Sedimentological, geochemical and paleontological insights applied to continental omission surfaces: A new approach for reconstructing an eocene foreland basin in NW Argentina

Papa, Cecilia del; Kirschbaum, Alicia; Powell, Jaime Eduardo; Brod, A.; Hongn, Fernando; Pimentel, Márcio Martins

doi:10.1016/j.jsames.2009.06.004

Cited by 79 publications

(34 citation statements)

References 56 publications

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“…A foreland basin developed over the post-rift basin in a paraconcordant stratigraphic relationship. A hiatus in the stratigraphic sequence has been reported (Reynolds et al, 2000;Del Papa et al, 2010). The subsidence mechanisms changed in the foreland basin stage.…”

Section: Discussionmentioning

confidence: 88%

“…The transition from post-rift to foreland settings occurred as the Andean deformation started to propagate towards the east (Carrera et al, 2006;Jordan and Alonso, 1987;Russo and Serraiotto, 1979). The foreland basin stage can be recognized by the presence of an angular unconformity and a stratigraphic gap of the middle Eocene (Del Papa et al, 2010;Reynolds et al, 2000). Paleogene sandstones and shales of the Aconquija formation crop out along the eastern margin of the Sierra de Aconquija (González Bonorino, 1950) (Figs.…”

Section: Stratigraphymentioning

confidence: 99%

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Tectonic inversion in a segmented foreland basin from extensional to piggy back settings: The Tucumán basin in NW Argentina

Iaffa

Sàbat

Bello

et al. 2011

Journal of South American Earth Sciences

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Section: Discussionmentioning

confidence: 88%

Section: Stratigraphymentioning

confidence: 99%

Tectonic inversion in a segmented foreland basin from extensional to piggy back settings: The Tucumán basin in NW Argentina

Iaffa

Sàbat

Bello

et al. 2011

Journal of South American Earth Sciences

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“…As the thermal subsidence ceased, the Andean orogeny was approaching the area, generating positive topography to the west, along with sediment supply to the subsiding formed trough. This transition can be recognized by the presence of an angular unconformity and stratigraphic gap of the Eocene (Reynolds et al 2000;Del Papa et al 2009). The newly formed topography and its associated denudation deposits reached out and covered the study area (Russo & Serraiotto 1979;Jordan & Alonso 1987).…”

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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“…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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Sedimentological, geochemical and paleontological insights applied to continental omission surfaces: A new approach for reconstructing an eocene foreland basin in NW Argentina

Cited by 79 publications

References 56 publications

Tectonic inversion in a segmented foreland basin from extensional to piggy back settings: The Tucumán basin in NW Argentina

Tectonic inversion in a segmented foreland basin from extensional to piggy back settings: The Tucumán basin in NW 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

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