Diffusion pathways of Fe2+ and Fe3+ during the formation of ferrian chromite: a µXANES study

Gervilla, Fernando; Asta, María P.; Fanlo, Isabel; Grolimund, Daniel; Ferreira-Sanchez, Dario; Samson, Vallerie Ann; Hunziker, Daniela; Colás, Vanessa; Gonzáléz-Jiménez, José María; Kerestedjian, Thomas; Sergeeva, Ivanina

doi:10.1007/s00410-019-1605-3

Cited by 9 publications

(9 citation statements)

References 38 publications

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“…In the literature on the zoned chromites described above, there is no mention of textures consistent with porous-chromite oxidation (Gervilla et al, 2019;Hodel et al, 2020). The volcanic rocks sampled by the studies cited above were observed to be fresh with little to no evidence of alteration, which is not consistent with a weathering environment capable of significantly modifying chromite compositions in either hydrothermal (Hodel et al, 2020) or metamorphic (Gervilla et al, 2019) regimes. Instead, since the chromite FeO and Al 2 O 3 concentrations are observed to increase from core to rim (which is a geochemical signature of magmatic oxidation in our model, i.e.…”

Section: Assessing Chromite-melt Equilibrium Based On Model Equilibrium Trivalent Cation Proportionsmentioning

confidence: 96%

Petrogenetic implications of chromite-seeded boninite crystallization experiments: Providing a basis for chromite-melt diffusion chronometry in an oxybarometric context

Coulthard

Zellmer

Tomiya

et al. 2021

Geochimica et Cosmochimica Acta

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Section: Assessing Chromite-melt Equilibrium Based On Model Equilibrium Trivalent Cation Proportionsmentioning

confidence: 96%

Petrogenetic implications of chromite-seeded boninite crystallization experiments: Providing a basis for chromite-melt diffusion chronometry in an oxybarometric context

Coulthard

Zellmer

Tomiya

et al. 2021

Geochimica et Cosmochimica Acta

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“…Zones of various reflectances around chromite cores of all types mainly reflect compositional variation in the rims between ferritchromit and chrome magnetite resulting from prograde (Evans and Frost 1975;Burkhard 1993;Loferski 1986;Fleet, 1993;Barnes 2000;Mondal et al 2006;Mukherjee et al 2010Mukherjee et al , 2015 or retrograde metamorphism (Proenza et al 2004;Gervilla et al 2012Gervilla et al , 2019Colás et al 2014Colás et al , 2017Colás et al , 2019Colás et al , 2020. The ferritchromit formation is contemporaneous with modification of the primary mineral assemblages of komatiitic peridotites (olivine, orthopyroxene, clinopyroxene) from cumulate and spinifex zones to serpentine, tremolite, and chlorite.…”

Section: Modification Of Chromite To Ferritchromit and Chrome Magneti...mentioning

confidence: 99%

Fractionation of trace and platinum-group elements during metamorphism of komatiitic chromites from the early Archean Gorumahishani greenstone belt, Singhbhum Craton (eastern India)

Banerjee

Mondal

Reisberg

et al. 2022

Contrib Mineral Petrol

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It is well established that the major and minor element contents of chromites are subject to change during greenschist to amphibolite facies metamorphism. During upper amphibolite facies metamorphism, chromite can be completely converted to chrome magnetite.However, not all elements are affected to the same degree, the concentrations of +2 ions (e.g. Zn, Co, Mn) being particularly vulnerable to modification. The degree to which trace elements, particularly the platinum-group elements (PGE), are affected has not been closely examined. The compositions and textures of chromites from komatiites of the Gorumahishani greenstone belt of the Singhbhum Craton (India) have experienced a range of metamorphic conditions from greenschist to amphibolite facies, providing the opportunity to study the changes of trace and platinum-group element composition with metamorphic grade. Five types of altered chromites are identified from the komatiitic suite of rocks in the ~120 km long greenstone belt. The type-I chromites are non-porous and characterized by the least modified cores. These chromites are mostly present in the northern Maharajgunj-Tua Dungri section where rocks show metamorphism from greenschist to greenschist-amphibolite transition facies. The type-II and type-III chromites are porous and mostly found in the southern Kapili section of the greenstone belt where rocks show metamorphism up to the mid-amphibolite facies. Type-IV and type-V chromites are completely modified to ferritchromit and chrome magnetite, respectively and are present in the komatiitic rocks from the entire greenstone belt. The central cores of the type-I and type-II grains have relatively higher concentrations of mobile trace elements (e.g. Zn, Co, and Mn) with higher Mg# [Mg/(Mg+Fe 2+ )], lower Cr# [Cr/(Cr+Al)] and lower Fe 3+ /R 3+ (R 3+ = Fe 3+ +Cr 3+ +Al 3+ ) ratios than their respective rims. Significantly higher concentrations of the immobile trace elements (e.g. Ti and V) in the cores of the type-II grains relative to their chrome magnetite rims from the Kapili section, and to the type-I varieties from other sections might be due to the metamorphism of the komatiitic rocks under higher grade conditions (amphibolite facies). In situ LA-ICPMS analysis for PGE reveal a relatively higher concentration of Ru and Rh in the rims of the type-I chromites than in the cores which is due to the diffusion of these elements from the normal spinel structure of the cores towards the bivalent octahedral sites of the inverse spinel structure of the chrome magnetite rims during metamorphic processes. The lower concentrations of Os, Ir, Ru, and Rh in the cores of the type-II chromites from the Kapili section might be related to the metamorphism of the rocks under higher grade conditions that facilitated the diffusion of these elements to associated sulfide or platinum-group mineral or alloy phases. The calculated partition coefficients of Sc,

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“…However, as outlined from the bulk rock dataset, the extent of fluid-rock interaction seems to have been somehow limited. Additional fluid rock interaction in shear zones where, in addition, spinel alteration can be promoted by deformation (e.g., Kapsiotis, 2015;Satsukawa et al 2015;Qiu and Zhu, 2018;Gervilla et al, 2019) is required to reach ferritchromite stage and ultimately magnetite ores. This is rather consistent with our field observation showing serpentinite-hosted magnetite ores occurred in a locus of fault system (Fig.…”

Section: Cr-spinel Alteration Processes At the Nanoscalementioning

confidence: 99%

“…They propose that "ferritchromitization" is actually an oxidation process with Mg and Al being expelled from the spinel to release lattice strain (e.g. Gervilla et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal alteration of chromitite-dunite pairs from the Sabzevar ophiolite (NE Iran): Chemical and nano-textural evolution of Cr-spinel

Eslami

Malvoisin

Brunet

2023

Lithos

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Diffusion pathways of Fe2+ and Fe3+ during the formation of ferrian chromite: a µXANES study

Cited by 9 publications

References 38 publications

Petrogenetic implications of chromite-seeded boninite crystallization experiments: Providing a basis for chromite-melt diffusion chronometry in an oxybarometric context

Petrogenetic implications of chromite-seeded boninite crystallization experiments: Providing a basis for chromite-melt diffusion chronometry in an oxybarometric context

Fractionation of trace and platinum-group elements during metamorphism of komatiitic chromites from the early Archean Gorumahishani greenstone belt, Singhbhum Craton (eastern India)

Hydrothermal alteration of chromitite-dunite pairs from the Sabzevar ophiolite (NE Iran): Chemical and nano-textural evolution of Cr-spinel

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