1.
Science
; 210(4475): 1245-7, 1980 Dec 12.
Artigo
em Inglês
| MEDLINE
| ID: mdl-17810771
RESUMO
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.