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Science 12 December 1980:
Vol. 210. no. 4475, pp. 1245 - 1247
DOI: 10.1126/science.210.4475.1245
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Articles

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

GEORGE R. TILTON 1 and BARBARA A. BARREIRO 2

1 Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D.C. 20015, and Department of Geological Sciences, University of California, Santa Barbara 93106
2 Department of Geological Sciences, University of California, Santa Barbara

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.

Submitted on January 29, 1980
Revised on May 7, 1980


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