Rare Earth Element Distribution in the NE Atlantic: Evidence for Benthic Sources, Longevity of the Seawater Signal, and Biogeochemical Cycling

Crocket, Kirsty C.; Hill, Emily Jane; Abell, Richard; Johnson, Clare; Gary, Stefan F.; Brand, Tim; Hathorne, Ed C

doi:10.3389/fmars.2018.00147

Cited by 56 publications

(22 citation statements)

References 95 publications

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“…The REE behavior generally observed in the open ocean reflects a "nutrient-like" shape, with increasing concentrations with depth (Elderfield, 1988, Jeandel et al, 2013, Abbot et al, 2015Schijf et al, 2015). However, our dissolved REE vertical profiles in the central MS do not show such a pattern, likely reflecting the circulation of relatively young water masses (e.g., WMDW estimated age ranges from 20 to 35 y; Rhein and Hinrichsen, 1993;Flecha et al, 2019) with limited time to accumulate remineralized loads of dissolved REE (Crocket et al, 2018). Reasonably discriminated vertical profiles are displayed for LREE with comparison to HREE.…”

Section: Dissolved Rare Earth Element Concentrations: Vertical Profilesmentioning

confidence: 51%

“…In order to examine the tentative conservative behavior of HREE (Zheng et al, 2016;Crocket et al, 2018) and ε Nd (Goldstein and Hemming, 2003;Lambelet et al, 2016) as water mass tracers in the MS, we used the multi-parameter water mass analysis (OMPA method) described above to estimate the contributions of the four water masses recognized in the central MS. The properties of locally chosen water types (end-members) within the studied region are given in Table 2 and the resulting OMPA weights were of 15.8, 11.2, 5.7, 11.2 and 2.0 for potential temperature, salinity, dissolved oxygen, ε Nd and HREEn equations.…”

Section: Tracing Water Masses: Multi-parameter Mixing Modelmentioning

confidence: 99%

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Rare Earth Elements and Nd isotopes as tracers of modern ocean circulation in the central Mediterranean Sea

García-Solsona¹,

Pena²,

Paredes³

et al. 2020

Preprint

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Seawater Rare Earth Element (REE) concentrations and Nd isotopic composition (&#949;Nd) are increasingly applied as valuable tracers of oceanographic processes such as water mass mixing and lithogenic inputs to seawater. However, their measurements are basically lacking in the Mediterranean Sea water column. This study analyzes 9 seawater stations around the central Mediterranean Sea to clarify the relative importance of external sources, vertical (biogeochemical) processes and lateral water mass transport in controlling REE and &#949;Nd distributions. Concentrations of REE do not show nutrient-like profiles with depth, likely indicative of relatively young waters with limited accumulation of remineralized REE. Light REE (LREE) present a non-conservative behavior, which largely peak at surface waters and rapidly decrease with depth. The negative correlation of surface LREE enrichment with offshore distance highlights the influence of continental input from the western Italian coast to the Tyrrhenian surface waters. In contrast to other regions with reported boundary exchange, this process does not modify the &#949;Nd values here. On the other side, distributions of dissolved heavy REE (HREE) and &#949;Nd display a conservative behavior that can be explained by mixing of western- (MAW and WMDW) and eastern- (LIW and EMDW) originated waters. We test this hypothesis with an Optimum Multi-Parameter Analysis (OMPA) including HREE and &#949;Nd parameters. Even though the limited data set, consistent results of water mass fractions are obtained for the four main water masses although with some particularities. While LIW take on major importance when considering HREE in the model, EMDW fractions are preferentially detected with &#949;Nd. This latter finding implies a noticeable deep water flux across the Sicily Strait into the Western Mediterranean that was not clearly evidenced before.

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Section: Dissolved Rare Earth Element Concentrations: Vertical Profilesmentioning

confidence: 51%

Section: Tracing Water Masses: Multi-parameter Mixing Modelmentioning

confidence: 99%

Rare Earth Elements and Nd isotopes as tracers of modern ocean circulation in the central Mediterranean Sea

García-Solsona¹,

Pena²,

Paredes³

et al. 2020

Preprint

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“…Apart from this, admixtures of REE may be related to weathered basaltic material from the Hawaiian area seafloor [99]. The elevated REE concentrations can also be attributed to desorption from resuspended sediments and pore water released into the overlying water column [100].…”

