NDLI: Middle Lutetian climate in the Paris Basin: implications for a marine hotspot of paleobiodiversity

Content Provider	Springer Nature Link
Author	Huyghe, Damien Merle, Didier Lartaud, Franck Cheype, Emilie Emmanuel, Laurent
Copyright Year	2012
Abstract	The present study reports the evolution of environmental conditions and seawater temperatures during the establishment of a marine hotspot of paleobiodiversity that took place in the Paris Basin during the Lutetian. The stable isotope compositions (δ18O and δ13C) of three species of molluscs (two bivalves: Cubitostrea plicata and Venericardia imbricata, and one gastropod: Sigmesalia multisulcata) collected along the reference section of Grignon (Falunière) are used for paleoenvironmental and paleoclimatic reconstructions. Additional high-resolution analyses on one specimen of Haustator imbricatarius allow the documentation of seasonal changes for temperature. The high-resolution profiles of the δ18O signatures of S. multisulcata reveal that these gastropods mineralized their shell during the warm months of the year, as did V. imbricata, which probably had a short life span (less than 1 year). These two species thus only yield temperatures for the summer period, from 22 to 30 °C. The δ18O of C. plicata shells indicate mean annual sea surface temperatures ranging between 15 and 23 °C during the Middle Lutetian, with minimal temperatures probably reflecting greater depth at the base of the section. The seasonal contrasts reconstructed in the upper part of the section, from the large gastropod H. imbricatarius, ranged between 18 and 30 °C. Comparison of the isotopic values of the species indicates that the δ13C of the three taxa seems to be mostly influenced by ecological features, leading to differences between endobenthic (V. imbricata) and epibenthic species (C. plicata); or the food habits. The paleoclimatic reconstructions show that the Lutetian climate was relatively stable in the Paris Basin with long-term cooling of the mean annual sea-surface temperatures. Nevertheless, this study shows that despite a context of colder conditions compared to the Early Eocene, the climate provided a favorable context for the increase of marine biodiversity in the Paris Basin during the Middle Lutetian.
Starting Page	587
Ending Page	604
Page Count	18
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	58
Issue Number	4
e-ISSN	16124820
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-04-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lutetian Paris Basin Molluscs Climate Stable isotopes Paleobiodiversity Ecology Geochemistry Paleontology Biogeosciences Sedimentology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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