Assimilation of upper plate rocks at convergent margins contributes to the low δ18O isotopic signature of erupted magma

Supplementary Data 1. Analytical major and trace elements and oxygen isotopic ratios of olivine from the Mariana subduction zone. Supplementary Data 2. Analytical major and trace elements of different points in the same olivine from the Mariana subduction zone. Supplementary Data 3. Major element geochemistry (EPMA) of spinels within olivine and corresponding host olivines. Supplementary Data 4. The oxygen isotopic compositions of whole rocks from Mariana subduction zone. Supplementary Data 5. The collected olivine data and cited references in Supplementary Fig. 4. Supplementary Data 6. Analytical results of oxygen isotopes for standard sample of SanCarlos olivine. Supplementary Data 7. Brief description of studied host volcanic rocks.