Nyiragongo volcanic eruptions of 1977 and 2002 emitted silica-undersaturated lavas named melilite-nephelinites with microlithic to sub-porphyritic textures, and consisted of olivine, clinopyroxene (augite), phlogopite, melilite, magnetite, and rare plagioclases. This melilite-nephelinite as an evolved rock, shows low SiO 2 (38.40 -39.52 wt%) and MgO (3.10 -4.01 wt%), and relatively high FeOt (13.76 -14.10 wt%), Al 2 O 3 (15.01 -16.48 wt%), CaO (11.00 -12.29 wt%) and Na 2 O + K 2 O (10.34 -11.85 wt%). Unlike LA-ICP-MS on silicate melt inclusions (SMIs) hosted in augite show a pristine melt of picrobasaltic (low Ti-picrite) rock poor in SiO 2 (31.14 -32.26 wt%), FeOt (2.19 -2.79 wt%), Al 2 O 3 (8.01 -9.57 wt%), and Na 2 O + K 2 O (2.34 -3.05 wt%), while enriched in .17 wt%). The sums (∑REEs) for lavas and SMIs are ranging 712 -799 and 43 -119 ppm respectively. REE contracted multi-element patterns showed a W-feature for most lavas except for SMIs. High Rb/Sr, and low Ba/Rb, Zr/Nb, and Sm/Hf ratios of lavas suggest a phlogopite-rich source of materials.