Evolution of chalcophile elements in the magmas of the Bonin Islands

Melt inclusions and submarine volcanic glasses of boninitic composition are well preserved in beach sands from the islands of Chichijima and Mukojima along the Bonin Ridge. Volcanic glass as well as orthopyroxene- and spinel hosted melt inclusions in these sands span almost the entirety of boninite series melt compositions, ranging from >18 wt% to <0.5 wt% MgO. Copper, V and other trace metals were tracked over the entirety of the boninite range...