Protolith age of the Altar and Carnero complexes and latest Cretaceous–Miocene deformation in the Caborca–Altar region of northwestern Sonora, Mexico

Abstract

The Altar and Carnero complexes and deformation in northwestern Sonora, Mexico RMCG | v. 36 | núm. 1 | www.rmcg.unam.mx | DOI: http://dx.

Oligocene‐Miocene Exhumation of the Pinaleño Metamorphic Core Complex, Southeastern Arizona: Support for Magmatism and Plate Margin Reorganization as Controls on Regional Exhumation Trends

“…The orange line is a moving average (period = 50) of magmatic dates compiled from EarthChem. The start and end of rapid cooling for metamorphic core complexes is reported inFoster and Spencer (1992),John and Foster (1993),Fitzgerald et al (1993),Miranda-Gasca et al (1998),Pease et al (1999),Granillo and Calmus (2003),Haines and van der Pluijm (2008),Carter et al (2004),Wong and Gans (2008),Wong et al (2010),Singleton et al (2014Singleton et al ( , 2019,Prior et al (2016), LaForge et al (2017,Jacobson et al (2019),Gottardi et al (2020), andJepson et al (2022). (b) Schematic plate reconstructions showing the subduction of the Pacific-Farallon spreading ridge, the initiation of the MTJ and RTJ, the development of the dextral-transform Pacific-North American plate boundary, and the San Andreas Fault system (SAFS).…”

“…Recent data compilations show that extension and exhumation are diachronous across the Cordillera and generally become younger from the northern to central core complex belt and becomes younger from south to north in the southern belt (Chapman et al., 2021; Howlett et al., 2021; Konstantinou & Miller, 2015; Zuza & Cao, 2023). The spatiotemporal trend in the southern belt appears to reverse in southeast Arizona, U.S., where core complex exhumation is older than is recorded in Sonora, Mexico (Granillo & Calmus, 2003; Haines & van der Pluijm, 2008; Jacobson et al., 2019; Miranda‐Gasca et al., 1998; Nourse et al., 1994; Wong & Gans, 2008; Wong et al., 2010) (Figure 2).…”

Mapa geológico y base de datos geocronológicos de Sonora, México

“…En el centro y sur de Sonora aflora el grupo Lampazos (Kl) que es equivalente lateral de Kb, pero de facies de cuenca marina más profunda; en Kl se incluyen afloramientos indiferenciados de esa edad, del sur de Sonora. A inicios del Cretácico Tardío empezó la fase de acortamiento tectónico Laramide (Valencia-Moreno y Ortega-Rivera, 2011; Calmus et al, 2011) que acumuló los depósitos sintectónicos de la Formación Cocóspera (Kfc), del Complejo Altar (Jacobson et al, 2019) y el Grupo Cabullona (Ks), y simultáneamente empezó la actividad magmática del arco Laramide. Las rocas volcánicas de éste, que se asignan a la Formación Tarahumara (Ks-Tv), tienen edades de cristalización entre ca.…”