K-Ar geochronology of basement rocks on the northern flank of the Huancabama deflection, Ecuador

Resumen

The Huancabamba Defleotion, a major Andean orecline located at the Ecuador-Peru border, constitutes an important geologic boundary on the Pacific coast of South America, Crust to the north of the deflection is oceanic and the basement is composed of basic igneous rocks of Cretaceous age, whereas crust to the south is con-