الفهرس 
ACKNOWLEDGEMENTS
Tectonic SettingOnly 14 pages are availabe for public view
 |  | from | 198 |  |  |
| | | from | 198 | | |
Abstract
The detailed field, petrographic and geochemical studies carried out on the
Wadi Shait area revealed the following main contributions:
Field and microscopic structures within the deformed rocks of the sliced
Gardan ophiolitic melange unit assigned a NW direction of tectonic transport
over the SGC.
The lithologies of the Gardan ophiolitic mélange document the presence of
three metamorphic phases M1, M2 and M3, and their derivation from a less
mature island arc.
The SGC forms an E-W elongate mass affected by four deformation phases
(D1-D4) and underwent retrogressive dynamic metamorphism leading to
transformation of their composing granite varieties of tonalite, trondhjemite,
granodiorite and monzogranite into protomylonites, mylonites and
ultramylonites.
The obtained U-Pb dating on zircon of 820 Ma for the tonalites from SGC
and the conclusion that they represent part of an old immature ensimatic island
arc may indicate that rifting and spreading of Mozambique Ocean was earlier
than such dating.
Since the SGC under consideration is plastically deformed, therefore it
must be included together with the other plastically deformed granite bodies such
as Gabal El-Mayit (Akaad and El-Ramly, 1963), Abu Beit granite (Boghdady,
2000) exposed in the basement complex of Egypt. These granites are believed to
belong to a granite cycle older than the non-deformed granite series (El-Ramly
and Akaad, 1960), syn-to late-orogenic granites (El-Gaby et al., 1988) and Gr.A
granitoids (El-Shatoury et al., 1984).
The Cryogenian Shaitian granite complex (SGC) represents a meta-aluminous to
mildly peraluminous TTG suite comprising distinct granite phases of tonalite