Basement reactivation and structural inheritance in the Jurassic to Neogene evolution of the North Patagonian Andes (Argentina).

• Autores: Peltzer, Sofía; Yoya, María Belén; Olaizola, Ezequiel; Bechis, Florencia; Yagupsky, Daniel; González, Pablo Diego; Stipp Basei, Miguel Angelo; Oriolo, Sebastián
• Año de publicación: 2024
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias de la Tierra (General); Patagonian basement; North Patagonian batholith; Jurassic transtension; Neogene transpression; Ciencias de la Tierra (General)
• Institución: Universidad Nacional de Río Negro

Fil: Peltzer, Sofía. Universidad de Buenos Aires, Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Intendente Güiralde s 2160, C1428EHA, Buenos Aires, Argentina
Fil: Yoya, María Belén. Universidad de Buenos Aires, Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Intendente Güiralde s 2160, C1428EHA, Buenos Aires, Argentina
Fil: Olaizola, Ezequiel. Universidad Nacional de Río Negro, Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio, Bartolomé Mitre 630, R8400AHN, San Carlos de Bariloche, Argentina
Fil: Bechis, Florencia. Universidad Nacional de Río Negro, Instituto de Investigaciones en Diversidad Cultural y Procesos de Cambio, Bartolomé Mitre 630, R8400AHN, San Carlos de Bariloche, Argentina
Fil: Yagupsky, Daniel. Universidad de Buenos Aires, Instituto de Estudios Andinos (IDEAN), Intendente Güiraldes 2160, C1428EHA, Buenos Aires, Argentina
Fil: González, Pablo Diego. CONICET-SEGEMAR, Regional Sur, Independencia, 1495, Parque Industrial 1, R8332EXZ, General Roca, Argentina
Fil: Stipp Basei, Miguel Angelo. Universidade de São Paulo, Centro de Pesquisas Geocronologicas, Instituto de Geociências, Ru a do Lago 562, CEP 0550 8 -080, São Paulo, Brazil
Fil: Oriolo, Sebastián. Universidad de Buenos Aires, Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Intendente Güiralde s 2160, C1428EHA, Buenos Aires, Argentina
Structural inheritance is a major control on the Andean structural architecture and magma emplacement, particularly in Patagonia, where the genesis of sedimentary basins and magmatic arcs has been largely influenced by basement fabrics. Based on new geologic, structural, microstructural and geochronologic data, the aim of this contribution is to evaluate the influence of pre-existing mechanical anisotropies of the Paleozoic basement on the Jurassic-Neogene tectonic evolution in the Paso de las Nubes area (North Patagonian Andes, Argentina). U-Pb zircon data of an orthogneiss yielded an age of 166 ± 2 Ma, which is consistent with the Jurassic batholith reported in the North Patagonian Andes, being thus coeval with retrograde metamorphism and deformation in the metasedimentary wallrock. Fault kinematic data indicate a Jurassic transtensional regime, strongly controlled by basement reactivation. On the other hand, a second kinematic population records a mainly strike-slip solution, associated with partitioned Neogene transpression.
Structural inheritance is a major control on the Andean structural architecture and magma emplacement, particularly in Patagonia, where the genesis of sedimentary basins and magmatic arcs has been largely influenced by basement fabrics. Based on new geologic, structural, microstructural and geochronologic data, the aim of this contribution is to evaluate the influence of pre-existing mechanical anisotropies of the Paleozoic basement on the Jurassic-Neogene tectonic evolution in the Paso de las Nubes area (North Patagonian Andes, Argentina). U-Pb zircon data of an orthogneiss yielded an age of 166 ± 2 Ma, which is consistent with the Jurassic batholith reported in the North Patagonian Andes, being thus coeval with retrograde metamorphism and deformation in the metasedimentary wallrock. Fault kinematic data indicate a Jurassic transtensional regime, strongly controlled by basement reactivation. On the other hand, a second kinematic population records a mainly strike-slip solution, associated with partitioned Neogene transpression.