Abstract
191 The elaboration of monomineral thermobarome ters based on the composition of one phase is a chal lenging task in modern petrology. This is because xenoliths are lacking or rare, and only xenocrysts are available in many mantle derived rocks. Prospecting and exploration for diamonds are commonly con ducted with separate grains of mantle derived associ ated minerals. The estimation of their formation oxy gen fugacity is important both for theoretical petrol ogy and applied purposes. Nowday the oxygen fugacity estimation sensors for garnet olivine orthopyroxene parageneses are known [8, 10]. There is a model of garnet olivine orthopy roxene oxybarometer [4, 10] based on the equilibrium from [2]:
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