Geophysical Journal | 2006 volume 28 5

Oxidation-reduction conditions in the lithosphere and mantle magmogenesis

© Genshaft Yu.S.

Oxidation-reduction conditions in the rocks of lithosphere and in magmatic rocks are considered, which are determined by the ratio of bivalent and trivalent iron in minerals of deep-seated rocks and by the balance hemoilmenite- titanomagnetite. In magmas fO2 is close to buffer conditions QFM (quartz-fayalite-magnetite) and NNO (nickel-nickel oxide), while in the rocks of lithosphere the range of fO2 alterations is much more, and these conditions depend on the rock types, their depletion, metasomatic alterations etc.

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