Basement reactivation and structural inheritance in the Jurassic to Neogene evolution of the North Patagonian Andes (41° 08’ – 41° 11’ S), 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 geochron...

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Bibliographic Details
Published in:Journal of South American earth sciences 2024-11, Vol.148, p.105170, Article 105170
Main Authors: Peltzer, Sofía, Yoya, María Belén, Olaizola, Ezequiel, Bechis, Florencia, Yagupsky, Daniel, González, Pablo D., Basei, Miguel A.S., Oriolo, Sebastián
Format: Article
Language:English
Subjects:
Jurassic transtension
Neogene transpression
North Patagonian batholith
Patagonian basement
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Summary: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 key process in the North Patagonian Andes evolution.•Jurassic and Neogene deformation was controlled by basement reactivation.•U-Pb zircon data and microstructues in orthogneiss indicate Jurassic subvolcanic magmatism.•Jurassic magmatism was emplaced during transtensional deformation.•Neogene strike-slip faults associated with partitioned dextral transpression.
ISSN:0895-9811
DOI:10.1016/j.jsames.2024.105170