Transfer of rare earth elements (REE) from manganese oxides to phosphates during early diagenesis in pelagic sediments inferred from REE patterns, X-ray absorption spectroscopy, and chemical leaching method

Takahashi, Yoshio; Hayasaka, Yasutaka; Morita, Koichi; Kashiwabara, Teruhiko; Nakada, Ryoichi; Marcus, Matthew A.; Kato, Kenji; Tanaka, Kohei; Shimizu, Hiroshi

doi:10.2343/geochemj.2.0393

Cited by 62 publications

(31 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other studies have also shown that mobilization of REEs from detrital sediments, including volcanic ash, during diagenesis is common, and that authigenic Fe-Mn oxyhydroxides and authigenic phosphates are sinks of pore water REEs (Palmer and Elderfield, 1985;Elderfield and Pagett, 1986;Elderfield and Sholkovitz, 1987;Toyoda and Tokonami, 1990;Rasmussen et al, 1998;Martin and Haley, 2000;Takebe, 2005;Caetano et al, 2009;Schacht et al, 2010;Soyol-Erdene and Huh, 2013;Takahashi et al, 2015;Chen et al, 2015). Here, we extend the study of Abbott et al, (2015b) and Abbott et al (2016) to the basin scale and propose a conceptual model that relates the εNd of authigenic phases to pore water, bottom water and detrital sediment (Fig.…”

Section: A Conceptual Model Relating the εNd Of Authigenic Phase To Bsupporting

confidence: 64%

Neodymium isotopes in authigenic phases, bottom waters and detrital sediments in the Gulf of Alaska and their implications for paleo-circulation reconstruction

Haley

Mix

2016

Geochimica et Cosmochimica Acta

100

View full text Add to dashboard Cite

The isotopic composition of neodymium (εNd) extracted from sedimentary Fe-Mn oxyhydroxide offers potential for reconstructing paleo-circulation, but its application depends on extraction methodology and the mechanisms that relate authigenic εNd to bottom water. Here we test methods to extract authigenic εNd from Gulf of Alaska (GOA) sediments and assess sources of leachate Nd, including potential contamination from trace dispersed volcanic ash. We show that one dominant phase is extracted via leaching of core-top sediments. Major and trace element geochemistry demonstrate that this phase is authigenic Fe-Mn oxyhydroxide. Contamination of leachate (authigenic) Nd from detrital sources is insignificant (<1%); our empirical results are consistent with established kinetic mineral dissolution rates and theory. Contamination of extracted εNd from leaching of volcanic ash is below analytical uncertainty. However, the εNd of core-top leachates in the GOA is consistently more radiogenic than bottom water. We infer that authigenic phases record pore water εNd, and the relationships of εNd among bottom water, pore water, authigenic phases and detrital sediments are primarily governed by the exposure time of bottom water to sea-floor sediments, rate of exchange across the sediment-water interface and the reactivity and composition of detrital sediments. We show that this conceptual model is applicable on the Pacific basin scale and provides a new framework to understand the role of authigenic phases in both modern and paleo-applications including the use of authigenic εNd as a paleocirculation tracer.

show abstract

Section: A Conceptual Model Relating the εNd Of Authigenic Phase To Bsupporting

confidence: 64%

Neodymium isotopes in authigenic phases, bottom waters and detrital sediments in the Gulf of Alaska and their implications for paleo-circulation reconstruction

Haley

Mix

2016

Geochimica et Cosmochimica Acta

100

View full text Add to dashboard Cite

show abstract

“…The Ce anomaly in six Ca-rich apatite grains averaged −0.58 with a standard deviation of 0.12.This strongly-negative anomaly suggests an authigenic origin for the apatite, rather than a diagenetic one (Takahashi et al, 2015). The Ce/Ca weight ratio in the apatite standard was 0.023, and on that basis, the Ce/Ca ratio in the nodule apatite was 0.017 with a standard deviation of 0.004.…”

Section: Cerium Spot Xanesmentioning

confidence: 91%

Forms and distribution of Ce in a ferromanganese nodule

2018

Self Cite

View full text Add to dashboard Cite

We studied the distribution and speciation of Ce in a previously-characterized ferromanganese nodule from the South Pacific Gyre using X-ray microspectroscopy.We find Ce in three types of environmentdiffusely in all parts of the nodule except the Fe-rich, Mn-poor "matrix", fluorapatite grains with a negative Ce anomaly suggestive of an authigenic origin, and localized spots whose composition is consistent with a pseudobinary mixture of sorbed Ce 4+ and a mix of sorbed Ce 3+ and CeO 2. In contrast with some other elements such as Ti, there is no clear correlation of the Ce concentration in the diffuse areas with either that of Mn, Fe or any linear combination of the two.We argue that the CeO 2 came from oxidation of Ce 3+ in the water column, while the Ce in the Mn-rich regions may have been initially deposited as Ce 4+ and then partially reduced.

show abstract

“…A particulate phase acting as a sink when in contact with seawater will provide the best record of changes in ocean conditions through time. However, a phase that continues to act as a sink during burial will have any original seawater signature diagenetically overprinted as has already been proposed for biogenic phosphates and foraminifera (Palmer and Elderfield, 1985;Toyoda and Tokonami, 1990;Takahashi et al, 2015;Trotter et al, 2016;Zhang et al, 2016;Skinner et al, 2019).…”

Section: Introductionmentioning

confidence: 96%

“…However, to date little robust, direct evidence of the role of these phases has been found. Potential host phases include Fe-Mn oxyhydroxides (e.g., Sholkovitz et al, 1994;Bayon et al, 2004;Haley et al, 2004;Ren et al, 2015;Takahashi et al, 2015), cerium oxides (e.g., Haley et al, 2004), phosphates (e.g., Kon et al, 2014;Takahashi et al, 2015;Zhang et al, 2016), biogenic silicates (e.g., Akagi et al, 2014), organic matter (e.g., Duncan and Shaw, 2003;Haley et al, 2004;Schacht et al, 2010;Kim et al, 2012;Freslon et al, 2014), volcanic ash (e.g., Vance et al, 2004;Elmore et al, 2011;Wilson et al, 2013), and clays (e.g., Cullers et al, 1975;Grandjean et al, 1987;Zhang et al, 2016). These sediment components may not contribute equally to REE cycling, and their contributions will vary in space and time as the amount of REEs remobilized from each phase is likely a function of mineralogy, mineral chemistry, reactivity, surface area, and other factors such as local pore water chemistry and redox state (e.g., Elderfield and Sholkovitz, 1987;Wilson et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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

2019

View full text Add to dashboard Cite

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.

show abstract

Transfer of rare earth elements (REE) from manganese oxides to phosphates during early diagenesis in pelagic sediments inferred from REE patterns, X-ray absorption spectroscopy, and chemical leaching method

Cited by 62 publications

References 71 publications

Neodymium isotopes in authigenic phases, bottom waters and detrital sediments in the Gulf of Alaska and their implications for paleo-circulation reconstruction

Neodymium isotopes in authigenic phases, bottom waters and detrital sediments in the Gulf of Alaska and their implications for paleo-circulation reconstruction

Forms and distribution of Ce in a ferromanganese nodule

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

Contact Info

Product

Resources

About