Nyiragongo volcanic eruptions of 1977 and 2002 emitted silica-undersaturated lavas named melilite-nephelinites with microlithic to sub-porphyritic textures, consisted olivine, clinopyroxene (augite), phlogopite, melilite, magnetite, rare plagioclases. This melilite-nephelinite as an evolved rock, shows low SiO2 (38.40 - 39.52 wt%) MgO (3.10 4.01 wt%), relatively high FeOt (13.76 14.10 Al2O3 (15...

A new classification of kelyphitic rims on garnets from xenoliths peridotitic and eclogitic parageneses the mantle section under Udachnaya-East kimberlite pipe (Yakutia) is presented. Five types are identified: Rim1 develops between garnet olivine/pyroxene (or rim2) composed high-alumina pyroxenes, spinel, phlogopite; rim2, coarse grain part rim1, located rim1 olivine/pyroxene, mainly consists ...