Metasomatism on the basal peridotite of the Oman ophiolite: an analog of slab-mantle interaction

Abstract

We described petrological and geochemical characteristics of basal peridotites of Oman ophiolite overlying metamorphic sole as an analogue of slab-mantle interface in the mantle wedge. The basal peridotites are slightly serpentinized lherzolite, commonly containing amphiboles (hornblende and tremolite). Clinopyroxene and hornblendes in peridotites close to the boundary have LREE and LILE-enriched characters. The basal peridotites were surely hydrated at relatively high temperatures, and LREE and some LILE are added to them during the hydration.