The primary melt compositions of the basalts are mostly picritic.
J. G. Shellnutt, Thuy T. Pham 2018, 'Mantle Potential Temperature Estimates and Primary Melt Compositions of the Low-TiEmeishan Flood Basalt', Frontiers in Earth Sciencehttps://www.frontiersin.org/article/10.3389/feart.2018.00067/full. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Picritic melt rose from convective mantle to the crust and formed a magma chamber.
M. Nironen 2017, 'The Salittu Formation in southwestern Finland, part II: Picritic-basaltic volcanismin mature arc environment', Bulletin of the Geological Society of Finlandhttp://www.geologinenseura.fi/bulletin/Volume89/Bulletin_vol89_1_5-19_2017_Nironen.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)