Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/25584

TitleRare-earth-element fractionation patterns in estuarine sediments as a consequence of acid mine drainage : a case study in SW Spain
Other titlesPatrones de fraccionamiento de tierras raras en sedimentos estuarinos como consecuencia del drenaje ácido de mina: estudio del SW de España
Author(s)López-González, N.
Borrego, J.
Carro, B.
Grande, J. A.
De la Torre, M. L.
Valente, Teresa Maria Fernandes
KeywordsAcid and saline mixing
Estuary
Mining
Rare-earth elements
Sediments
Issue date2012
PublisherInstituto Geológico y Minero de España (IGME)
JournalBoletín Geológico y Minero
CitationLópez-González, N., Borrego, J., Carro, B., Grande, J. A., De la Torre, M. L. and Valente, T., 2012. Rare-earth-element fractionation patterns in estuarine sediments as a consequence of acid mine drainage: A case study in SW Spain. Boletín Geológico y Minero, 123 (1): 55-64 ISSN: 0366-0176
Abstract(s)Processes of seawater dilution and acid neutralization cause significant effects upon REE fractionation between the aqueous solution and sediments. This study describes the results of a recent investigation into such processes in the sediments of the Tinto and Odiel estuary. The results show differences in behaviour between light REEs (LREEs) and middle and heavy REEs (MREEs and HREEs). A relative depletion in La is observed as a consequence of the low pH values, which prevents the separation of LREEs from solution to the suspended matter. When acid neutralization occurs, on the other hand, an increase in the La content is related to the preferential separation of LREEs compared to MREEs and HREEs. Under these conditions three main fractionation patterns were distinguished: the first shows a slightly MREE enriched shape in sediments deposited in the fluvial zone; the second displays significant depletion in LREEs and a nearly flat tendency in MREEs and HREEs towards the estuarine mixing zone; and the third is enriched in total REEs and shows a relative increase in LREEs and MREEs. The evolution of these patterns reveals that pH is the key variable controlling REE fractionation in environments affected by acid mine drainage.
TypeArticle
URIhttp://hdl.handle.net/1822/25584
ISSN0366-0176
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CIG-R - Artigos (Papers)

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