Origin of carbonatites and associated silicate rocks revealed by Mg triple-isotope approach

Amsellem, Elsa; Schiller, Martin; Klausen, Martin B.; Bouyon, Amaury; Rojas, Virginia; Bizzarro, Martin

doi:10.1016/j.chemgeo.2023.121663

Cited by 5 publications

(2 citation statements)

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“…Comparison between previously reported Ca isotopic data and values measured in this study. Previously reported values are from the literature. ,,− ,,− Gray, red, and blue spots represent data from the literature, this study, and average values of literature values. All the compiled data are listed in Table S9.…”

Section: Resultsmentioning

confidence: 97%

High-Precision Measurements of ⁴⁴Ca/⁴⁰Ca Using Multiple-Collector Inductively Coupled Plasma Mass Spectrometry without Collision-Cell Technology

Gu,

Liu,

Sun

et al. 2024

Anal. Chem.

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Herein, we present a new method for determining the Ca isotopic composition of geological samples. To eliminate matrix elements from Ca, a column chromatography method was developed using a N,N,N′N′ tetraoctyl-1,5-diglycolamide (TODGA) resin. The Ca isotopic compositions were measured by a multiple collector inductively coupled plasma mass spectrometry (MC-ICP-MS) without collision cell equipment, especially that direct measurement to 44 Ca/ 40 Ca can be achieved. To mitigate the interference from 40 Ar during 40 Ca measurement, the cold plasma technique was used to suppress the Ar + generation, resulting in a background Ar + intensity of <300 mV, in contrast to the conventional hot plasma conditions, which typically yield thousands of volts for Ar + intensities. Given the potential for a concentration mismatch between the sample and bracketed standard solutions to cause an intensive shift in measured Ca isotopic compositions, a correction for the [Ca] match is needed. To avoid matrix effects arising from residue matrix elements, it is crucial to limit the concentrations below 1% of Ca for most matrix elements (including Al, Mg, K, Na, and Sr) and below 1‰ for Fe. Notably, the tolerance of residue Sr is effectively improved compared to measurements with CC-MC-ICP-MS and traditional Hot-plasma-SSB-MC-ICP-MS methods with the conventional hot plasma technique, thereby lowering the complexity of column chemistry. The measured δ 44/40 Ca, δ 44/42 Ca, and ε 40 Ca values for eight reference materials agree well with previously reported values within analytical uncertainties. This method demonstrates long-term precision is better than 0.10‰ (two standard deviations) for both δ values (i.e., δ 44/40 Ca and δ 44/42 Ca). We anticipate that the proposed method will benefit the growth of the Ca isotope data set and foster an increase in the application of Ca isotope in Earth science studies.

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Section: Resultsmentioning

confidence: 97%

High-Precision Measurements of ⁴⁴Ca/⁴⁰Ca Using Multiple-Collector Inductively Coupled Plasma Mass Spectrometry without Collision-Cell Technology

Gu,

Liu,

Sun

et al. 2024

Anal. Chem.

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“…There is compelling evidence that metasomatism driven by carbonated sediment melting occurs (C. Chen et al, 2016Chen et al, , 2017Hoernle et al, 2002), but the question of whether this is required for economic REE mineralization remains open. Claims of "metasomatism" or "refertilization" do not always contribute to the answer, as different elements will have different mobilities in mantle conditions, such that metasomatism may contribute elements other than the REE (e.g., Amsellem et al, 2023;Bolhar et al, 2020) Chandler et al, 2024;Nelson et al, 1988), in addition to the finding that carbonatites, in general, do not require recycled sediments (Sun et al, 2021). & Schmidt, 2008).…”

Section: What Is the Ree Source?mentioning

confidence: 99%

A Global Marine Sediment Compilation and a Cerium Anomaly Perspective on Metasomatized Mantle Sources for REE‐Mineralized Carbonatites

Anenburg,

Liu

2024

JGR Solid Earth

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Rare earth elements (REE) are vital for powerful permanent magnets used in electric motors and wind turbines. These elements are chiefly sourced from carbonatites and their weathering products. The economic attractiveness of carbonatites is explained by the 10,000‐fold enrichment of REE in their mineralized portions relative to the average continental crust. Carbonatites form from mantle‐derived melts, but the ultimate origin of their REE is not completely clear. One widely cited model invokes subduction of marine sediments which accumulate REE‐rich material, priming the mantle to produce REE‐rich carbonatite melts which subsequently form deposits in the upper crust. Here we examine a global marine sediment compilation, revealing a wide variety in REE abundances and patterns. We use the sensitive lambda method that separates REE pattern curvature from redox‐related element anomalies to examine both marine sediments and presumably derived carbonatite rocks. We find that the most REE‐rich marine sediments are characterized by strongly negative Ce anomalies, which if recycled via subduction, mineralized carbonatites are expected to inherit. In contrast, we find that mineralized carbonatite rocks do not contain Ce anomalies. This indicates that the REE from the most REE‐rich marine sediments are not recycled into carbonatite deposits, and a different REE source is needed to explain carbonatite fertilities. We also find evidence that raises questions on whether any sediment‐derived REE are present in carbonatite deposits to a significant amount. We suggest that a REE‐rich source may not be required and REE enrichment occurs primarily during crustal magmatic differentiation.

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Petrological, geochemical and mineralogical characteristics of Wigu Hill carbonatite, Uluguru Mountains, Tanzania: insights into carbonatite evolution and REE mineralization

Moshi,

Watanabe,

Boniface

et al. 2024

Miner Deposita

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Origin of carbonatites and associated silicate rocks revealed by Mg triple-isotope approach

Cited by 5 publications

References 100 publications

High-Precision Measurements of ⁴⁴Ca/⁴⁰Ca Using Multiple-Collector Inductively Coupled Plasma Mass Spectrometry without Collision-Cell Technology

High-Precision Measurements of ⁴⁴Ca/⁴⁰Ca Using Multiple-Collector Inductively Coupled Plasma Mass Spectrometry without Collision-Cell Technology

A Global Marine Sediment Compilation and a Cerium Anomaly Perspective on Metasomatized Mantle Sources for REE‐Mineralized Carbonatites

Petrological, geochemical and mineralogical characteristics of Wigu Hill carbonatite, Uluguru Mountains, Tanzania: insights into carbonatite evolution and REE mineralization

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Origin of carbonatites and associated silicate rocks revealed by Mg triple-isotope approach

Cited by 5 publications

References 100 publications

High-Precision Measurements of 44Ca/40Ca Using Multiple-Collector Inductively Coupled Plasma Mass Spectrometry without Collision-Cell Technology

High-Precision Measurements of 44Ca/40Ca Using Multiple-Collector Inductively Coupled Plasma Mass Spectrometry without Collision-Cell Technology

A Global Marine Sediment Compilation and a Cerium Anomaly Perspective on Metasomatized Mantle Sources for REE‐Mineralized Carbonatites

Petrological, geochemical and mineralogical characteristics of Wigu Hill carbonatite, Uluguru Mountains, Tanzania: insights into carbonatite evolution and REE mineralization

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Product

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High-Precision Measurements of ⁴⁴Ca/⁴⁰Ca Using Multiple-Collector Inductively Coupled Plasma Mass Spectrometry without Collision-Cell Technology

High-Precision Measurements of ⁴⁴Ca/⁴⁰Ca Using Multiple-Collector Inductively Coupled Plasma Mass Spectrometry without Collision-Cell Technology