Figure F95. CaO vs. Al2O3 for peridotites from Site 1270. Sample 209-1270D-3R-1, 63-66 cm, is displaced from the other peridotites because of the presence of a gabbroic dike in the analyzed sample. The dashed line shows the trajectory expected for a melting residue of peridotite that initially had a Bulk Earth composition. Sample 209-1270D-1R-1, 70–74 cm, is enriched in CaO due to secondary carbonate precipitation.

Figure F95. CaO vs. Al₂O₃ for peridotites from Site 1270. Sample 209-1270D-3R-1, 63-66 cm, is displaced from the other peridotites because of the presence of a gabbroic dike in the analyzed sample. The dashed line shows the trajectory expected for a melting residue of peridotite that initially had a Bulk Earth composition. Sample 209-1270D-1R-1, 70–74 cm, is enriched in CaO due to secondary carbonate precipitation.