الفهرس 
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Abstract
Neoproterozoic rocks ofMeatiq area were deformed and metamorphosed during the
Pan-African orogeny (650-550 Ma; Kennedy 1964). The rocks of Meatiq area are
arranged in structural orders. They were classified on the basis of tectono-
stratigraphy into two main categories; Meatiq and Atalla Successions. Meatiq
Succession is subdivided into three FOlmations; Um Esh EI-Hamra, Abu Zohleiqa
and Abu Fannani. These rock units are composed mainly of psammitic and pelitic
schists.
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Atalla Succession IS composed mainly of ophiolitic-island arc assemblage
structurally intercalated with the deformed dismembered Hammamat sediments. The
tectonic pile of the rocks has been intruded by four granitic plutons, which were
emplaced at various stages in the tectonic history.
A series of large-scale thrust duplexes with major folds and shear-zones are
structurally dominated the area. A complex polyphase structural history has been
deduced consisting of earlier ductile and late more brittle defolmation phases. The
structural investigation of the area reveals five deformation phases affecting the rocks
of the area. The DJ structures are folds, thrust faults and shear zones directed NW-
SE. The D2 structures include the Atalla shear zone and NW-SE oriented folds. The
D3 structures including NNW-SSE thrust faults. The D4 is represented by the N-S,
NW-SE and NE-SW strike-slip faults. Finally, the D5 is represented by NE-SW
normal faults due to post orogenic extension.
Meatiq area is affected by brittle- ductile shear zones; Meatiq and Atalla shear zones.
Both of them display left-lateral sense of shear. The vorticity analysis demonstrated
that MSZ is sub-simple shear; while Atalla shear zone is pure and simple shear.
Based on the high resolution satellite images, field and petrographic studies the
previously described ”Meatiq gneiss dome and Um Baanib granite gneiss are now
oblate Meatiq diapiric dome and Urn Baanib deformed granite respectively. Oblate
Meatiq diapiric dome is composed of two sub-domes; Um Baanib and Urn Esh El
Hamra. The two sub-domes are separated by Abu Zohleiqa synform.