Origin of Lead in Andean Calc-Alkaline Lavas, Southern Peru

Science  12 Dec 1980:
Vol. 210, Issue 4475, pp. 1245-1247
DOI: 10.1126/science.210.4475.1245


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.