Deep tectonics of Northern Eastern Desert of Egypt a integrated from gravity and seismic data

الملخص EN

-Deep tectonics of the northern part of the Easte rn Desert.

between latitudes 25°·2W'N, are delineated using two-dimensional (2-0) modelling of the gravity field , supplemented with deep sounding seismic (OSS) data .

Basement .

Conrad and Moho discontinuities depth maps are prepared based on ten 2-0 density models covering almost the study area.

Obtained results .

integrated with surface and subsurface geol ogic information.

show that the study area could be subdivided into two distinct tectonic blocks of different crustal types and isostatic characters.

The first block comprises the coastal zone of the Red Sea and is characterized by isostatically uncompensated transitional crust.

Its average thickness is 18-22 km and may have been subjected 10 stretching.

The second block includes the Red Sea mountainous zone, represented by more or less iso statically compensated continental crust of thickness ranging between 28-34 km.