The behaviour of ferric iron during partial melting of peridotite

Sorbadère, Fanny; Laurenz, Vera; Frost, Daniel J.; Wenz, Michelle D.; Rosenthal, Anja; McCammon, Catherine; Rivard, Camille

doi:10.1016/j.gca.2018.07.019

Cited by 38 publications

(49 citation statements)

References 69 publications

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“…However, hampered by the size of the melt pools, the Mössbauer spectroscopy technique is excluded from this study. It's also a challenge to apply the XANES technique to hydrous glasses (Cottrell et al, ) or reduced samples with very low Fe 3+ content (Sorbadere et al, ). Another widely used approach is to calculate fO 2 by the mineral oxybarometers (olivine‐opx‐spinel).…”

Section: Resultsmentioning

confidence: 99%

“…Fe content of the noble metal in equilibrium with silicate melt is a function of the ambient fO 2 . Barr and Grove () calibrated the equilibrium constant for AuPdFe alloys coexisting with Fe‐bearing silicate melts and developed the AuPdFe alloy‐melt fO 2 sensor, which was shown to be accurate at least at fO 2 below FMQ (Sorbadere et al, ). Using both the AuPdFe sensor and semi‐empirical olivine‐opx‐spinel oxybarometer (Ballhaus et al, ), we calculated fO 2 values in eight of our experiments, in which olivine, opx, and spinel coexisted.…”

Section: Resultsmentioning

confidence: 99%

“…We have calculated experimental fO 2 s (Table ) using both the semi‐empirical equation (Ballhaus et al, ) and the AuPdFe sensor (Barr & Grove, ). As far as we know, the olivine‐opx‐spinel oxybarometer has small errors at oxidized conditions, but large errors at reduced conditions due to the large uncertainties associated with spinel Fe 3+ contents (Ballhaus et al, ), whereas the AuPdFe sensor is more precise at reduced conditions (Barr & Grove, ) but has large errors at oxidized conditions due to the very low Fe contents in alloy capsules (Sorbadere et al, ). Therefore, to ensure the most accurate fO 2 values were utilized, we adopt fO 2 values obtained from the olivine‐opx‐spinel oxybarometer at oxidized conditions (fO 2 > FMQ) and those obtained from the AuPdFe sensor at reduced conditions (fO 2 < FMQ).…”

Section: Resultsmentioning

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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

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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“…However, there is no clear relationship between Fe 3+ /Fetot and indices of melt fraction (e.g. Na8) for the global MORB dataset (Cottrell and Kelley, 2011) and recent experimental work has shown that the Fe 3+ /Fetot of peridotite partial melts remains approximately constant during partial melting (Sorbadere et al, 2018). Nevertheless, it is constructive to consider the maximum Fe-isotope composition that may be produced by low-fraction melting of a highly-oxidised source (~QFM+2), and whether or not these hypothetical melts may explain the composition of the GSC basalts.…”

Section: Melt Fraction and Fo2mentioning

confidence: 94%

Novel insights from Fe-isotopes into the lithological heterogeneity of Ocean Island Basalts and plume-influenced MORBs

Gleeson

Gibson

Williams

2020

Earth and Planetary Science Letters

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The extent of lithological heterogeneity in the Earth's convecting mantle is highly debated. Whilst the presence of pyroxenite in the mantle source regions of Ocean Island Basalts (OIBs) has traditionally been constrained using the minor-element chemistry of olivine phenocrysts, recent studies have shown that the Ni and Mn contents of primitive olivines are influenced by the conditions of mantle melting, as well as magma chamber processes. Nevertheless, constraining the lithological properties of the mantle is important due to it's influence on the P-T path followed by solid mantle material during adiabatic ascent, as well as the density of upwelling mantle plumes. We have therefore explored the use of Fe-isotopes as a novel method of tracing lithological heterogeneity in the mantle source regions beneath plume-influenced segments of the global Mid-Ocean Ridge system as well as OIBs. We present new Fe-isotope (δ 56 Fe) and trace-element data for 26 basaltic glasses from the plume-influenced Galápagos Spreading Centre to investigate the relative roles of pyroxenite and peridotite in the mantle source region of oceanic basalts. Our data reveals significant heterogeneity in the Fe-isotope composition of the Galápagos Spreading Centre basalts (+0.05-+0.25‰ δ 56 Fe), which correlates with key major-and trace-element parameters (e.g. CaO(8)/Al2O3(8), [La/Sm]n). Application of new models developed to calculate Fe-isotope fractionation during mantle melting, alongside Monte Carlo simulations for melting of a 2-component peridotite mantle, show that this This manuscript has been accepted for publication in Earth and Planetary Science Letters. Please cite this article as: Gleeson et al. (2020). Novel insights from Fe-isotopes into the lithological heterogeneity of Ocean Island Basalts and plume-influenced MORBS. Earth and Planetary Science Letters.

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“…Of course, this interesting technique is not reserved to cultural heritage materials, and several other examples of study can be found in the literature concerning different material types [22][23][24][25][26]. Full-field-based techniques are still in development and become more and more available on synchrotron beamlines such as, for instance on PUMA, a beamline at SOLEIL (French synchrotron, Saclay) dedicated to the study of cultural heritage materials.…”

Section: Resultsmentioning

confidence: 99%

Full-Field Transmission X-ray Microspectroscopy (FF-XANES) Applied to Cultural Heritage Materials: The Case of Ancient Ceramics

Sciau¹,

Wang²

2019

Synchrotron Radiation - Useful and Interesting Applications

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Synchrotrons provide more and more significant analytical techniques to investigate ancient materials from cultural heritages. New ways to visualize the complex structure of these materials are developed on the basis of elemental, density, and refraction contrasts. The tunability of synchrotron beams owing to the high flux and high spectral resolution of photon sources is at the origin of the main chemical speciation capabilities of synchrotron-based techniques. Among them the full-field X-ray absorption near-edge structure (XANES) imaging technique using hard X-rays is particularly efficient. It allows investigating a significant volume of material with a very good spatial resolution, which is invaluable for ancient material because of their heterogeneity and complexity. After presenting the technique and its variants, we will show its ability to study cultural heritage materials through a few examples.

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The behaviour of ferric iron during partial melting of peridotite

Cited by 38 publications

References 69 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

Novel insights from Fe-isotopes into the lithological heterogeneity of Ocean Island Basalts and plume-influenced MORBs

Full-Field Transmission X-ray Microspectroscopy (FF-XANES) Applied to Cultural Heritage Materials: The Case of Ancient Ceramics

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