Basaltic melts of Ocean Islands (OIB) and their sources estimated from the investigation of melt inclusions and quenched glasses of rocks

Using our updated database of published analyses of mineral-hosted melt inclusions and glasses from volcanic rocks, the compositions of mafic melts of ocean islands (OIB) were considered. Mean contents of major, trace, and volatile elements were calculated for the complete data array and some particular comprehensively studied complexes: Iceland, Hawaii, Canaries, Galapagos, and Reunion. It was found that the mean contents of most elements fall between the compositions of magmas from mid-ocean ridges (most depleted) and intraplate continental environments (most enriched). A detailed analysis of element ratios in the magmatic complexes showed that they could be approximated as mixtures of magmas from one depleted and two enriched reservoirs. The contents of trace elements in the supposed mantle sources were calculated. The depleted source is best manifested in Iceland and almost exactly matches the composition of the depleted mantle, from which mid-ocean ridge basalts were derived.