Rare earth element distribution in Caribbean seawater: Continental inputs versus lateral transport of distinct REE compositions in subsurface water masses

Osborne, Anne H; Haley, Brian A.; Hathorne, Ed C; Plancherel, Yves; Frank, Martin

doi:10.1016/j.marchem.2015.03.013

Cited by 89 publications

(78 citation statements)

References 67 publications

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“…The method of Hathorne et al (2012) was further improved by using 8 mL sample loop and by preparation of calibration standards with a mixed REE solution of a seawater-like composition in a natural seawater matrix (Osborne et al, 2015 …”

Section: Nd Isotopic Composition [Nd] Id and [Ree]mentioning

confidence: 99%

“…The dissolved REE concentrations and their relative distribution patterns provide complementary information on the composition of the source material, the amount of time since the last contact with weathering inputs, and adsorption and desorption processes (e.g. Garcia-Solsona et al, 2014;Haley et al, 2014;Hathorne et al, 2015;Molina-Kescher et al, 2014). This is possible because of systematic changes in the particle-reactivity of the REEs across the group caused by decreasing ionic radii and increasing covalent character with increasing atomic number.…”

Section: Introductionmentioning

confidence: 99%

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Ocean circulation and freshwater pathways in the Arctic Mediterranean based on a combined Nd isotope, REE and oxygen isotope section across Fram Strait

Laukert

Bauch

Hathorne

et al. 2017

Geochimica et Cosmochimica Acta

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Please cite this article as: Laukert, G., Frank, M., Bauch, D., Hathorne, E.C., Rabe, B., von Appen, W-J., Wegner, C., Zieringer, M., Kassens, H., Ocean circulation and freshwater pathways in the Arctic Mediterranean based on a combined Nd isotope, REE and oxygen isotope section across Fram Strait, Geochimica et Cosmochimica Acta (2016), doi: http://dx.doi.org/10. 1016/j.gca.2016.12.028 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Greenland freshwater of up to ~6 %. In addition to these observations, this study shows that the pronounced gradients in ε Nd signatures and REE characteristics in the upper water column provide a reliable basis for assessments of shallow hydrological changes within the AM.

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Section: Nd Isotopic Composition [Nd] Id and [Ree]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ocean circulation and freshwater pathways in the Arctic Mediterranean based on a combined Nd isotope, REE and oxygen isotope section across Fram Strait

Laukert

Bauch

Hathorne

et al. 2017

Geochimica et Cosmochimica Acta

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“…For the L-term we do not consider YREE complexes with fluoride, which are negligible, but add complexation with strong organic ligands, represented by the siderophore desferrioxamine B (DFOB), which may constitute as much as 30% of total dissolved YREE concentrations near the ocean surface (Christenson and Schijf, 2011 (Osborne et al, 2015) and the Pacific Ocean (Zhang and Nozaki, 1996), measured via ICP-MS.…”

Section: The Modified Equilibrium Model For Yree Scavenging In Seawatermentioning

confidence: 99%

“…The launch of the international GEOTRACES program circa 2010 has resulted in the unification and intercalibration of analytical protocols van de Flierdt et al, 2012), plus a revived interest in YREE marine geochemistry. A spate of new studies has appeared (e.g., Garcia-Solsona et al, 2014;Haley et al, 2014;Molina-Kescher et al, 2014;Osborne et al, 2014Osborne et al, , 2015Hathorne et al, 2015), but several unfortunately either do not report Y concentrations, or focus entirely on the upper or lower water column.…”

Section: Comparisons Of the Refined Bandk Model With Modern Shale-normamentioning

confidence: 99%

“…Because a detailed geographic investigation of YREE scavenging is beyond the scope of this work, we somewhat arbitrarily selected one shallow and one deep sample each from the Atlantic Ocean (Osborne et al, 2015) and the Pacific Ocean (Zhang and Nozaki, 1996). Their YREE patterns, normalized to Post-Archaean Australian Shale (PAAS) (McLennan, 1989), are shown in Figure 4.…”

Section: Comparisons Of the Refined Bandk Model With Modern Shale-normamentioning

confidence: 99%

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YREE scavenging in seawater: A new look at an old model

