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The behaviour of REEs in Thailand's Mae Klong estuary: Suggestions from the Y/Ho ratios and lanthanide tetrad effects (Articolo in rivista)
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- The behaviour of REEs in Thailand's Mae Klong estuary: Suggestions from the Y/Ho ratios and lanthanide tetrad effects (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
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- Censi P.; Sprovieri M.; Saiano F.;Di Geronimo S.I.; Larocca D.; Placenti F. (literal)
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- ISI Web of Science (WOS) (literal)
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- (1) Department of Geological Sciences, University of Catania, Corso Italia 55, 95129 Catania, Italy
(2) ITAF, University of Palermo, Viale delle Scienze 13, 90128 Palermo, Italy
(3) I.A.M.C.-CNR-Mazara del Vallo (TP), Via L. Vaccara 61, 91026 Mazara del Vallo, Italy
(4) I.A.M.C.-CNR-Calata Porta di Massa (Interno Porto di Napoli), 80133 Napoli, Italy (literal)
- Titolo
- The behaviour of REEs in Thailand's Mae Klong estuary: Suggestions from the Y/Ho ratios and lanthanide tetrad effects (literal)
- Abstract
- The concentrations of Rare Earth Elements and yttrium (REY) were measured in dissolved phase, in suspended particulate matter (SPM) and
in sediments in seven sampling stations in the Mae Klong estuarine system (Inner Thailand Gulf) in order to study their behaviour and distribution
pattern. The analysed samples generally show high Rare Earth Element (REE) content in the dissolved phase, with high Medium Rare
Earth Elements (MREEs) and Yenrichments in the shale-normalized pattern (versus PAAS). These chemical features are interpreted in terms of
direct influences of weathering processes of REE-rich minerals (e.g., phosphates), which abundantly out-crop in the Mae Klong watershed.
These large MREE enrichments also suggest that dissolved sulphate complexes play an important role in the dissolved REE fate close to the
marine coastal system. The shale normalized REEs and Y/Ho ratios additionally indicate a direct REY co-precipitation with Fe-oxyhydroxides
along the river path and consequent adsorption, as coating, onto FeOOH surfaces. The REY behaviour in SPM appears strongly influenced by Al,
Fe and Mn content, suggesting that the formation of an authigenic Fe, Mn oxyhydroxides and aluminosilicate particulate leads to REY adsorption
and/or co-precipitation. The observed variations in the Y/Ho ratios suggest that different YeHo fractionation processes take place in the
studied estuarine system. Strong similarities among chondrite-normalized REE patterns in both sediments and granitic rocks out-cropping in the
surrounding regions suggest a generic relationship between the two groups of materials. (literal)
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