Fractionation of rare earth elements within bone mineral: A natural cation exchange system

Détails

ID Serval
serval:BIB_CB6E8B85CC3B
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Fractionation of rare earth elements within bone mineral: A natural cation exchange system
Périodique
Palaeogeography, Palaeoclimatology, Palaeoecology
Auteur(s)
Trueman C.N., Kocsis L., Palmer M.R., Dewdney C.
ISSN-L
0031-0182
Statut éditorial
Publié
Date de publication
2011
Peer-reviewed
Oui
Volume
310
Pages
124-132
Langue
anglais
Résumé
The distribution of rare earth elements (REEs) within fossil bones is controlled by their partition coefficients between apatite and pore waters, and the rate of diffusion through the bone. Using simple theoretical models, we show that REEs are strongly fractionated from one another during diffusive transport and adsorption. Fractionation occurs due to the relative ease of substituting REE ions of differing ionic radius into the Ca sites in the apatite lattice, and the degree of fractionation is dependent on the rate of diffusion of ions within bone (and therefore the rate of recrystallisation). Variations in bone thickness, recrystallisation rate, and potentially pore water composition may all influence the relative distribution of REEs, and thus REE ratios within bones. Increases in bone thickness and reductions in either diffusion coefficients or the duration of REE uptake lead to enhanced fractionation of REEs in our model simulations. Interpretations of REE ratios in fossil bones either for palaeoenvironmental or taphonomic applications must consider how fractionation will influence REE ratios within bones, particularly when interpreting spatially resolved analyses within single bones. (C) 2011 Elsevier B.V. All rights reserved.
Création de la notice
15/09/2011 17:03
Dernière modification de la notice
20/08/2019 15:46
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