Homogénéité ou hétérogénéité dans le métal des dépôts de l’Âge du Bronze : estimations sur leur formation à partir des isotopes du plomb

Abstract

Lead isotope analysis was applied to three representative Late Bronze Age hoards from the Iberian Peninsula, for all of which compositional analyses are available. Unpublished isotopic evidence from the cave of Muricecs (Lleida) and the settlement of Las Lunas (Toledo) are compared to the published results for weapons from the Ría de Huelva, one of the most important Late Bronze Age hoards from Western Europe. Lead isotope analysis can tell us the sources of the metal used to make the artifacts in each hoard. The limited number of geologic reference points makes it difficult to determine all of the ore sources, but the analyses do give us evidence about the degree of homogeneity of the metal in the artifacts. As a result, one can separate metallic composition from artifact typology and thereby evaluate how the hoards were formed and what their functions were. Elemental analysis is unsuitable for this purpose because Late Bronze Age metals from Iberia are very homogenous and have few impurities.