U-Pb and 40Ar/39Ar geochronology of the coastal Sonora batholith: New insights on Laramide continental arc magmatism

Ernesto Ramos-Velázquez (1, 2) , Thierry Calmus (1) , Victor Valencia (3) , Alexander Iriondo (4, 5) , Martín Valencia-Moreno (1) , Hervé Bellon (6)

1 Estacion Regional del Noroeste
2 Departamento de Geologia
3 Department of Geosciences [University of Arizona]
4 Centro de Geociencias [Queretaro]
5 Department of Geological Sciences [Boulder]
6 LDO - Domaines Océaniques

The coastal Sonora batholith comprises a series of Cretaceous granitoids that intruded a metasedimentary basement of possible n the basis of new and available geochronologic, petrographic, and geochemical data, we propose that the Coastal Sonora batholith and the eastern portion of the Peninsular Ranges batholith belong to a single magmatic arc, which was separated during the continental breakup and rifting of the Gulf of California in the Tertiary.

Mots clés: U-Pb; 40Ar/39Ar; Cretaceous-Tertiary magmatic arc; Laramide; Coastal Sonora batholith; Mexico

Domaines: Pétrographie

Ernesto Ramos-Velázquez, Thierry Calmus, Victor Valencia, Alexander Iriondo, Martín Valencia-Moreno, et al.. U-Pb and 40Ar/39Ar geochronology of the coastal Sonora batholith: New insights on Laramide continental arc magmatism. Revista Mexicana de Ciencias Geológicas, 2008, 25 (2), pp.314-333. ⟨insu-00315592⟩