Selective uptake of rare earth elements in marine systems as an indicator of and control on aerobic bacterial methanotrophy

Meyer, Annaliese C. S.; Grundle, Damian S.; Cullen, Jay T.

doi:10.1016/j.epsl.2021.116756

Cited by 14 publications

(7 citation statements)

References 48 publications

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“…The potential for substantial, indirect influence from organic degradation on the original carbonate REY pattern was also proposed in a recent study by Zhang and Shields (2022). Some research shows that organic matter preferentially absorbs LREE and then releases it at depth during remineralisation (Chen et al 2015, Meyer et al 2021, but the understanding of REY in the biological system is still at an early stage; thus, a range of REY patterns in organic matter might be expected (Zhang and Shields 2022). In contrast to REY patterns, the low Sr content of organic matter means that it will have little influence on pore fluid Sr isotope composition.…”

Section: Argillaceous and Dolomitic Limestonesmentioning

confidence: 80%

“…2015, Meyer et al . 2021), but the understanding of REY in the biological system is still at an early stage; thus, a range of REY patterns in organic matter might be expected (Zhang and Shields 2022). In contrast to REY patterns, the low Sr content of organic matter means that it will have little influence on pore fluid Sr isotope composition.…”

Section: Discussionmentioning

confidence: 99%

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Effective Leaching of Argillaceous and Dolomitic Carbonate Rocks for Strontium Isotope Stratigraphy

Chen,

Zhou

2023

Geostandard Geoanalytic Res

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Various methods have been developed to extract a primary seawater Sr isotope signal from carbonate rocks for strontium isotope stratigraphy. However, there is little consensus around the best method due to variable sample purity and mineralogy. For this study, we applied sequential leaching to a range of rock samples in order to explore strontium isotope leaching systematics of less favoured argillaceous and dolomitic limestone samples. Following an ammonium acetate (NH4Ac) prewash that removed ~ 10% of the carbonate fraction, a subsequent dilute acetic acid leach (10–30% aliquot) was shown to extract the lowest, demonstrably least altered seawater 87Sr/86Sr isotope ratios, along with in most cases seawater‐like rare earth element (REE) plus yttrium (Y) patterns with the highest Y/Ho ratios (mostly > 36). Subsequent dissolution steps exhibited significantly elevated 87Sr/86Sr isotope ratios, Rb/Sr, Al/Ca and Mg/Ca ratios, indicating greater contributions from aluminosilicates and dolomite in the leachates. The new dissolution method by comparison significantly increases the likelihood of obtaining primary seawater 87Sr/86Sr isotope ratios from argillaceous and dolomitic limestones where the other established procedures failed. Broad application of this approach could improve the temporal resolution of the seawater Sr isotope curve, especially where high purity limestone samples are scarce.

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Section: Argillaceous and Dolomitic Limestonesmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Effective Leaching of Argillaceous and Dolomitic Carbonate Rocks for Strontium Isotope Stratigraphy

Chen,

Zhou

2023

Geostandard Geoanalytic Res

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“…The potential for substantial, indirect influence from organic degradation on the original carbonate REY pattern was also proposed in a recent study by Zhang and Shields, (2022). Some research shows that organic matter preferentially absorbs LREE and then releases it at depth during remineralization (Chen et al, 2015;Meyer et al, 2021), but the understanding of REY in the biological system is still at an early stage; thus, a range of REY patterns in organic matter might be expected (Zhang and Shields, 2022). In contrast to REY patterns, the low Sr content of organic matter means that it will have little influence on pore fluid Sr isotope composition.…”

Section: Organic Matter Activity and Dolomitizationmentioning

confidence: 81%

Effective leaching of argillaceous and dolomitic carbonate rocks for strontium isotope stratigraphy

CHEN¹,

Zhao²

2023

Preprint

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In recent years, various sample preparation methods have been developed to extract a primary Sr isotope signal from carbonate rocks. However, there has been little consensus around the best method due to natural variability in sample purity and mineralogy. For this study, we conducted systematic leaching experiments, focussing mainly on generally less favoured argillaceous and dolomitic limestones, using samples from the Mesoproterozoic Gaoyuzhuang Formation. Learning from previous studies, a multistep leaching approach was used to explore strontium isotope leaching systematics and extract near-primary isotopic ratios. For argillaceous and dolomitic limestone, the first 10%-30% dilute acetic acid leach, following an ammonium acetate (NH4Ac) prewash, yielded the lowest, demonstrably least altered seawater 87Sr/86Sr ratios. Subsequent dissolution steps exhibited significantly elevated 87Sr/86Sr, Rb/Sr, Al/Ca, and Mg/Ca ratios, indicating greater contributions from aluminosilicates and dolomite in the leachates. Lanthanide rare earth element and yttrium (REY) concentrations were also examined for each leaching step. In most cases, seawater-like REY patterns with the highest Y/Ho ratios (mostly > 36) occur in the first leaching step after ammonium acetate prewash, which is consistent with the Sr isotope study. However, one organic-rich sample (TOCtotal ~1.3%) with a near-seawater Sr isotope value exhibits a non-seawater-like REY pattern, possibly indicating that early diagenetic exchange during organic remineralization may influence the REY pattern of carbonate rocks without necessarily changing Sr isotopes. We applied previously proposed leaching cut-offs (preleach 30% ~ 40%, 60% ~ 70%), alongside the cut-off proposed from this study, for samples with various Mg/Ca and carbonate purities. We found that for the same argillaceous and dolomitic carbonate rocks, applying higher leaching cut-offs might cause sizeable error compared with targeting the first 10% ~ 30% directly after NH4Ac prewash. However, no significant differences were evident for high purity, and low Mg/Ca limestones, highlighting the importance of matching different sample types to the most appropriate dissolution method. Here we demonstrate that argillaceous, even partially dolomitized limestones could help fill gaps in the Precambrian seawater Sr isotope curve, especially where higher purity limestone successions are not readily available.

