Rare earth elements in French stream waters - Revisiting the geochemical continental cycle using FOREGS dataset

Armand, Romain, Cherubini, Claudia, Tuduri, Johann, Pastore, Nicola and Pourret, Olivier (2015) Rare earth elements in French stream waters - Revisiting the geochemical continental cycle using FOREGS dataset. Journal of Geochemical Exploration, 157 132-142. doi:10.1016/j.gexplo.2015.06.006

Author Armand, Romain
Cherubini, Claudia
Tuduri, Johann
Pastore, Nicola
Pourret, Olivier
Title Rare earth elements in French stream waters - Revisiting the geochemical continental cycle using FOREGS dataset
Journal name Journal of Geochemical Exploration   Check publisher's open access policy
ISSN 0375-6742
Publication date 2015-10-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.gexplo.2015.06.006
Open Access Status Not Open Access
Volume 157
Start page 132
End page 142
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
The geochemical behavior of rare earth elements (REEs) has been investigated mainly in geological systems where these elements represent the best proxies of processes involving the occurrence of an interface between different media. This behavior is assessed according to REE concentrations recorded along the REE series normalized with respect to upper continental crust. In this study based on a field approach, the geochemical behavior of REE was investigated in French stream waters. This study is based on FOREGS (Forum of European Geological Surveys) Geochemical dataset that consists on a sampling at regular mesh on all Europe. In France, 119 stream water samples were extracted in drainage basins < 100 km2. The aim of the study is that of describing the spatial variation of REEs and finding the hydro-topo-geochemical factors that affect their distribution by means of a Multivariate Factorial Kriging.

On the basis of their atomic number and of the results of a preliminary Principal Component Analysis three REEs have been selected (La, Eu and Lu) and five physicochemical properties (pH, organic carbon, carbonates, Fe, Mn). A cokriging has been applied that shows a similar spatial organization of REEs: higher values are especially observed in the Aquitaine basin. In order to investigate more deeply on the different sources of variation acting in the study area, a factorial cokriging is applied. The first 2 regionalized factors have been estimated to give a synthetic description of the studied process at the different selected spatial scales. At higher spatial scales (250 km) environmental parameters like Fe, carbonates, and pH, supposed to be ascribed to the rock's nature or to other geological larger scale processes (i.e., hydrographic network and topography), have shown to affect REE distribution. At short range, only Eu and Mn weigh more, which are ascribed to the process of liberation of Mn oxides in rivers that also release the REEs sorbed onto these oxides.
Keyword Lanthanide
River water
Organic matter
Fe and Mn oxides
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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