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Mantle melting, mineralogy and (maybe) magma oceans: the metal stable isotope perspective

Many studies of high-amu stable isotope systems (e.g., Mg, Si, Fe, Ni, Zn, Ti, Ca, Cr, V) in terrestrial magmatic rocks and silicate achondrite meteorites aim to link equilibrium mineral- and redox-specific stable isotope partitioning (equilibrium fractionation) effects with observed variations in isotopic composition, with the objectives of reconstructing the chemistry, mineralogy and redox state of their mantle source regions. In this presentation, I will discuss how these stable isotope systems can be used in conjunction with phase equilibria models to predict the coupled behaviour of different isotope systems during partial melting of different mantle lithologies under different conditions, and the implications for using these isotope systems to reconstruct the mineralogical and chemical evolution of planetary interiors.  

Soderman, C. R., Matthews, S., Shorttle, O., Jackson, M. G., Ruttor, S., Nebel, O., ... & Williams, H. M. (2021). Heavy δ57Fe in ocean island basalts: A non-unique signature of processes and source lithologies in the mantle. GCA

Soderman, C. R., Shorttle, O., Matthews, S., & Williams, H. M. (2022). Global trends in novel stable isotopes in basalts: Theory and observations. GCA


Helen M Williams1, Caroline Soderman2, Simon Matthews1, Ayesha Landon-Browne1
1University of Cambridge, United Kingdom; 2University of Iceland, Iceland
GeoMinKöln 2022