“…1). (Rapela et al 1988;Aragón et al 2011;Iannelli et al 2017), Casa de Piedra Volcanic Complex (Demant, Suárez & De La Cruz, 2007), El Toro Formation (Demant, Suárez & De La Cruz, 2007), Morro Negro basalts (Demant, Suárez & De La Cruz, 2007), Tres Picos Prieto Formation (Zaffarana, Lagorio & Somoza, 2012) and Lonco Trapial Formation (unpub. data) are shown for comparison; the chosen rocks had SiO 2 content less than 70 %.…”