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RADIOCARBON DATING OF URBAN SECONDARY CARBONATE DEPOSITS: SITE EFFECT AND IMPLICATION FOR CHRONOLOGY: CASE STUDY OF PARIS AND VERSAILLES PALACE FOUNTAINS

Published online by Cambridge University Press:  06 December 2022

Edwige Pons-Branchu*
Affiliation:
Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris Saclay, Gif-sur-Yvette, France
Ingrid Caffy
Affiliation:
Laboratoire de Mesure du Carbone 14 (LMC14), LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
Emmanuelle Delque-Kolic
Affiliation:
Laboratoire de Mesure du Carbone 14 (LMC14), LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
Jean-Pascal Dumoulin
Affiliation:
Laboratoire de Mesure du Carbone 14 (LMC14), LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
Emmanuel Dumont
Affiliation:
CEREMA : TEAM - 12 Rue Teisserenc de Bort, 78197 TRAPPES-en-Yvelines Cedex ; and Rue de l’Egalité Prolongée – BP 134, 93352, Le Bourget Cedex 319, France
Sarah Madikita
Affiliation:
Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris Saclay, Gif-sur-Yvette, France
Gilles Bultez
Affiliation:
Château de Versailles : Etablissement Public du château, du musée et du domaine national de Versailles. RP 834 – 78008, Versailles Cedex, France
Daniella Malnar
Affiliation:
Château de Versailles : Etablissement Public du château, du musée et du domaine national de Versailles. RP 834 – 78008, Versailles Cedex, France
Gael Monvoisin
Affiliation:
Laboratoire GEOPS, Université. Paris Saclay – UMR 8148 CNRS – Université Paris Saclay, 91405, Orsay Cedex, France
Jules Querleux
Affiliation:
IGC, Inspection générale des Carrières – 86 rue Regnault, 75013, France
Matthieu Fernandez
Affiliation:
Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris Saclay, Gif-sur-Yvette, France Laboratoire histoire des technosciences en société, EA3716, Conservatoire national des arts et métiers, 2 rue Conté 75003, Paris, France
Nadine Tisnérat Laborde
Affiliation:
Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris Saclay, Gif-sur-Yvette, France
Philippe Branchu
Affiliation:
CEREMA : TEAM - 12 Rue Teisserenc de Bort, 78197 TRAPPES-en-Yvelines Cedex ; and Rue de l’Egalité Prolongée – BP 134, 93352, Le Bourget Cedex 319, France
*
*Corresponding author. Email: edwige.pons-branchu@lsce.ipsl.fr

Abstract

In urban environments, diachronic evolution of water quality can be reconstructed using geochemical analysis of urban secondary carbonate deposits (USCDs), from urban underground structures, similar to speleothems from natural caves. The use of the radiocarbon bomb peak to build their precise chronology was recently tested in two Paris-area urban sites (France). In this study, new samples from contrasted environments in the Paris region were sampled in order to test the sites’ effects on the radiocarbon signal recorded: under wood, under a fountain, in underground aqueducts, in the south and north of Paris. We compared the post-bomb atmospheric radiocarbon record with the one measured at the top of USCDs, and estimated the dead carbon proportion (DCP), between 0 and 40%. USCDs fed by water with a rapid transfer through thin soil (Versailles fountain) had the lowest DCP (14C very close to atmospheric one). Highest DCP were found for USCD from deep underground quarry under urban wood, and intermediate ones for USCDs fed by the waters of perched aquifers. These data support the use of radiocarbon as chronometer for USCDs in contrasted urban contexts, and show that it can be used to determine carbon transport and sources, an important parameter for pollution reconstruction.

Type
Conference Paper
Copyright
© The Author(s), 2022. Published by Cambridge University Press for the Arizona Board of Regents on behalf of the University of Arizona

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Footnotes

Selected Papers from the 3rd Radiocarbon in the Environment Conference, Gliwice, Poland, 5–9 July 2021

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