Radiocarbon dating of urban secondary carbonate deposit: site effect and implication for chronology - ExPRES : Eau x Pollution, Ressources, Environnements et Sols Accéder directement au contenu
Article Dans Une Revue Radiocarbon Année : 2022

Radiocarbon dating of urban secondary carbonate deposit: site effect and implication for chronology

Gael Monvoisin

Résumé

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 ( 14 C 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.
Fichier principal
Vignette du fichier
radiocarbon-dating-of-urban-secondary-carbonate-deposits-site-effect-and-implication-for-chronology-case-study-of-paris-and-versailles-palace-fountains.pdf (645.33 Ko) Télécharger le fichier
Origine : Publication financée par une institution
licence : CC BY - Paternité

Dates et versions

hal-03918048 , version 1 (13-10-2023)

Identifiants

Citer

Edwige Pons-Branchu, Ingrid Caffy, Emmanuelle Delque-Količ, Jean-Pascal Dumoulin, Emmanuel Dumont, et al.. Radiocarbon dating of urban secondary carbonate deposit: site effect and implication for chronology: Case study of Paris and Versailles Palace fountains. Radiocarbon, 2022, 64 (6), pp.1323-1332. ⟨10.1017/RDC.2022.78⟩. ⟨hal-03918048⟩
79 Consultations
43 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More