Geochemistry and mineral chemistry of pelitic gneiss of Ikare area, southwestern Nigeria.

This study conducts Electron Probe Microanalysis (EPMA), X-ray Fluorescence (XRF) and Laser Ablation Inductively Coupled Plasma Spectrometry (LA-ICP-MS) analysis on the pelitic gneiss of the Basement complex of Nigeria. Phase equilibrium modeling was undertaken in the MnO-NaO-CaO-KO-FeO-MgO-AlO-SiO-HO-TiO-O (MnNCKFMASHTO) chemical system using THERMOCALC. The rock comprises of sillimanite + biotite + garnet + K-feldspar + quartz + ilmenite + plagioclase ± cordierite.