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

Yang, Jongtae; Haley, Brian A.

doi:10.1002/2016gc006412

Cited by 11 publications

(18 citation statements)

References 72 publications

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“…One positive test for REE adsorption in the oceans may be seen in conservative Arctic Ocean REE profiles where particles are near absent (Yang and Haley, 2016). We do note, however, that a counter-argument can be made in that there does not appear to be an appreciable difference in the [Nd] profiles relating to marginal sites vs. distal sites, where particle loading may be very different (German and Elderfield, 1990;Grasse et al, 2012;Goswami et al, 2014;Haley et al, 2014;Abbott et al, 2015b;Stichel et al, 2015).…”

Section: Modern Ocean Rees and Nd Isotopesmentioning

confidence: 80%

The Impact of Benthic Processes on Rare Earth Element and Neodymium Isotope Distributions in the Oceans

Haley

Abbott

et al. 2017

Front. Mar. Sci.

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Neodymium (Nd) isotopes are considered a valuable tracer of modern and past ocean circulation. However, the promise of Nd isotope as a water mass tracer is hindered because there is not an entirely self-consistent model of the marine geochemical cycle of rare earth elements (REEs, of which Nd is one). That is, the prevailing mechanisms to describe the distributions of elemental and isotopic Nd are not completely reconciled. Here, we use published [Nd] and Nd isotope data to examine the prevailing model assumptions, and further compare these data to emergent alternative models that emphasize benthic processes in controlling the cycle of marine REEs and Nd isotopes. Our conclusion is that changing from a "top-down" driven model for REE cycling to one of a "bottom-up" benthic source model can provide consistent interpretations of these data for both elemental and isotopic Nd distributions. We discuss the implications such a benthic flux model carries for interpretation of Nd isotope data as a tracer for understanding modern and past changes in ocean circulation.

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Section: Modern Ocean Rees and Nd Isotopesmentioning

confidence: 80%

The Impact of Benthic Processes on Rare Earth Element and Neodymium Isotope Distributions in the Oceans

Haley

Abbott

et al. 2017

Front. Mar. Sci.

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“…Although LSF fMnO 2 does not have halocline enrichments, it is similar to SSF for making up a relatively high fraction (>4%) of SPM below 1,000 m (Figures 5f, 6f, and S3). We hypothesize that high fMnO 2 in the deep Canada Basin partly explains the drawdown of rare earth elements below 1,000 m when compared to its source from the Atlantic Ocean (Yang & Haley, 2016). The source of high MnO 2 in the central Arctic Basin is discussed in section 4.2.…”

Section: Resultsmentioning

confidence: 96%

Size‐Fractionated Compositions of Marine Suspended Particles in the Western Arctic Ocean: Lateral and Vertical Sources

Xiang

Lam

2020

JGR Oceans

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We present full water depth sections of size‐fractionated (1–51 μm; >51 μm) concentrations of suspended particulate matter and major particle phase composition (particulate organic matter [POM], including its carbon isotopic composition [POC‐δ13C] and C:N ratio, calcium carbonate [CaCO3], opal, lithogenic particles, and iron and manganese [oxyhydr]oxides) from the U.S. GEOTRACES Arctic Cruise (GN01) in the western Arctic in 2015. Whereas biogenic particles (POM and opal) dominate the upper 1,000 m, lithogenic particles are the most abundant particle type at depth. Minor phases such as manganese (Mn) oxides are higher in GN01 than in any other U.S. GEOTRACES cruises so far. Extremely depleted POC‐δ13C, as low as ~ −32‰, is ubiquitous at the surface of the western Arctic Ocean as a result of different growth rates of phytoplankton. Moderate penetration of depleted POC‐δ13C to depth indicates active sinking of large particles in the central basin. Lateral transport from the Chukchi shelf is also of significance in the western Arctic, as is evident from increases in biogenic silica to POC ratios and Mn oxide concentrations in the halocline, as well as lithogenic element contents in the deep waters. Our study supports previous suggestions of the near absence of CaCO3 in the Arctic Basin. This study presents the first data set of concentration and composition of suspended particles in the western Arctic Ocean and sheds new light on the vertical and lateral processes that govern particle distribution in this enclosed ocean basin.

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“…Rare earth element analyses for the North Pacific pore waters have been previously reported (Abbott et al, 2015b(Abbott et al, , 2016a. Tasman Sea pore waters were analyzed using a SeaFAST II inline with a Thermo X-series II Inductively Coupled Plasma-Mass Spectrometer at the Keck Collaboratory for Plasma Mass Spectrometry (as described by Yang and Haley, 2016;Abbott, 2019). To compare the REE patterns of pore waters to potential host phases, we considered all pore water samples collected from the six sites (three North Pacific and three Tasman Sea) and other published marine pore water values (Haley et al, 2004;Abbott et al, 2015b).…”

Section: Ree Analysesmentioning

confidence: 99%

Are Clay Minerals the Primary Control on the Oceanic Rare Earth Element Budget?

2019

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The rare earth elements (REEs) are an important tool for understanding biogeochemical cycling and sedimentary processes in the global ocean. However, ambiguities in the marine REE budgets, including questions around the dominant source of REEs to the ocean, hinder the application of this tool. A bottom-up model for REE release into the ocean has recently been proposed, driven by early diagenetic processes such as sediment dissolution, with potentially significant implications for the interpretation of marine REE and Nd isotope paleo-records. Here, our goal is to identify the phase or phases that interact with the pore waters to drive such a benthic flux. We use new pore water REE, microbeam imaging and mineralogical data in combination with published pore water REE data to evaluate potential sedimentary REE host phases. Mineralogical and direct imaging observations suggest that authigenic Fe or Mn oxyhydroxides, which are widely considered a dominant REE host phase, are not sufficiently abundant sediment components to account for the high Nd concentrations recovered in reductive leaches, and are unlikely to be the primary source of pore water REEs. Pore water REE signatures similar to river sourced clays indicate a detrital clay dissolution source, while the spread in heavy to light REE enrichment in pore waters and bottom waters relative to this clay source is best explained by fractionation during authigenic clay uptake of REEs. We therefore conclude that clay mineral dissolution and authigenesis are likely the primary influences on the REE cycling near the seafloor. We propose that the balance between dissolution and authigenesis controls the concentration, ratio of heavy and light REE abundances, and the isotopic composition of the pore waters. We discuss the implications of this hypothesis on an oceanic REE budget controlled by a benthic flux from a sedimentary REE source, and the use of authigenic neodymium isotopes as a paleoproxy for shifts in ocean circulation.

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

Cited by 11 publications

References 72 publications

The Impact of Benthic Processes on Rare Earth Element and Neodymium Isotope Distributions in the Oceans

The Impact of Benthic Processes on Rare Earth Element and Neodymium Isotope Distributions in the Oceans

Size‐Fractionated Compositions of Marine Suspended Particles in the Western Arctic Ocean: Lateral and Vertical Sources

Are Clay Minerals the Primary Control on the Oceanic Rare Earth Element Budget?

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