Hydrological disparity of the Lutetian Paris and Hampshire basins revealed by stable isotopes of conid gastropods

Alexander J. Clark, J. Vellekoop, R. Speijer
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Abstract

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 δ18O 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 suggests 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 a 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 δ18O values of the Hampshire Basin specimens are consistently lower than those in the Paris Basin, suggesting a regional difference in δ18Osw of 1-2‰ between the basins. This difference in δ18Osw was likely related to a hydrological disparity between the Paris and Hampshire basins.
松果腹足类稳定同位素揭示的巴黎和汉普尔盆地的水文差异
始新世温室期(56.0 ~ 33.9 Ma),西北欧以半干旱的准热带气候为主,古水文条件鲜为人知。为了更深入地了解该地区的季节水文条件,我们比较了英吉利海峡两侧的两个浅海盆地(即巴黎盆地和汉普郡盆地)的Lutetian(中始新世,~44-45 Ma)软体动物δ18O记录。半圆形的巴黎盆地向大西洋开放,而汉普郡盆地则更封闭,受到几条河流的排水影响。这些盆地的邻近表明它们经历了大致相似的海水温度,但预计这些盆地之间的季节性水文是不同的。在这两个盆地中存在的众多软体动物中,有几个是孢子科的成员,这是一种腹足类动物,特别适合于古季节重建。为了评估这些盆地之间的古水文差异,我们分析了来自法国巴黎盆地Calcaire Grossier组中部Banc a Verrains的三个Eoconus deperditus标本和来自英国Hampshire盆地Selsey组上部Shepherd 's Gutter河床的三个Eoconus edwardsi标本的稳定氧同位素组成。虽然这些盆地之间的季节变化相似,但汉普郡盆地样品的δ18O值始终低于巴黎盆地,表明盆地之间的δ18O值存在1 ~ 2‰的区域差异。这种δ18Osw的差异可能与巴黎盆地和汉普郡盆地之间的水文差异有关。
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