Abstract
Petrologic and chemical data are presented for samples from Futuna Island, located behind the New Hebrides island arc. Quartz-normative basalts and basaltic andesites are the most abundant lava types. There are mineralogically and chemically similar to the volcanic products of the central-chain volcanic islands (Ambrym and Aoba) and other typical calc-alkaline suites. The lavas are enriched in the LIL elements, and depleted in Ti and other transition elements. Their variations are consistent with fractionation of olivine, Fe-Ti-oxide, pyroxenes (low-Ca and Ca-rich) and plagioclase. Incompatible-element ratios and abundances suggest that primary liquids were generated by complex mechanisms but a mantle source is needed to explain the data; the most consistent problems are the concomitant and strong types of fractionation such as La/Ta and Zr/Y whereas other coupled elements (Nb/Ta, Zr/Ta) show chondritic ratios.
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