Satellite gravimetry as a powerful tool for delineation of regional tectono-geophysical domains: implementation for the Arabian-African region

Satellite gravimetry is recognized now as powerful and reliable tool for regional tectono-geodynamic zonation. Regular observation grid and comparatively high accuracy (1-1.5 mGal) of satellite gravity data retracked to the Earth’s (together with other kinds of gravity observations) surface makes these data indispensable instrument for examination of deep geological features (mainly, Earth crust and upper mantle). The area under study – Arabian-African region – is very attractive geological-geophysical polygon from geodynamical (high seismic activity, active rift zones and collision processes), structural (presence of mosaic block system of continental and oceanic Earth’s crust of different age), geophysical (presence of several greatest gravity anomalies and intricate magnetic pattern) and economical (occurrence of main hydrocarbon resources of the world) points of view. Examination of satellite derived gravity data by use of advanced qualitative methodologies enabled to develop a series of principal new maps indicating the tectono-geophysical zonation of the region, presence of different types of the Earth’s crust terranes and slabs. Semi-quantitative analysis was applied for determination of the depths of contrast density masses surface in lithosphere. These data were used, together with other isolated geophysical-geological features, for elaboration and generalization of earlier constructed tectonic maps and schemes. On this basis, a new tectonic map of the Arabian-African region has been developed – geological data were supported by satellite gravity (mainly), magnetic, GPS, seismic, seismological and some other geophysical data analysis.