Inherited basement structures and their influence in foreland evolution: A case study in Central Patagonia, Argentina

Abstract

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Paleomagnetic evidence of the brittle deformation of the Central Patagonian Batholith at Gastre area (Chubut Province, Argentina)

“…Then, a tectonic event could have affected the batholith and produce the tilting of the block, during the Jurassic extensional period (Figari, 2005) and, or, during a compressional stage, during the Late Cretaceous or later, related to the Andean Orogeny (Bilmes et al, 2013(Bilmes et al, , 2014Savignano et al, 2016;Zaffarana et al, 2018b). The main fractures in the Gastre area show a NW-SE direction and could have been originated during the formation of the Cañadón Asfalto Basin (Figari, 2005), where they acted as normal faults (part of half grabens), probably developed aided by the previous Paleozoic structures (Renda et al, 2019). This set of semi-parallel fractures are also proposed to have acted as reverse faults during the Late Cretaceous and, or, Miocene, triggered by the Andean Orogeny, during the formation of the Gastre Basin (Bilmes et al, 2013(Bilmes et al, , 2014Savignano et al, 2016).…”

“…The patron of the magmatic as well as the solid-state foliations of the granites are subparallel, defining a trend of NW-SE subvertical structures. Within the North Patagonian Massif, there are NW-SE trending subvertical structures which would constitute its structural grain, inherited from the pervasive Late Paleozoic deformation (Álvarez et al, 2014;Giacosa et al, 2004Giacosa et al, , 2014Renda et al, 2019;von Gosen et al, 2002;Gosen, 2009;von Gosen and Loske, 2004).…”

Los mármoles cálcicos de El Escorial (Complejo Metamórfico Cushamen, Macizo Norpatagónico): caracterización isotópica de 87Sr-86Sr y edad de sedimentación

“…Por el momento y en base a la información disponible, en este trabajo sostenemos la hipótesis de que las unidades del noreste del MNP no serían correlacionables con las unidades de la zona centro-sur (Unidad El Escorial), en concordancia con las propuestas de otros autores (Giacosa et al, 2014;Hervé et al, 2018;Renda et al, 2019Renda et al, , 2021Rapela y Pankhurst, 2020;Rapela et al, 2021).…”

Basement control, sedimentary basin inception and early evolution of the Mesozoic basins in the Patagonian foreland

“…The interaction among the mantle convection, the lithosphere rheology, and the structural weaknesses of the late Paleozoic basement controlled the Pangea evolution and its final breakup, which includes the development of numerous extensional Mesozoic basins located in the southwestern Gondwana margin (Franzese et al, 2003). These weakness zones constituted the location of both intracontinental extensional and transtensional deformation belts with an NNW, NW and WNW orientation, which characterize the initiation and development of the Triassic and Jurassic rifts (Vizán et al, 2017;Renda et al, 2019).…”

“…First, basement outcrops are of small scale, isolated and except rocks in the eastern sector of the North Patagonian Massif (Greco et al, 2015;González et al, 2018), they lack detailed structural studies. Some preliminary studies include rocks in the Bariloche and Pilcaniyeu region (Giacosa and Heredia, 2004;García-Sansegundo et al, 2008), Gastre region (Von Gosen, 2009;Giacosa et al, 2017), Taquetren and Pichiñanes ranges (Allard, 2015;Renda et al, 2019) and La Rueda (Giacosa et al, 2008). Second, the available 3D seismic sections lack the appropriate resolution at basement levels.…”