Coexistence of high-Al and high-Cr chromite orebodies in the Acoje block of the Zambales ophiolite, Philippines: Evidence for subduction initiation

•Parental magmas of all Acoje chromitites originated from harzburgitic sources.•The Acoje peridotites had reacted with parental magmas of different chromitites.•The Acoje mantle wedge was infiltrated by tiny amounts of slab-derived fluids.•Coexistence of high-Al and high-Cr chromitites evidences subduction initiation.