled planktics cluster (lower part of study interval) or the Gavellinela - Praebulimina - spiral keeled + biserial planktics cluster (upper part of study interval) coincident with the presumed seasonality maxima. Replacement of the Gavelinella cluster by the Cibicides cluster may reflect a longer-term trend of seasonality changes or changes in food supply. The observed low foraminiferal abundance and low planktic/benthic ratio during the seasonality maxima indicates that these were times of more intense rainfall, increased elastic supply and surface water turbidity, and more pronounced salinity fluctuations.
Trvalý link: http://hdl.handle.net/11104/0323026