First experimental determination of iron isotope fractionation between hematite and aqueous solution at hydrothermal conditions

Saunier, Gaëlle; Pokrovski, Gleb S.; Poitrasson, Franck

doi:10.1016/j.gca.2011.08.028

Cited by 48 publications

(26 citation statements)

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“…Equilibrium Fe isotope fractionations for mineral-mineral and mineral-fluid systems have been determined by 3 different approaches: (i) calculations of β-factors based on density functional theory (DFT) (Schauble et al 2001;Anbar et al 2005;Blanchard et al 2009;Rustad and Dixon 2009;Rustad et al 2010) and (ii) calculations based on Mössbauer spectroscopy and inelastic nuclear resonant X-ray scattering measurements (Polyakov 2007;Polyakov and Soultanov 2011;Dauphas et al 2012) and (iii) isotope exchange experiments (Skulan et al 2002;Welch et al 2003;Shahar et al 2008;Beard et al 2010;Saunier et al 2011;Wu et al 2011;Frierdich et al 2014).…”

Section: Isotope Equilibrium Studiesmentioning

confidence: 99%

Isotope Fractionation Processes of Selected Elements

Hoefs

2015

Stable Isotope Geochemistry

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Section: Isotope Equilibrium Studiesmentioning

confidence: 99%

Isotope Fractionation Processes of Selected Elements

Hoefs

2015

Stable Isotope Geochemistry

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“…Much attention has been paid to the isotopic fractionation among the major species controlling the speciation of the transition metals (i. e. Fe, Ni, Cu, Zn, Cr) in natural fluids, including seawater, and its application in geochemistry and biogeochemistry (Schauble et al, 2001;Anbar et al, 2005;Fujii et al, 2006Fujii et al, , 2011Fujii et al, , 2013Fujii et al, , 2014Domagal-Goldman and Kubicki, 2008;Hill and Schauble, 2008;Zuccolini, 2005, 2009;Black et al, 2011;Saunier et al, 2011). In contrast, much less attention has been devoted to the isotopic fractionation among the inorganic and organic species that control the aqueous speciation of the alkaline Earth metals, including magnesium (the notable exception is the observation by Li et al (2014) of a preferential partitioning of light Mg isotopes into aqueous Mg-EDTA complexes relative to Mg aquo ions).…”

Section: Introductionmentioning

confidence: 99%

The control of carbonate mineral Mg isotope composition by aqueous speciation: Theoretical and experimental modeling

et al. 2016

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“…Saunier et al 2011) (Polyakov and Mineev 2000). However, Fe isotopes may also fractionate significantly in aqueous solutions if changes occur in the non-redox environment, i.e.…”

Section: Introductionmentioning

confidence: 99%

Iron isotope fractionation in subduction-related high-pressure metabasites (Ile de Groix, France)

Korh

Luais

Deloule

et al. 2017

Contrib Mineral Petrol

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1during metamorphism: newly-formed Fe-rich minerals allowed preserving bulk rock Fe compositions during metamorphic reactions and hampered any Fe isotope fractionation. Greenschists have δ 56 Fe values (+0.17 ± 0.01 to +0.27 ± 0.02‰) similar to high-pressure rocks. Hence, metasomatism related to fluids derived from the subducted hydrothermally altered metabasites might only have a limited effect on mantle Fe isotope composition under subsolidus conditions, owing to the large stability of Fe-rich minerals and low mobility of Fe. Subsequent melting of the heavy-Fe metabasites at deeper levels is expected to generate mantle Fe isotope heterogeneities.Keywords Fe isotopes · Metabasites · Subduction · HP-LT metamorphism · Blueschists · Eclogites · Greenschists · Basaltic protoliths IntroductionHigh-pressure/low-temperature (HP-LT) rocks are remnants of ancient subduction zones. They provide information on geochemical processes and deep fluid-rock interactions occurring at present-day active convergent margins. Fluid infiltration during high-and lowtemperature hydrothermal alteration of the oceanic crust at mid-ocean ridges and on the seafloor is responsible for the hydration of basic rocks and serpentinisation of the lithospheric mantle. During subduction, the hydrothermally altered oceanic crust dehydrates continuously and releases large amounts of H 2 O at a relatively shallow level in the subduction zone (50-80 km) (Schmidt and Poli 1998;Rüpke et al. 2004). Deserpentinisation of the lithospheric mantle occurs at deeper levels (100-200 km), where fluids are expected to be the source of arc melting (Ulmer and Abstract Characterisation of mass transfer during subduction is fundamental to understand the origin of compositional heterogeneities in the upper mantle. Fe isotopes were measured in high-pressure/low-temperature metabasites (blueschists, eclogites and retrograde greenschists) from the Ile de Groix (France), a Variscan high-pressure terrane, to determine if the subducted oceanic crust contributes to mantle Fe isotope heterogeneities. The metabasites have δ 56 Fe values of +0.16 to +0.33‰, which are heavier than typical values of MORB and OIB, indicating that their basaltic protolith derives from a heavy-Fe mantle source. The δ 56 Fe correlates well with Y/Nb and (La/Sm) PM ratios, which commonly fractionate during magmatic processes, highlighting variations in the magmatic protolith composition. In addition, the shift of δ 56 Fe by +0.06 to 0.10‰ compared to basalts may reflect hydrothermal alteration prior to subduction. The δ 56 Fe decrease from blueschists (+0.19 ± 0.03 to +0.33 ± 0.01‰) to eclogites (+0.16 ± 0.02 to +0.18 ± 0.03‰) reflects small variations in the protolith composition, rather than Fe fractionation

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First experimental determination of iron isotope fractionation between hematite and aqueous solution at hydrothermal conditions

Cited by 48 publications

References 100 publications

Isotope Fractionation Processes of Selected Elements

Isotope Fractionation Processes of Selected Elements

The control of carbonate mineral Mg isotope composition by aqueous speciation: Theoretical and experimental modeling

Iron isotope fractionation in subduction-related high-pressure metabasites (Ile de Groix, France)

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