Fig. 7. Pyroxene compositions in the Rio Boba mafic-ultramafic plutonic sequence. (a) TiO2–Na2O–SiO2/100 (wt.%) discrimination diagram for clinopyroxene (Beccaluva et al., 1989). Fields representing clinopyroxene compositions in basalts from modern oceanic settings are reported for comparison (Saccani and Photiades, 2004). Abbreviations: N-MORB, normal MORB; E-MORB, enriched MORB; ICB, Iceland basalts; IAT, island arc tholeiites; Bon, boninites; B-BA, intra-oceanic fore-arc basalts and basaltic andesites. (b) Mg# versus Al2O3 (wt.%) for clinopyroxene. (c) Mg# versus Al2O3 (wt.%) for orthopyroxene. (d) Mg# versus TiO2 (wt.%) for clinopyroxene. Fields for arc-related mantle pyroxenites, arc crustal pyroxenites and arc-related mafic cumulates are from Berly et al. (2006) and references therein. Field for SSZ (fore-arc) peridotites is from Bodinier and Godard (2007). Fields for ocean ridge cumulates and Izu–Bonin arc volcanic rocks are from Marchesi et al. (2006 and references therein). Compositions of Puerca Gorda mafic metavolcanic rocks and fields of Puerto Plata complex rocks and La Cuaba harzburgites are from Escuder-Viruete et al. (2014) and Escuder-Viruete and Castillo-Carrión (2016).