Recycled calcium carbonate is an efficient oxidation agent under deep upper mantle conditions
Ca carbonate transported by subducting slabs could explain elevated ferric iron content in the upper mantle through redox reactions with Fe3+ garnet and graphite as products, according to high-pressure, high-temperature experiments.
More detail at https://www.nature.com/articles/s43247-021-00116-8.
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Abstract:
Observations of high ferric iron content in diamond garnet inclusions and mantle plume melts suggest a highly heterogeneous distribution of ferric iron in the mantle. Re...