Abstract
In the western Colombian Andes two domains can be distinguished: a polymetamorphic complex in the Central Cordillera that includes Precambrian to Cretaceous rocks, and a basic basement with marine sediments, both of Cretaceous age, in the Western Cordillera. The two domains are intruded by intermediate to acidic plutons. With the available radiometric datings of these plutons three main magmatic belts of Jurassic-Early Cretaceous, Early Cretaceous-Paleocene, and Cenozoic ages can be postulated. These belts present two types of migration; one, abrupt towards the west, occurs at the beginning of a new belt; the other, progressive towards the east, occurs within each magmatic belt.
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