Tectonic and Sedimentary Evolution of the Cretaceous-Eocene Salta Group Basin, Argentina

Salfity, José A.; Marquillas, Rosa A.

doi:10.1007/978-3-322-85472-8_6

Cited by 123 publications

(173 citation statements)

References 15 publications

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“…Post-rift deposits were formed during the thermal cooling phase of the rifting, when the extensional faulting ceased and the subsidence mechanisms changed (Bianucci et al 1981;Salfity & Marquillas 1994). During this stage, thin sediments were deposited in layers onlapping the previous synrift beds and the basement (Comínguez & Ramos 1995;Rodríguez Fernández et al 1999;Kley & Monaldi 2002;Carrera et al 2006).…”

Section: Stratigraphymentioning

confidence: 99%

Basin fragmentation controlled by tectonic inversion and basement uplift in Sierras Pampeanas and Santa Bárbara System, northwest Argentina

Iaffa

Sàbat

Muñoz

et al. 2013

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The study area is located within the Central Andes, a complex region composed of different structural styles. The region is characterized by highly elevated basement cored ranges, which abruptly break the foreland plain. These ranges were uplifted mainly by deep detached high-angle faults or by the inversion of former extensional faults of the Cretaceous rift. Palaeozoic orogenies generated crustal scale discontinuities in the basement, some of them reactivated during the Andean orogeny. Sedimentary sequences and layers architecture in the basins bordering ranges recorded the tectonic evolution of the region. Basement, syn–rift, post-rift and three foreland stages were interpreted in the seismic sections according to the arrangement of the horizons and the main outcropping geological units in bordering ranges. Based on seismic data sets and field data, here we document a particular style of activation of basement faults. Thick-skinned structures that are not always related to the tectonic inversion but to the reactivation of older basement anisotropies represent a paradox since they were not active during the rifting stage. A flat slab subduction and a subsequent angle recovery conditioned the structural evolution of the area.

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Section: Stratigraphymentioning

confidence: 99%

Basin fragmentation controlled by tectonic inversion and basement uplift in Sierras Pampeanas and Santa Bárbara System, northwest Argentina

Iaffa

Sàbat

Muñoz

et al. 2013

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“…The specimen described here comes from the uppermost section of the Lower Lumbrera known as "Faja Verde" because of its lacustrine origin. The age constraint of the Faja Verde Lake is not precisely dated, and mostly estimated on the basis of regional considerations, the mammalian fossil record, and an absolute U/Pb zircon date (Salfity & Marquillas, 1994;del Papa et al, 2010); which in conjunction point to a Lower Eocene age. The strongest dating evidence is provided by an U/Pb zircon dating of 39.9 Ma from a tuff bed stratigraphically located 240 m above the fossiliferous level .…”

Section: Introductionmentioning

confidence: 99%

A new genus and species of Heroini (Perciformes: Cichlidae) from the early Eocene of southern South America

2010

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The Lumbrera Formation is the uppermost unit of the Salta Group, which crops out in northwestern Argentina. The paleoenvironment of the Lumbrera Formation is interpreted as a perennial lake deposited under temperate climatic conditions during the early to middle Eocene. Its fossil content is made up of palynomorphs, insects, crocodiles, turtles, lizards, and mammals, besides an ichthyofauna formed by cichlids, poeciliids and dipnoans. †Plesioheros chauliodus is described based on a single individual from this formation, which was fossilized as a lateral view impression (missing anal and caudal fins). It can be distinguished from other cichlids by a moderately deep body, enlarged anterior dentary teeth bearing subapical cusp, a low abdominal vertebral count (10), five canal openings in the dentary, and XI + 12 dorsal-fin rays. A phylogenetic analysis, using the matrix by Kullander (1998), recovered †Plesioheros within Heroini. This species was recovered most closely related to Australoheros and to the deep-bodied South American heroins. The occurrence of an Eocene Heroini, as well as of other cichlid lineages in the same stratigraphical level, is evidence of an ancient diversification in this family. This ancient age supports the hypothesis that the Cichlidae originated on Gondwana.A Formação Lumbrera é a unidade do topo do Grupo Salta, aflorante na região noroeste da Argentina. O paleoambiente da Formação Lumbrera tem sido interpretado como um lago perene depositado sob um clima temperado durante o início do Eoceno. Seu conteúdo fóssil é formado por palinomorfos, insetos, crocodilos, tartarugas, lagartos, mamíferos, além de uma ictiofauna que inclui ciclídeos, poeciliídeos e dipnóicos. †Plesioheros chauliodus é descrito com base em um único indivíduo coletado nesta formação, preservado como impressão em vista lateral (faltando as nadadeiras anal e caudal). Ele pode ser distinguido de outros ciclídeos por um corpo moderadamente alto, dentes anteriores do dentário aumentados e portando uma cúspide lingual subapical, uma baixa contagem de vértebras abdominais, cinco aberturas do canal sensorial no dentário, e XI + 12 raios na dorsal. Na análise filogenética, usando a matriz apresentada por Kullander (1998), †Plesioheros resultou dentro da Tribo Heroini mais relacionado a Australoheros e aos heroinis de corpo alto sul-americanos. A ocorrência de um heroini fóssil desta idade, bem como das outras linhagens de ciclídeos no mesmo nível estratigráfico, é uma evidência da diversificação inicial da família, corroborando fortemente a hipótese de que os Cichlidae se originaram no Gondwana ainda durante o Cretáceo.

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“…Extension to transpression also dominated the tectonics in the Mesozoic magmatic arcs during oblique subduction (e.g., Scheuber et al, 1994). The most prominent surface expression of extension in the study area is the Salta basin (e.g., Salfity et al, 1994;Marquillas et al, 2005) of the 'Salta rift' in northwest Argentina (Fig. 1a Galliski and Viramonte, 1988;Griers et al, 1991) with a maximum of ~ 5 km of continental sedimentation in depocentres from Early Cretaceous until Early Tertiary.…”

Section: Geodynamic Setting and Geological Framework Of The Intra-plamentioning

confidence: 88%

Pre-Cenozoic intra-plate magmatism along the Central Andes (17–34°S): Composition of the mantle at an active margin

Lucassen

Franz

Romer

et al. 2007

Lithos

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Tectonic and Sedimentary Evolution of the Cretaceous-Eocene Salta Group Basin, Argentina

Cited by 123 publications

References 15 publications

Basin fragmentation controlled by tectonic inversion and basement uplift in Sierras Pampeanas and Santa Bárbara System, northwest Argentina

Basin fragmentation controlled by tectonic inversion and basement uplift in Sierras Pampeanas and Santa Bárbara System, northwest Argentina

A new genus and species of Heroini (Perciformes: Cichlidae) from the early Eocene of southern South America

Pre-Cenozoic intra-plate magmatism along the Central Andes (17–34°S): Composition of the mantle at an active margin

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