The current ENE-directed convergence of ∼20 mm/a between the Caribbean and North American plates in southern Hispaniola (Dominican Republic and Haiti; Figure 1) accommodates partly by northward underthrusting/subduction below the Muertos accretionary prism. To the W, convergence adjusts partially by folding and faulting related to collision between the Beata Ridge, a large bathymetric feature on the Caribbean plate, and the back-arc edge of the Caribbean island-arc (Hernáiz-Huerta,

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The process of intra-oceanic subduction brings an oceanic slab under an overriding oceanic slab resulting in the formation of a convergent plate margin. Consequently, an oceanic island arc is formed in the upper plate, as is the case of the magmatically active arcs of Izu-Bonin-Mariana, South Sandwich and Lesser Antilles (Arculus et al., 2015;Leat & Larter, 2003;Stern, 2010). Unlike continental magmatic arcs, intra-oceanic arcs are less studied because a large part of them is located below sea level, emerging as chains of small islands that constitute just the tops of large submarine volcanoes. Despite these difficulties, the magmatic processes in intra-oceanic arcs have been directly and indirectly studied from: (a) lower crust and upper mantle xenoliths erupted in