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“…The (re-)dissolution of elements caused by heterotrophic activity seems to superimpose any effect of adsorption on bacterial surfaces. Another possible reaction between bacteria and REEs could be the sequestration of LREEs by lanthanide-dependent bacteria (see above ;Daumann, 2019;Huang et al, 2019;Glass et al, 2020;Meyer et al, 2021), leading to LREE removal from seawater. Even though methane was not determined during the experiment, its production this incubation phase is unlikely since the developing phytoplankton are not known to produce methane (Klintzsch et al, 2019).…”

Section: Phase Ii-bacterioplankton Maximummentioning

confidence: 99%

“…They have a variety of methanol-dehydrogenase that use LREEs as cofactors. The elements are transported into the cells via lanthanophores, proteins that specialize in binding LREEs (Cotruvo, 2019;Daumann, 2019;Huang et al, 2019;Glass et al, 2020;Meyer et al, 2021). Thus, at this state of the spring bloom (stationary Phaeocystis), the utilization of LREEs as essential co-factors in enzymes of methanotrophic bacteria might be possible.…”

Section: Phase IV -Stationary Phaeocystis Sp Bloommentioning

confidence: 99%

Rare earth element behaviour in seawater under the influence of organic matter cycling during a phytoplankton spring bloom – A mesocosm study

et al. 2022

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Rare earth elements (REEs) are used as powerful proxies for a variety of oceanic processes. The understanding of their biogeochemical behaviour in the marine environment is therefore essential. While the influence of OM-cycling on REE patterns in seawater is considered as insignificant, it has been shown that algae and bacteria provide good sorption surfaces for REEs and that components of the dissolved OM pool are able to complex REEs, thus potentially altering their behaviour. To investigate the impact of bio-associated processes on REEs in the bio-productive marine environment, we conducted an indoor mesocosm experiment that mimicked a phytoplankton spring bloom in the neritic coastal North Sea. The incubation period of 38 days covered two distinct phytoplankton bloom phases (diatoms followed by Phaeocystis sp.) and an interjacent bacterioplankton maximum. All dissolved REEs (dREEs) except samarium showed similar temporal concentration patterns, which were closely connected to the bloom succession. The concentration patterns were shaped by the ‘phytoplankton-shuttle’, which summarizes adsorption processes on phytoplankton-derived particulate OM (POM) and resulted in decreasing dREE concentrations alongside chlorophyll-a and POM maxima. The ‘heterotrophic-shuttle’ resulted in increasing dREE concentrations likely linked to heterotrophically mediated regeneration of POM and associated desorption processes. The effect of these processes on dREEs resulted in enhanced fractionation of light REEs (LREEs) relative to heavy REEs (HREEs) during adsorption processes and decreased fractionation as a result of desorption. At times of high dissolved organic carbon (DOC) concentrations, we observed a stabilization of especially dHREEs likely in organic complexes. To test the potential influence of DOC on dREEs, we used a PHREEQC model approach that revealed dREE complexation with components of the DOC pool and an increase in complexation with atomic mass of the REEs. That is, at high DOC concentrations OM-dREE complexation leads to an effective and preferential buffering of dHREE against adsorption. Our findings reveal that OM-cycling influences concentration patterns of dREEs via ad- and desorption processes as well as organic complexation with parts of the OM pool, suggesting these processes can have a significant impact on dREE concentrations in the natural marine environment under high OM conditions.

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Selective uptake of rare earth elements in marine systems as an indicator of and control on aerobic bacterial methanotrophy

Cited by 14 publications

References 48 publications

Effective Leaching of Argillaceous and Dolomitic Carbonate Rocks for Strontium Isotope Stratigraphy

Effective Leaching of Argillaceous and Dolomitic Carbonate Rocks for Strontium Isotope Stratigraphy

Effective leaching of argillaceous and dolomitic carbonate rocks for strontium isotope stratigraphy

Rare earth element behaviour in seawater under the influence of organic matter cycling during a phytoplankton spring bloom – A mesocosm study

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