Provenancing of lightweight volcanic stones used in ancient Roman concrete vaulting: Evidence from Rome

This paper presents the geochemical analysis of lightweight scoria and pumice used in concrete vaults from ancient Rome. The geochemical signatures of dark scoria indicates a provenance of the 36-18 ka lavas of Vesuvius, as opposed to the more recent events on which Pompeii was built, as previously thought. The light-coloured pumices analysed, which were originally thought to belong to the Sabatini volcanic system (north of Rome), corresponded instead to products from Campi Flegrei. These results provoke re-evaluation of the trade and acquisition of these specialized materials destined for imperial projects in the capital city.