Articles | Volume 15, issue 9
https://doi.org/10.5194/se-15-1143-2024
https://doi.org/10.5194/se-15-1143-2024
Research article
 | 
16 Sep 2024
Research article |  | 16 Sep 2024

Magnesium isotope fractionation processes during seafloor serpentinization and implications for serpentinite subduction

Sune G. Nielsen, Frieder Klein, Horst R. Marschall, Philip A. E. Pogge von Strandmann, and Maureen Auro

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Cited articles

Bach, W. and Früh-Green, G. L.: Alteration of the oceanic lithosphere and implications for seafloor processes, Elements, 6, 173–178, 2010. 
Beinlich, A., Mavromatis, V., Austrheim, H., and Oelkers, E. H.: Inter-mineral Mg isotope fractionation during hydrothermal ultramafic rock alteration – Implications for the global Mg-cycle, Earth Planet. Sc. Lett., 392, 166–176, 2014. 
Bigeleisen, J. and Mayer, M. G.: Calculation of Equilibrium Constants for Isotopic Exchange Reactions, J. Chem. Phys., 15, 261–267, 1947. 
Brewer, A. W., Teng, F.-Z., and Mullen, E.: Magnesium isotopes as a tracer of crustal materials in volcanic arc magmas in the northern Cascade Arc, Front. Earth Sci., 6, 21, https://doi.org/10.3389/feart.2018.00021, 2018. 
Carter, L. B., Skora, S., Blundy, J. D., De Hoog, J. C. M., and Elliott, T.: An Experimental Study of Trace Element Fluxes from Subducted Oceanic Crust, J. Petrol., 56, 1585–1605, https://doi.org/10.1093/petrology/egv046, 2015. 
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Short summary
Magnesium isotope ratios of arc lavas have been proposed as a proxy for serpentinite subduction, but uncertainties remain regarding their utility. Here we show that bulk serpentinite Mg isotope ratios are identical to the mantle, whereas the serpentinite mineral brucite is enriched in heavy Mg isotopes. Thus, Mg isotope ratios may only be used as serpentinite subduction proxies if brucite is preferentially mobilized from the slab at pressures and temperatures within the arc magma source region.
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