Analyse de la sédimentation post-phase sarde: les dépôts initiaux à placers du SE de la Sardaigne

The Punta Serpeddi Formation (Caradoc-Ashgill) of Sardinia is composed of platform facies deposits accumulated in a sedimentary environment dominated by storm processes. Petrographic studies reveal that these sediments are rich in heavy minerals (up to 12% by volume; the clastic supply probably came from the erosion of four main source-areas: -pre-Caradocian volcanic units belonging to the «Porfidi grigi»; -Cambro-Ordovician deposits of the «Arenarie di San Vito» -a basic mantellic rock not identified; -a cratonic source-area situated in the NE of Sardinia