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Redox transfer at subduction zones: insights from Fe isotopes in the Mariana forearc

B. Debret1,

1Université de Paris, Institut de physique du globe de Paris, CNRS UMR 7154, 1 rue Jussieu, 75005 Paris, France

C.D.J. Reekie2,

2Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK

N. Mattielli3,

3Laboratoire G-Time, DGES, Université Libre de Bruxelles, ULB, CP 160/02, 1050 Brussels, Belgium

H. Beunon3,

3Laboratoire G-Time, DGES, Université Libre de Bruxelles, ULB, CP 160/02, 1050 Brussels, Belgium

B. Ménez1,

1Université de Paris, Institut de physique du globe de Paris, CNRS UMR 7154, 1 rue Jussieu, 75005 Paris, France

I.P. Savov4,

4School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom

H.M. Williams2

4School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Debret, B., Reekie, C.D.J., Mattielli, N., Beunon, H., Ménez, B., Savov, I.P., Williams, H.M. (2020) Redox transfer at subduction zones: insights from Fe isotopes in the Mariana forearc. Geochem. Persp. Let. 12, 46–51 .

Funding for this research was provided by a NERC Moratorium Award (NE/P020860/1), the F.R.S.-F.N.R.S., the Fondation Wiener Anspach (RG97553), the ERC Consolidator Grant (306655), a NERC Critical Minerals grant (NE/M010848/1) and a Schlanger Fellowship Award. This study contributes to the IdEx Université de Paris ANR-18-IDEX-0001.

Geochemical Perspectives Letters v12  |  doi: 10.7185/geochemlet.2003
Received 15 August 2019  |  Accepted 10 December 2019  |  Published 31 January 2020
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY-NC-ND 4.0




Figure 1 Distribution of δ56Fe values in forearc serpentinites. (a) Bathymetry map of the Mariana subduction system showing the locations of the mud volcanoes drilled during IODP Expedition 366 and the ODP Leg 195. Hole locations are indicated in red circles. (b) Iron isotope compositions of bulk ultramafic clasts from the Mariana forearc, organised according to the distance from the trench. DM: Depleted Mantle (Craddock et al., 2013

Craddock, P.R., Warren, J.M., Dauphas, N. (2013) Abyssal peridotites reveal the near-chondritic Fe isotopic composition of the Earth. Earth and Planetary Science Letters 365, 63–76.

).
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Figure 2 Plots of δ56Fe versus (a) B concentrations, (b) As/Yb and (c) Fe3+/ΣFe ratios in Mariana ultramafic clasts. The black bar represents the FeCl standard reproducibility during analyses. DTS-1, DTS-2b, JP-1: dunite-like reference materials.
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Figure 3 Cartoon illustrating redox and isotopic transfers between the slab and the forearc mantle wedge.
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