Observaciones geochronologicas sobre los complejos cristalinos de Sonora y Oaxaca, Mexico

Abstract

Reconnaissance geologic mapping and careful study of lead-uranium isotope relationships in zircons from crystalline rocks have resulted in the identification of Precambrian basement from the Mexico-U. S. border, southeast to the known localities near Caborca and from there to Rt. 15 north of Hermosillo. Recent studies have corroborated the presence of Precambrian in Oaxaca. No Precambrian has been identified between Sonora and Oaxaca, but almost no work has been done in these intervening areas.

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