Geochronological control for the main tectonic-magmatic events of Ecuador

Abstract:

A chronological outline of the principal tectonic-magmatic events of Ecuador is presented, based upon approximately 100 K/Ar and Rb/Sr age determinations. Eight magmatic episodes are recognized. In southwestern Ecuador evidence of plutonic and metamorphic activity in the Late Precambrian and in the Middle to Late Triassic is found. Large granitic batholiths of Middle to Late Jurassic age, associated with widespread acidic volcanism, are traceable along the eastern flank of the Andes into Colombia. Early Cretaceous volcanism and plutonism is recognized only in southern Ecuador, although apparently equivalent units continue southwards into the Coastal Cordillera of Peru. A great orogenic belt, characterized by metamorphism, plutonism, and volcanism, was established in the Late Cretaceous and continued through the Paleogene. It is traceable into Peru and Colombia. The Macuchi Fm. of the Western …

Año de publicación:

1982

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