The recent contribution by Braunger et al. (2018) provides a thorough petrographic and geochemical description of peralkaline and carbonatitic igneous rocks from the Kaiserstuhl Volcanic Complex, SW Germany (KVC). These data are used to calculate several intensive variables: temperature (T), pressure (P), silica activity (aSiO2), and oxygen fugacity (fO2), which are then applied to constrain the petrogenesis of the different KVC magma series, including identifying features of their source with an emphasis on redox conditions. Using a variety of thermodynamic equilibria, Braunger et al. (2018) showed that the redox states of the various silicate KVC magmas in intensive-variable space follow...
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Anenburg et al. (2019) studied this question.
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