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Abstract
The present work is a petrological, geochemical and mineralogical study of Wadi Hammariya area which located in the central Eastern Desert of Egypt. The majority of this area is covered mainly by two lithologically different units, these are: dismembered ophiolite assemblage (serpentinites and their derivatives, metagabbros & amphibolites and metavolcanics) and metamorphosed island arc association (metavolcanics and volcaniclastic metasedimentary rocks).
The ophiolite assemblage comprises peridotite serpentinites, metapyroxenites, antigorite chrysotile serpentinites, carbonate chrysotile serpentinites, talc antigorite carbonate serpentinites; tremolite-actinolite chrysotile antigorite schists, chloritite (chlorite schist), talc-carbonate rocks, pyroxene- hornblende metagabbros, hornblende metagabbros, leuco-metagabbros (quartz metagabbros), amphibolites, spilitic metabasalts and metabasaltic andesites. This ophiolitic assemblage has been metamorphosed up to green schist facies. Geochemical analysis of the present ophiolitic assemblage suggest that the present serpentinites belong to supra-subduction zone ophiolites and can be compared with the ophiolitic mafic-ultramafic cumulates. The metagabbros, amphibolites and metavolcanics are of tholeiitic affinity, referring to oceanic gabbros and MORB tectonic settings and can be compared with ophiolitic cumulates. The opaque mineralogical investigation reveals that serpentinites are enriched (up to 12% by vol.) by homogeneous and zoned chromite together with magnetite. The metagabbros are ilmenite and titanomagnetite bearing rocks (up to 5% by vol.). Amphibolites are depleted in opaques (<0.85% by vol.), being represented by fine ilmenite, sphene and magnetite grains.
Aim and Scope of the present work
1) The preparation of a detailed geological map (Fig 2-1), scale 1: 125,000 for Wadi Hammariya and the surrounding areas.
2) Field study of the selected area, particularly the dismembered ophiolite succession, ophiolitic mélange and island arc association, and pointing to the field relation with the other rock units.
3) Petrographic investigations by using the polarized microscope to make a
complete description and classification for the different rock types and
.