Typical textures and mineralogical contents, in thin sections, of the dated orthogneiss (A & B, sample PB-18-3), microgranodiorite (C & D, sample PB-18-2) and dolerite (E & F, sample PB-18-1) from Port-Béni. Plan polarized light (A, C & E) and cross-polarized light (B, D & F). Ap: apatite; Bt: biotite; Cpx: clinopyroxene; Cpx(p): clinopyroxene pseudomorph; Ep: epidote (in a vein, A &B); Hbl: hornblende; Op: opaque mineral; Or: orthoclase; Pl: plagioclase; Qtz: quartz.