Magma Redox Geochemistry - Группа авторов

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also from the preservation of anomalous compositions of the short‐lived isotopes, which must date back to processes occurring during the first several 100 Ma, in magmas erupted throughout the Archean and even to this day (e.g., Rizo et al., 2016; Horan et al., 2018). Factors possibly contributing to retarded mantle homogenization include grain size (Foley & Rizo, 2017) and the strength of bridgmanite under lower mantle conditions (Girard et al., 2016). Vertical mixing of oxidized material left after core formation would eventually have been aided by the establishment of plate tectonics (Andrault et al., 2018), bearing in mind that the transition to sustained plate tectonics occurred late (3.2–2.5 Ga; Cawood et al., 2019) relative to the onset of upward mixing, sometime between the post‐core formation establishment of fO2 in the uppermost mantle of ~ΔFMQ‐4.5 (Frost and McCammon, 2008) and the significantly more oxidizing source fO2 recorded by 3.5 Ga komatiites (Fig. 2.3b; Nicklas et al., 2018).

      V.S. acknowledges financial support from Sapienza University of Rome through “Bandi di Ateneo 2016 and 2019.” The Deutsche Forschungsgemeinschaft is acknowledged for funding under grant AU356/10 to S.A. The authors are grateful to two anonymous reviewers for their constructive comments.

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