2015

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In the ocean, yttrium and the rare earth elements (YREEs) show nutrient-like vertical profiles. Since the YREEs have no manifest biological function, their removal from solution (scavenging) is probably caused by sorption on particles rather than active microbial uptake, yet the exact nature of these particles is uncertain. An existing theoretical model describes scavenging as an equilibrium between complexation with dissolved inorganic ligands and with functional groups on particle surfaces. This model was able to predict input-normalized (i.e., shale-normalized) YREE abundance patterns in seawater without requiring poorly known parameters like particle concentrations or the site densities of functional groups. Employing well-established stabilities of inorganic YREE complexes, while assuming that the sorbent particles are organic with functional groups represented by a mixture of simple monocarboxylic acids, it reproduced some key features of seawater YREE patterns, specifically the characteristic increase of shale-normalized abundance with atomic number and distinctive anomalies of certain trivalent REEs (La and Gd). The familiar negative Ce anomaly of seawater, however, is due to redox reactions that were not explicitly accounted for.In this study, we refined calculations of YREE solution speciation by adding complexation with desferrioxamine B to gauge the influence of strong organic ligands prevalent near the ocean surface. The scavenging model was then inverted by subtracting high-quality YREE abundance patterns, reported for the open ocean, from this solution speciation to yield an average pattern of relative YREE affinities for the sorbent particles. The resulting affinity pattern is compared with patterns of distribution coefficients, derived from laboratory experiments, for YREE sorption on relevant solid phases including hydrated Fe and Mn oxides (HFO/HMO), calcite, and the green macroalga Ulva lactuca as a substitute for marine organic matter. For deep seawater, the best agreement is observed with HMO, which may thus be the dominant carrier of YREEs to the sediment. Since Ce is catalytically oxidized on manganese oxide surfaces, this could have implications for the evolution of the Ce anomaly. Direct comparisons of distribution coefficient patterns with YREE analyses of suspended particles from the Atlantic Ocean also favor HMO, but this may be dictated in one case by the use of a selective leaching method. For shallow seawater, particularly in the Atlantic Ocean, the best agreement is observed with U. lactuca and calcite, although the latter is offset by the low YREE contents of this biogenic mineral. Matches with HFO are generally less convincing. The aforementioned mixture of simple monocarboxylic acids is not a good proxy for the sorptive properties of marine organic matter.

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The profile of the rare earth elements in the Canada Basin, Arctic Ocean

Yang

Haley

2016

Geochem Geophys Geosyst

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We analyzed the dissolved rare earth element (REE) content of three water column profiles (two shelf sites and one deep basin site) in the Canada Basin in order to better constrain the behavior of REEs in the Arctic Ocean. Dissolved concentrations of the REEs in the surface are 1.3–1.9 times higher than deep water (>500 m) concentrations, which are constant with depth (La: 19–23 pM, Nd: 14–17 pM, Yb: 4.0–4.3 pM). The dominant source of REEs to the surface waters of the Canada Basin is most likely Pacific water flowing through the Bering Strait and Chukchi Sea and/or the Mackenzie River. Dissolved REEs in the intermediate and deep waters are constant and appear to behave conservatively, allowing us to investigate this aspect of REE behavior in the oceans. Calculated deep ocean residence times of the REEs in the Canada Basin range from 450 to 700 years and match the age of these waters. We postulate that these values are likely applicable to global deep ocean reservoirs and that observed deviations from this conservative value can help to constrain nonconservative processes acting on the REEs.

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Rare earth element distribution in Caribbean seawater: Continental inputs versus lateral transport of distinct REE compositions in subsurface water masses

Cited by 89 publications

References 67 publications

Ocean circulation and freshwater pathways in the Arctic Mediterranean based on a combined Nd isotope, REE and oxygen isotope section across Fram Strait

Ocean circulation and freshwater pathways in the Arctic Mediterranean based on a combined Nd isotope, REE and oxygen isotope section across Fram Strait

YREE scavenging in seawater: A new look at an old model

The profile of the rare earth elements in the Canada Basin, Arctic Ocean

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