Determination of Fe3+/ΣFe of XANES basaltic glass standards by Mössbauer spectroscopy and its application to the oxidation state of iron in MORB

Zhang, Hongluo; Cottrell, Elizabeth; Sølheid, P.; Kelley, K. A.; Hirschmann, M. M.

doi:10.1016/j.chemgeo.2018.01.006

Cited by 127 publications

(151 citation statements)

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“…Details of the fO 2 estimation routines are given in Tables S9–S10. As shown in Figure , the fO 2 s for MORBs and their mantle sources range from FMQ‐1.7 to FMQ + 0.5 with a median at FMQ‐0.03, which are in excellent agreement with the previous results of Ballhaus (), Lee et al (), and Zhang et al (). The calculated fO 2 s for arc basalts depend on the bulk D V , which is in turn dependent on the calculated temperatures at the given H 2 O content.…”

Section: Discussionsupporting

confidence: 90%

“…During the corrections, olivine was added at a step of 0.1% until the melt is in equilibrium with Fo 90 . For the corrections of MORBs, the initial Fe 3+ /Fe T was set at 0.138 (Zhang et al, ). For arc basalts, the initial Fe 3+ /Fe T was set at 0.20, which is in the Fe 3+ /Fe T range of primitive arc basalts (0.18 to 0.22 in Kelley & Cottrell, ).…”

Section: Discussionmentioning

confidence: 99%

“…The fO 2 ranges and medians for oceanic and arc mantles reported by previous studies are also shown and V/Sc, Fe 3+ /Fe T , and Ol‐Opx‐Sp represent the different fO 2 estimation methods used in the previous studies. Abbreviations: B93 (Ballhaus, ); B14 (Brounce et al, ); C91 (Carmichael, ); Lee05 (Lee et al, ); P99 (Parkinson & Arculus, ); and ZH18 (Zhang et al, ). FMQ = fayalite‐magnetite‐quartz.…”

Section: Discussionmentioning

confidence: 99%

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Oxidation State of Arc Mantle Revealed by Partitioning of V, Sc, and Ti Between Mantle Minerals and Basaltic Melts

et al. 2019

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Whether arc mantle is more oxidized than oceanic mantle is persistently debated. The behavior of multivalent vanadium (V) is oxygen fugacity (fO 2 ) sensitive, and the ratios of V to a homovalent element (e.g., Sc, Ti, or Yb) in basalts were commonly used as fO 2 proxies. Similar ratios, such as V/Sc, between arc basalts and mid-ocean ridge basalts were previously taken as evidence for similar fO 2 s in their mantle sources. However, this claim may be problematic because elemental ratios are primarily controlled by partition coefficients (D values), which are further affected by various factors. Here we determined D values of V and other transition elements between mantle minerals and basaltic melts at typical arc T-P-H 2 O conditions and variable fO 2 s. Combining experimental results with published data, the effects of fO 2 , T, P, and phase compositions on D V , D Sc , and D Ti for olivine, orthopyroxene (opx), clinopyroxene (cpx), and spinel were evaluated using multiple linear regressions. The results show that D V values for these four minerals all increase with decreasing fO 2 and temperature, leading to higher D V /D Sc and D V /D Ti ratios at low temperatures than those at high temperatures given a certain fO 2 . Thus, similar V/Sc and V/Ti ratios between arc basalts and mid-ocean ridge basalts reflect a relatively oxidized arc mantle due to its lower melting temperatures. In light of the highly incompatible behavior of Ti during mantle melting, V-Ti systematics are regarded to be more superior than V-Sc systematics in the fO 2 estimation. Partial melting modelling results using V-Ti systematics reveal that arc mantle is, on average,~0.9 log units higher in fO 2 than oceanic mantle.Plain Language Summary The oxidation state of the Earth`s mantle, often expressed as oxygen fugacity (fO 2 ), could control the behavior of multivalent elements and thus exert a significant influence on the formation of magmatic ore deposits and the secular evolution of Earth`s atmosphere. Whether arc mantle is more oxidized than oceanic mantle remains a controversial topic. As a multivalent element, partitioning behavior of vanadium is fO 2 sensitive and is capable of tracking mantle redox state. However, except fO 2 , other factors (temperature, pressure, and phase composition) that may affect vanadium partitioning behavior have not been clearly evaluated. Here we conducted high temperature and pressure experiments to determine partition coefficients of vanadium during mantle melting under various fO 2 conditions. Combining our and published data, we evaluated the effects of fO 2 , T, P, and compositions of mineral and melt on the vanadium partitioning using multiple linear regressions. The results indicate that, in addition to fO 2 , temperature exerts a significant control on the vanadium partitioning. Additionally, we estimated fO 2 of the arc mantle via numerical modelling using appropriate partition coefficients for vanadium. Our results clarify and reconcile the discrepancies between previous studies and reveal that a...

