Fig. S1. Permian–Triassic felsic tuffs in South Island, New Zealand: significance for oceanic and active continental margin subduction

Major-element oxide variation plots for the Brook Street Terrane. (a) Fe₂O₃ v. SiO₂; (b) MnO v. SiO₂; (c) MgO v. SiO₂; (d) TiO₂ v. Al₂O₃; (e) TiO₂ v. MgO; (f) Fe₂O₃ v. MgO; (g) MnO v. MgO; (h) CaO v. MgO; (i) K₂O v. MgO. See text and the Supplementary field and petrographic information for explanation.