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ical compositions are used to identify primitive picrite basalts from the early part of flood basalt successions in the western part of the Emeishan large igneous province (ELIP), southwestern China. The Fo contents of olivine phenocrysts of komatiites with MgO ~21.79 wt% range from 85.2% to 91.4%. The composition of unerupted parental melts is calculated from the compositions of the most Fo-rich olivine phenocrysts. These melts had ~22 wt% MgO, and originated in mantle with a potential temperature of ~1600 ̊C and at about 4.2 GPa pressure, supporting the conclusion that the generation of ELIP can be attributed to melting of a plume head beginning at ~138 km depth.

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Mantle plume activity and melting conditions: Evidence from olivines in picritic-komatiitic rocks from the Emeishan Large Igneous Province, southwestern China