Host: Japan Association of Mineralogical Sciences
Halogens are powerful tracers of subducted water. In order to investigate the influence of slab-derived fluids and the phase which control halogens in the mantle wedge, halogens of mantle xenoliths from volcanic fronts (Avacha and Pinatubo) and rear-arc region (Ichinomegata) were determined. Iodine-rich slab-derived halogens strongly extend into the mantle beneath volcanic fronts. Contributions from various components were found in the rear-arc region and they seem to be controlled by halogens in clinopyroxenes.