Journal
GEOLOGY
Volume 44, Issue 3, Pages 215-218Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G37565.1
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Funding
- Natural Environment Research Council (NERC) Deep Volatiles Consortium Grant [NE/M000303/1]
- European Research Council (ERC) Starting Grant (HabitablePlanet) [306655]
- ERC Starting Grant (MASE) [279828]
- NERC Advanced Fellowship [NE/F014295/1]
- Natural Environment Research Council [NE/M000427/1, NE/F014295/2, NE/K000411/1, NE/M011801/1, NE/F014295/1] Funding Source: researchfish
- NERC [NE/M000303/1, NE/K000411/1, NE/M000427/1, NE/F014295/2, NE/M011801/1, NE/F014295/1] Funding Source: UKRI
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Subduction zones are one of the most important sites of chemical interchange between the Earth's surface and interior. One means of explaining the high Fe3+/Sigma Fe ratios and oxidized nature of primary arc magmas is the transfer of sulfate (SOX), carbonate (CO3-), and/or iron (Fe3+) bearing fluids from the slab to the overlying mantle. Iron mobility and Fe stable isotope fractionation in fluids are influenced by Fe redox state and the presence of chlorine and/or sulfur anions. Here we use Fe stable isotopes (delta Fe-56) as a tracer of iron mobility in serpentinites from Western Alps metaophiolites, which represent remnants of oceanic lithosphere that have undergone subduction-related metamorphism and devolatilization. A negative correlation (R-2 = 0.72) is observed between serpentinite bulk delta Fe-56 and Fe3+/Sigma Fe that provides the first direct evidence for the release of Fe-bearing fluids during serpentinite devolatilization in subduction zones. The progressive loss of isotopically light Fe from the slab with increasing degree of prograde metamorphism is consistent with the release of sulfate-rich and/or hypersaline fluids, which preferentially complex isotopically light Fe in the form of Fe(II)-SOX or Fe(II)Cl-2 species. Fe isotopes can therefore be used as a tracer of the nature of slab-derived fluids.
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