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Oxidation State of Arc Mantle Revealed by Partitioning of V, Sc, and Ti Between Mantle Minerals and Basaltic Melts

et al. 2019

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“…The value of f(Fe 3+ )/f(Fe 2+ ) is dependent on the host matrix and, for some oxide minerals and glasses, can deviate from the value of 1.0. When this occurs in oxide glasses it usually results in a slight overestimation of the Fe 3+ content, based on fitted Fe 3+ and Fe 2+ areas (Zhang et al, 2018). The recoil-free fractions of Fe 2+ and Fe 3+ in the glass studied here are unknown, but evidence for multiple oxide minerals and glasses, summarized recently by Zhang et al (2018), suggests a slight overestimation of the Fe 3+ content.…”

Section: Figurementioning

confidence: 56%

“…When this occurs in oxide glasses it usually results in a slight overestimation of the Fe 3+ content, based on fitted Fe 3+ and Fe 2+ areas (Zhang et al, 2018). The recoil-free fractions of Fe 2+ and Fe 3+ in the glass studied here are unknown, but evidence for multiple oxide minerals and glasses, summarized recently by Zhang et al (2018), suggests a slight overestimation of the Fe 3+ content. However, redox quantification is further complicated by the presence of asymmetry in the Fe 2+ doublet.…”

Section: Figurementioning

confidence: 56%

Structure and properties of Na₅FeSi₄O₁₂ crystallized from 5Na₂O–Fe₂O₃–8SiO₂ glass

Ahmadzadeh

Olds

Scrimshire

et al. 2018

Acta Crystallogr C Struct Chem

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The phase Na5FeSi4O12 [pentasodium iron(III) silicate] crystallizes readily from the Na2O–Fe2O3–SiO2 glass system in a relatively large compositional range. However, its crystal structure and properties have not been studied in detail since its discovery in 1930. In this work, the Na5FeSi4O12 phase was crystallized from a host glass with 5Na2O·Fe2O3·8SiO2 stoichiometry, and both the glass and the crystal were studied. It was found that the Na5FeSi4O12 phase crystallizes at ∼720 °C from the glass and melts at ∼830 °C when heated at a rate of 10 °C min−1. The crystal structure was solved using single-crystal X-ray diffraction and the refined data are reported for the first time for the Na5FeSi4O12 phase. It exhibits trigonal symmetry, space group R\overline{3}c, with a = 21.418 and c = 12.2911 Å. The Na atoms located between adjacent structural channels exhibit positional disorder and splitting which was only refined by using low-temperature data collection (150 K). While ∼7% of the total Fe cations occur as Fe2+ in the glass, four-coordinated Fe3+ constitutes ∼93% of the total Fe cations. However, iron in the crystal, which exhibits a paramagnetic behavior, is solely present as six-coordinated Fe3+. The magnetic and vibrational properties of the glass and crystal are discussed to provide additional insight into the structure.

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Iron in Silicate Glasses and Melts

Losq

Cicconi

Neuville

2021

Geophysical Monograph Series

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Determination of Fe3+/ΣFe of XANES basaltic glass standards by Mössbauer spectroscopy and its application to the oxidation state of iron in MORB

Cited by 127 publications

References 68 publications

Oxidation State of Arc Mantle Revealed by Partitioning of V, Sc, and Ti Between Mantle Minerals and Basaltic Melts

Oxidation State of Arc Mantle Revealed by Partitioning of V, Sc, and Ti Between Mantle Minerals and Basaltic Melts

Structure and properties of Na₅FeSi₄O₁₂ crystallized from 5Na₂O–Fe₂O₃–8SiO₂ glass

Iron in Silicate Glasses and Melts

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Determination of Fe3+/ΣFe of XANES basaltic glass standards by Mössbauer spectroscopy and its application to the oxidation state of iron in MORB

Cited by 127 publications

References 68 publications

Oxidation State of Arc Mantle Revealed by Partitioning of V, Sc, and Ti Between Mantle Minerals and Basaltic Melts

Oxidation State of Arc Mantle Revealed by Partitioning of V, Sc, and Ti Between Mantle Minerals and Basaltic Melts

Structure and properties of Na5FeSi4O12 crystallized from 5Na2O–Fe2O3–8SiO2 glass

Iron in Silicate Glasses and Melts

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Structure and properties of Na₅FeSi₄O₁₂ crystallized from 5Na₂O–Fe₂O₃–8SiO₂ glass