Articles | Volume 11, issue 2
https://doi.org/10.5194/se-11-307-2020
https://doi.org/10.5194/se-11-307-2020
Research article
 | 
10 Mar 2020
Research article |  | 10 Mar 2020

Tracing fluid transfers in subduction zones: an integrated thermodynamic and δ18O fractionation modelling approach

Alice Vho, Pierre Lanari, Daniela Rubatto, and Jörg Hermann

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Cited articles

Abers, G. A., van Keken, P. E., Kneller, E. A., Ferris, A., and Stachnik, J. C.: The thermal structure of subduction zones constrained by seismic imaging: Implications for slab dehydration and wedge flow, Earth Planet. Sc. Lett., 241, 387–397, https://doi.org/10.1016/j.epsl.2005.11.055, 2006. 
Ague J. J. and Nicolescu, S.: Carbon dioxide released from subduction zones by fluid-mediated reactions, Nat. Geosci., 7, 355–360, https://doi.org/10.1038/ngeo2143, 2014. 
Airaghi, L., Lanari, P., de Sigoyer, J., and Guillot, S.: Microstructural vs compositional preservation and pseudomorphic replacement of muscovite in deformed metapelites from the Longmen Shan (Sichuan, China), Lithos, 282, 262–280, https://doi.org/10.1016/j.lithos.2017.03.013, 2017. 
Albarède, F.: The survival of mantle geochemical heterogeneities, Washington DC American Geophysical Union Geophysical Monograph Series, 160, 27–46, https://doi.org/10.1029/160GM04, 2005. 
Alt, J. C., Muehlenbachs, K., and Honnorez, J.: An oxygen isotopic profile through the upper kilometer of the oceanic crust, DSDP Hole 504B, Earth Planet. Sc. Lett., 80, 217–229, https://doi.org/10.1016/0012-821X(86)90106-8, 1986. 
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Short summary
This study presents an approach that combines equilibrium thermodynamic modelling with oxygen isotope fractionation modelling for investigating fluid–rock interaction in metamorphic systems. An application to subduction zones shows that chemical and isotopic zoning in minerals can be used to determine feasible fluid sources and the conditions of interaction. Slab-derived fluids can cause oxygen isotope variations in the mantle wedge that may result in anomalous isotopic signatures of arc lavas.