title: Origin of lead in andean calc-alkaline lavas, southern peru.
abstract: Lead isotope data from Quaternary andesitic lavas of the Arequipa and Barroso groups of southern Peru and from regional Precambrian granulitic gneisses reveal a lead component in the lavas from the gneisses. The lava leads can be accounted for by two-component mixtures of lead from mantle and lower crustal sources, although the mixing process need not have occurred in the lower crust.
authors.forename: G R
authors.initials: GR
authors.lastname: Tilton
authors.forename: B A
authors.initials: BA
authors.lastname: Barreiro