Abstract

Three metallogenetic belts are distinguished, each related to a major geosynclinal orogenic-magmatic belt--an easterly Precambrian belt, a central belt of Hercynian deformation and mineralization, and a western Laramide belt. Late Tertiary deposits are scattered without regard to these earlier mobile belts. Quaternary volcanism along the Andean crest gave rise to sulfur and borate deposits.

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