Section: Discussionmentioning

confidence: 99%

Fractionation Trends and Variability of Rare Earth Elements and Selected Critical Metals in Pelagic Sediment from Abyssal Basin of NE Pacific (Clarion-Clipperton Fracture Zone)

et al. 2020

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The geochemical and mineralogical characteristics of pelagic sediments collected from the Interoceanmetal Joint Organization (IOM) claim area, located in the eastern part of the Clarion-Clipperton Fracture Zone (CCFZ; eastern tropical Pacific), are described in this paper. The concentrations of rare earth elements (REE), as well as other selected critical elements contained in 135 sediment samples of siliceous clayey silts, are presented. The vertical and spatial variabilities of elements, with particular emphasis on REE as well as metals of the highest economic interest such as Cu, Ni, and Co, are detailed. The applied methods include grain size analysis by laser diffraction, geochemistry examination using ICP-MS, XRF, AAS, and CNS spectrometry, and XRD analysis of mineral composition (Rietveld method). Additionally, statistical methods such as factor analysis (FA) and principal components analysis (PCA) were applied to the results. Finally, a series of maps was prepared by geostatistical methods (universal kriging). Grain size analysis showed poor sorting of the examined fine-grained silts. ICP-MS indicated that total REE contents varied from 200 to 577 ppm, with a mean of 285 ppm, which is generally low. The contents of critical metals such as Cu, Ni, and Co were also low to moderate, apart from some individual sampling stations where total contents were 0.15% or more. Metal composition in sediments was dominated by Cu, Ni, and Zn. A mineral composition analysis revealed the dominance of amorphous biogenic opaline silica (27–58%), which were mostly remnants of diatoms, radiolarians, and sponges associated with clay minerals (23% to 48%), mostly Fe-smectite and illite, with mixed-layered illite/smectite. The high abundance of diagenetic barite crystals found in SEM−EDX observations explains the high content of Ba (up to 2.4%). The sediments showed complex lateral and horizontal fractionation trends for REE and critical metals, caused mostly by clay components, early diagenetic processes, admixtures of allogenic detrital minerals, or scavenging by micronodules.

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“…Seawater profiles of the Atlantic Ocean (van der Flierdt et al, 2012) and the Mediterranean Sea (Censi et al, 2004) are indicated for comparison. Values are normalized to Post-Archean Australian Shale (PAAS) according to McLennan (1989). or resuspended sediment (Haley et al, 2004;Crocket et al, 2018), and therefore the relative abundances may fluctuate without precise temporal cyclicity.…”

Section: Discussionmentioning

confidence: 99%

“…Rare earth elements (REEs) are a group of 15 elements (La to Lu) with a similar electronic configuration of atoms, similar properties, and similar chemical behaviour (Elderfield, 1988), with the exceptions of Ce and Eu, which present multiple oxidation states. The main sources of REEs in seawater are atmospheric fallout (Elderfield and Greaves, 1982;De Baar et al, 1983) and riverine input through continental weathering (Goldstein et al, 1984;Frost et al, 1986), as well as hydrothermal activity (Olivarez and Owen, 1991). In addition to these various sources, the concentrations of REEs in seawater are impacted by adsorption processes of REEs to mineral surfaces and complexation with organic ligands, especially near the ocean surface (Sholkovitz et al, 1994;Schijf et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Rare earth elements in oyster shells: provenance discrimination and potential vital effects

et al. 2020

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Abstract. Rare earth elements (REEs) and yttrium in seawater originate from atmospheric fallout, continental weathering, and transport from rivers, as well as hydrothermal activity. Previous studies have reported the use of REE and Y measurements in biogenic carbonates as a means to reconstruct these surface processes in ancient times. As coastal seawater REE and Y concentrations partially reflect those of nearby rivers, it may be possible to obtain a regional fingerprint of these concentrations from bivalve shells for seafood traceability and environmental monitoring studies. Here, we present a dataset of 297 measurements of REE and Y abundances by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) from two species (Crassostrea gigas and Ostrea edulis). We measured a total of 49 oyster specimens from six locations in France (Atlantic Ocean and Mediterranean Sea). Our study reports that there is no significant difference in concentrations from shell parts corresponding to winter and summer periods for both species. Moreover, interspecific vital effects are reported from specimens from both species and from the same locality. REE and Y profiles as well as t-distributed stochastic neighbour embedding processing (t-SNE; a discriminant statistical method) indicate that REE and Y measurements from C. gigas shells can be discriminated from one locality to another, but this is not the case for O. edulis, which presents very similar concentrations in all studied localities. Therefore, provenance studies using bivalve shells based on REEs and Y have to first be tested for the species. Other methods have to be investigated to be able to find the provenance of some species, such as O. edulis.

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Rare Earth Element Distribution in the NE Atlantic: Evidence for Benthic Sources, Longevity of the Seawater Signal, and Biogeochemical Cycling

Cited by 56 publications

References 95 publications

Rare Earth Elements and Nd isotopes as tracers of modern ocean circulation in the central Mediterranean Sea

Rare Earth Elements and Nd isotopes as tracers of modern ocean circulation in the central Mediterranean Sea

Fractionation Trends and Variability of Rare Earth Elements and Selected Critical Metals in Pelagic Sediment from Abyssal Basin of NE Pacific (Clarion-Clipperton Fracture Zone)

Rare earth elements in oyster shells: provenance discrimination and potential vital effects

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