Did Yemeni Tertiary granites intrude neck zones of a stretched continentalupper crust?

We demonstrate that the Miocene alkali granites of Yemen which emplaced alo ng the Great Escarpment are contemporaneous with the stretching of the sout hern Red Sea continental crust, There is a gradient of Miocene extension to wards the granites as well as a change of the geometry of tilted blocks aro und them. Geometrical ly, most of these granites seem to be emplaced passiv ely in the necked areas of a stretched continental crust. These necked area s correspond to previous syn-plume Oligocene NNW-SSE to N-S trending areas of localized extension marked by basaltic dyke swarms. These early extensio nal areas were associated with the emplacement of the flood basalt volcanic pile and were probably localized over large basement discontinuities.