Abstract

Detailed Pb isotopic maps of the central Andes, based on 345 (163 previously published, 182 new) analyses of ores, volcanic rocks, and their host rocks, elucidate the gross structure of the basement and reveal that several isotopically distinct basement domains are juxtaposed in this region. The data clearly show that most of the Pb in central Andean igneous and ore samples is derived from the local basement, including Pb in ore deposits of the Bolivian tin belt. Some of the isotopic domain boundaries correspond to geologic structures and the residual gravity pattern, as well as to metallogenic boundaries such as the western edge of the Bolivian tin belt.

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