GEOCHEMISTRY AND GEOTECTONIC SIGNIFICANCE OF NEOPROTEROZOIC OPHIOLITIC PERIDOTITES AND PYROXENITES: KAB AMIRI, EASTERN DESERT, EGYPT
DOI:
https://doi.org/10.24040/actaem.2018.20.1.38-45Keywords:
neoproterozoic, ophiolites, forearc, Raman spectroscopy, EgyptAbstract
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 supra-subduction zone environment. The clinopyroxenes chemistry reflect the strong affinity of pyroxenitestoward the intra-oceanic 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.
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