Simplified lithological log of drill core 21 (1:200); for more detailed scale log, see Supplementary Materials 2. The log shows the measured mean An content (molar %) ± 2σ of plagioclase in anorthosite, altered anorthosite and leucogabbro layers across the drill core. The composition of both anorthosite and leucogabbro parts are shown for transitional domains. For mineral data, see Supplementary Materials 3—Tables S1 and S2 and Mineral Chemistry section.