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The Kab Amiri ultramafic ophiolitic section comprises highly serpentinites and pyroxenites. The Kab Amiri ophiolite suite represents fragments of oceanic lithosphere that are developed in forearc setting in a suprasubduction zone environment. The clinopyroxenes chemistry reflect the strong affinity of pyroxenitestoward the intraoceanic forearc boninites. Serpentinites have been most likely formed directly from mantle-wedge olivine above the slab in which the fluids driven for the slab cause strong hydration and cooling of peridotites during an early stage of serpentinization. Pyroxenites show a very close relation to the serpentinites, which reflect that both are co-genetic with the rest of the mantle suite. Thus, the pyroxenites genesis is directly related to the contamination of their mantle source by crustal material and/or subduction-related slab fluids during mantle evolution in supra subduction zone setting.

Geochemistry and geotectonic significance of neoproterozoic ophiolitic peridotites and pyroxenites: KAB AMIRI, EASTERN DESERT, EGYPT