Marine Science Faculty Publications
A Coupled Riverine-Marine Fractionation Model for Dissolved Rare Earths and Yttrium
Document Type
Article
Publication Date
1998
Keywords
Rare earth, Rare earth, fractionation, model, riverine, oceanic, estuarine
Digital Object Identifier (DOI)
https://doi.org/10.1023/A:1009651919911
Abstract
Fractionation of yttrium (Y) and the rare earth elements (REEs) begins in riverine systems and continues in estuaries and the ocean. Models of yttrium and rare earth (YREE) distributions in seawater must therefore consider the fractionation of these elements in both marine and riverine systems. In this work we develop a coupled riverine/marine fractionation model for dissolved rare earths and yttrium, and apply this model to calculations of marine YREE fractionation for a simple two-box (riverine/marine) geochemical system. Shale-normalized YREE concentrations in seawater can be expressed in terms of fractionation factors (λ ij ) appropriate to riverine environments ( $$\lambda _{ij}^{river}$$ ) and seawater ( $$\lambda _{ij}^{ocean}$$ ): $$\log \frac{{\left( {M_i } \right)_T^{ocean} }}{{\left( Y \right)_T^{ocean} }} = log\;\lambda _{ij}^{ocean} + ((\lambda _{ij}^{river} )^{ - 1} - 1)\;log\frac{{[Y]_T^{river} }}{{[Y^0 ]_T^{river} }}$$ where $$\left( {M_i } \right)_T^{ocean}$$ and $$\left( Y \right)_T^{ocean}$$ are input-normalized total metal concentrations in seawater and $$[Y]_T^{river} /[Y^0 ]_T^{river}$$ is the ratio of total dissolved Y in riverwater before $$([Y^0 ]_T^{river} )$$ and after $$([Y]_T^{river} )$$ commencement of riverine metal scavenging processes. The fractionation factors (λ ij ) are calculated relative to the reference element, yttrium, and reflect a balance between solution and surface complexation of the rare earths and yttrium.
Was this content written or created while at USF?
Yes
Citation / Publisher Attribution
Aquatic Geochemistry, v. 4, p. 103-121
Scholar Commons Citation
Byrne, Robert H. and Liu, Xuewu, "A Coupled Riverine-Marine Fractionation Model for Dissolved Rare Earths and Yttrium" (1998). Marine Science Faculty Publications. 1716.
https://digitalcommons.usf.edu/msc_facpub/1716
