STARDUST II - Spatial and Temporal Assessment
of high Resolution Depth profiles Using novel Sampling Technologies The fate of pollutants in fluvial and marine sediments in cross-border zones
Hydrological differences between the Lutetian Paris and Hampshire basins revealed by stable isotopes of conid gastropods
Clark, A.J.; Vellekoop, J.; Speijer, R.P. (2022). Hydrological differences between the Lutetian Paris and Hampshire basins revealed by stable isotopes of conid gastropods. Bull. Soc. Géol. Fr. 193: 3. https://dx.doi.org/10.1051/bsgf/2022002
In: Bulletin de la Société Géologique de France. Société Géologique de France: Paris. ISSN 0037-9409; e-ISSN 1777-5817
During the Eocene greenhouse (56.0–33.9?Ma), northwest Europe was dominated by a semi-arid para-tropical climate but the paleohydrological conditions are poorly known. To gain more insight into seasonal hydrological conditions in the region, we compare Lutetian (middle Eocene, ~?44–45?Ma) mollusk d18O records from two shallow marine basins on either side of the English Channel, i.e., the Paris and Hampshire Basins. The semi-circular Paris Basin was open to the Atlantic Ocean, while the Hampshire Basin was more enclosed and influenced by the draining of several rivers. The proximity of the basins and the similarity of their faunal assemblages suggest that they experienced roughly similar seawater temperatures but the seasonal hydrology is expected to have been different between these basins. Among the numerous mollusks present in both basins are several members of Conidae, a gastropod family that is particularly well-suited for paleoseasonality reconstructions. To assess the paleohydrological differences between these basins we analyzed the stable oxygen isotopic composition of three specimens of Eoconus deperditus from the Banc à Verrains in the middle part of the Calcaire Grossier Formation of the Paris Basin (France), and three specimens of Eoconus edwardsi from the Shepherd’s Gutter Bed in the upper part of the Selsey Formation of the Hampshire Basin (United Kingdom). While the seasonal variability appears to have been similar between these basins, the d18O values of the Hampshire Basin specimens are consistently lower than those in the Paris Basin, suggesting a regional difference in d18Osw of 1–2‰ between the basins. This difference in d18Osw was likely related to the greater influence of fluvial discharge within the Hampshire basin, compared to the Paris Basin.
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STARDUST II is a project funded by the INTERREG III A programme (France/Walloon Region/Flanders
French-Flemish subprogramme) of the European Community's Regional Development Fund.
Hosted by the Flanders Marine Institute (VLIZ)
