Located about northwestward of Cagliari along the southwestern coastline, Arbus' region, from a geological point of view, is dominated by low-grade metamorphics intruded, in late-Variscan times, by granodioritic and leucogranitic magmas forming the so called "Arbus igneous pluton". This pluton emplaced at 304 ± 1 Ma (U-Pb dating on zircons), along a thrust surface separating a pile of allochtonous tectonic units from the Foreland. This age, inside the correlated error, is undistinguishable from 305 ± 13 Ma obtained with Rb/Sr isochron for granodiorites. Remarkably, in the wide compositional spectrum of late-Variscan magmatism from Sardinia, the Arbus intrusives are quite distinctive. Indeed, granodiorites contain ortopyroxene and clynopyroxene in addition to ubiquitous dark mica, while leucogranites show often sub-vertical centimetric cloths of Fe-cordierite with quartz intergrowths or greenish to bluish tourmaline.