Abstract
The subjects of the research were mantle xenoliths from Cenozoic alkaline basalts in the Baikalian–Mongolian region. The Mossbauer spectroscopy was used to study iron valence in mineral structures. The mineral compositions were analyzed by microprobe technique. The values of ΔlgfO2 for xenoliths is vary: DP: −0.9− (−1.7); TD: −0.9−(−1.8); VP: −0.1–(−0.8); BA: −0.1−(−0.8). p − T equilibrium conditions of mineral association in xenoliths correspond to graphite stability field, ΔlgfO2 values evidence of predominance of CO2 and H2O in the mantle fluid. The heterogeneity in redox state corresponds to thermal heterogeneity. The deduced equation allows estimating the value of oxygen fugacity only the data of chemistry and φSp.
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