The Variscan basement in the western shoulder of the Lusitanian Basin (West Iberian Margin): insights from detrital-zircon geochronology of Jurassic strata

There is no consensus about the geological nature of westernmost portion Iberian Massif. In present research, detrital zircon U–Pb signatures Jurassic strata Lusitanian Basin, known to be west-sourced, are combined with published data for Precambrian-Palaeozoic basement and other Basin units better understand this poorly exposed Cryogenian Ediacaran ages prevail in a northern Upper unit, while Lower rocks southern locations yield mostly Carboniferous upper Permian zircons. These age results, coupled their respective U/Th ratios, suggest that basin covers two distinct terranes Another noteworthy feature west-derived deposits abundance < 310 Ma ages. It proposed combination crustal thinning West Margin regional eastward tilt, favoured enrichment relatively young western shoulder relative its eastern margin. The also reveal middle late thermal event restricted areas, which probably associated oldest stages Alpine extension Iberia.