The behaviour of the rare earth elements during estuarine mixing-revisited

Lawrence, Michael G. and Kamber, Balz S. (2006) The behaviour of the rare earth elements during estuarine mixing-revisited. Marine Chemistry, 100 1-2: 147-161. doi:10.1016/j.marchem.2005.11.007

Author Lawrence, Michael G.
Kamber, Balz S.
Title The behaviour of the rare earth elements during estuarine mixing-revisited
Journal name Marine Chemistry   Check publisher's open access policy
ISSN 0304-4203
Publication date 2006
Sub-type Article (original research)
DOI 10.1016/j.marchem.2005.11.007
Volume 100
Issue 1-2
Start page 147
End page 161
Total pages 15
Place of publication Amsterdam, Netherlands
Publisher Elsevier Science BV
Collection year 2006
Language eng
Subject C1
780102 Physical sciences
260300 Geochemistry
Abstract Complete rare earth element (except Eu) and Y concentrations from the estuarine mixing zone (salinity =0.2 to 33) of Elimbah Creek, Queensland, Australia, were measured by quadrupole ICP-MS without preconcentration. High sampling density in the low salinity regime along with high quality data allow accurate tracing of the development of the typical marine rare earth element anomalies as well as Y/Ho fractionation. Over the entire estuary, the rare earth elements are strongly removed relative to a freshwater endmember (60-80% removal). This large overall removal occurs despite a strong remineralisation peak (190% for La, 130% for Y relative to the freshwater endmember) in the mid-salinity zone. Removal and remineralisation are accompanied by fractionation of the original (freshwater) rare earth element pattern, resulting in light rare earth element depletion. Estuarine fractionation generates a large positive La anomaly and a superchondritic Y/Ho ratio. Conversely, we observe no evidence to support the generation of the negative Ce anomaly in the estuary. With the exception of Ce, the typical marine rare earth element features can thus be attributed to estuarine mixing processes. The persistence of these features in hydrogenous sediments for at least 3.71 Ga highlights the importance of estuarine processes for marine chemistry on geological timescales. (c) 2005 Elsevier B.V. All rights reserved.
Keyword Chemistry, Multidisciplinary
Estuarine Mixing
North Pacific
River Waters
Gadolinium Anomalies
Ce Oxidation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

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Created: Wed, 15 Aug 2007, 09:57:49 EST