Fig. S2. Permian–Triassic felsic tuffs in South Island, New Zealand: significance for oceanic and active continental margin subduction

Major-element oxide variation plots for the Maitai Group and the Murihiku Terrane. (a)–(f) Maitai Group: (a) Al<sub>2</sub>O<sub>3</sub> v. SiO<sub>2</sub>; (b) Fe<sub>2</sub>O<sub>3</sub> v. SiO<sub>2</sub>; (c) MgO v. SiO<sub>2</sub>; (d) MnO v. SiO<sub>2</sub>; (e) TiO<sub>2</sub> v. MgO; (f) Fe<sub>2</sub>O<sub>3</sub> v. MgO. (g)–(i) Murihiku Terrane: (g) Fe<sub>2</sub>O<sub>3</sub> v. SiO<sub>2</sub>; (h) MgO v. SiO<sub>2</sub>; (i) TiO<sub>2</sub> v. Al<sub>2</sub>O<sub>3</sub>. See text and the Supplementary field and petrographic information for explanation.