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

George R. Tilton and Barbara A. Barreiro
Science
New Series, Vol. 210, No. 4475 (Dec. 12, 1980), pp. 1245-1247
Stable URL: http://www.jstor.org/stable/1684482
Page Count: 3
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Origin of Lead in Andean Calc-Alkaline Lavas, Southern Peru
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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.

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