Fig. 1

Compositional trends in experimental glasses. A wt% SiO₂ vs. wt% MgO in the glasses, B wt% Al₂O₃ vs. wt% MgO, C Mg# (100[Mg/(Mg + Fe)], molar) in the experimental glasses vs. experimental T (°C). Larger symbols are equilibration experiments (labeled E in Table 2); smaller symbols are saturation experiments (labeled S in Table 2). Bulk composition color codes: synHP1 = dark green, (n = 1); synHP1 + Cr + Mn = light green; HAB + Ol + Mn = dark blue; synMORB80 = purple; synMORB60 = red; synMORB40 = light blue. Triangles – 1175 °C; Circles – 1225 °C; Squares – 1300 °C; Diamonds – 1350 °C; Star – 1400 °C. 1σ errors are smaller than the symbol sizes