Behavior of fluid-mobile elements in serpentines from abyssal to subduction environments: Examples from Cuba and Dominican Republic

► Mantle wedge and subducted serpentinites are both enriched in fluid-mobile elements. ► All serpentines show interaction with seawater- and sediment-derived fluids. ► Contamination by sediment-derived fluids is the strongest in high-grade subducted samples. ► This contamination occurs at the lz/atg transition in the subduction channel.