Data for <b><i>Calcium isotopic compositions of eclogite melts and negligible modification during reaction with lithospheric mantle</i></b>

This dataset includes (1) Chemical and isotopic compositions of the potassic basalts from northeast China in this study (Table S1) and standards (Tables S2-3); (2) Melting of MORB-like eclogite and peridotite with evolving modal composition in melting residue (Tables S4-5); and (3) Modelling the reaction between initial melts and lithospheric mantle (Table S6).