text: These observations are consistent with the overlap of whole rock Rb–Sr ages; 610–560 Ma for the Dokhan, 600–585 Ma for the Hammamat, and 610–550 Ma for the Younger Granites (Stern, 1979; Stern and Hedge, 1985; Bentor, 1985; Willis et al., 1988; Beyth et al., 1994; Jarrar et al., 2003).