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Primitive basalts were erupted from more than 100 monogenetic eruption centres within the Macolod Corridor, an extensional structure which cross-cuts the Taiwan-Luzon volcanic arc. The composition of early phenocrysts, HFSE systematics and relatively high Al 2 O 3 , TiO 2 and Na 2 O contents of these rocks suggest that they are derived from sources comparable to the sources of MORB and back-arc basin basalts. This is in contrast to many other arc magmas which appear to be derived from more depleted sources. High LILE abundances and high LILE/HFSE ratios indicate the presence of slab-derived components in the magmas, although the Macolod Corridor is no longer underlain by an actively subducting slab.

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