The Santa Catarina Plateau and the nature of its basement

Jeck, Izabel King; Alberoni, Ana Angélica Ligiéro; Torres, Luiz C. B.; Zalán, Pedro Víctor

doi:10.1007/s00367-019-00585-z

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…in the slope and basin (Abreu, 1998;Barboza et al, 2008). Important basement structures that shaped this margin include the Torres High and the Mostardas Low (Figure 1b;Fontana, 1996;Jeck et al, 2019). The Torres High resulted in a shallow and wide shelf near the northern edge of the Pelotas Basin while the Mostardas Low formed a deep and narrow shelf near the center of the basin (Figure 1b; Cassel et al, 2022;Jeck et al, 2019).…”

Section: Oceanographic Contextmentioning

confidence: 99%

Neogene evolution of the margin adjacent to the La Plata River Delta (Pelotas Basin): Sedimentary pathways and the origins of the Rio Grande Cone

Tagliaro,

Britzke,

Gama

et al. 2024

Basin Research

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Continental margins that exhibit high terrigenous input are generally located near deltas that are capable of transporting large quantities of sediments into the basin. However, in rare cases, high terrigenous sedimentation occurs in regions deprived of major riverine systems where the sedimentary pathway is enigmatic. One such case is the Neogene of the Pelotas Basin of Brazil and Uruguay, adjacent to the La Plata River mouth. Since the Miocene, anomalous sedimentation formed a giant progradational wedge, the Rio Grande Cone, one of the largest submarine fan‐like features on Earth. To understand the Neogene evolution of the margin and the origins of the Rio Grande Cone, here we present a seismic‐stratigraphic framework based on well‐logs and 2D seismic data. Three depositional environments are identified: (1) on the shelf, upper Miocene to Pliocene fluvial channels delivered sand deposits on the mud‐dominated shelf; (2) on the slope, sediment instability resulted in structural deformation and multiple phases of mass transport deposition and (3) on the lower slope and basin floor, large contourite drifts formed by sediment reworking. We classify the Rio Grande Cone as a megaslide complex, due to its depositional and structural setting. Local deltaic systems were active on the shelf in the Neogene, but the limited size of their paleo‐drainage systems in comparison to the volume of sedimentation in the margin suggests that an additional sedimentary pathway existed. In this sense, the demise of an epicontinental sea over the La Plata Basin during the Neogene likely enabled the input of large volumes of fine sediments into the margin, via the La Plata plume water. We suggest that the desiccation of this epicontinental sea and the intensification of ocean currents since the middle Miocene explains the anomalous Neogene terrigenous influx into the SW Atlantic margin.

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Section: Oceanographic Contextmentioning

confidence: 99%

Neogene evolution of the margin adjacent to the La Plata River Delta (Pelotas Basin): Sedimentary pathways and the origins of the Rio Grande Cone

Tagliaro,

Britzke,

Gama

et al. 2024

Basin Research

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“…Nesta bacia, cozinhas locais também se desenvolvem por baixo dos edifícios vulcânicos (vide próximo ao número 5). Segundo JECK et al (2020) o Alto de Torres consiste em um promontório de crosta continental espessa e resistente que se lança desde o continente (a noroeste) mar adentro (a sudeste), muito além do limite crustal continental/oceânico regional de orientação sudoeste-nordeste, paralelo ao litoral. Sua raiz crustal é profunda e sua natureza continental implica em uma flutuação isostática que o transforma em um portentoso alto estrutural.…”

Section: Bacia De Pelotasunclassified

Potencial petrolífero remanescente do Brasil - Estado da arte 2023

Zalán¹

2023

Derb.

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O petróleo ainda será a principal fonte de energia da humanidade por, no mínimo, 50 anos. O Brasil já é e certamente será um provedor ainda mais importante desta matéria prima durante décadas. Há muitas bacias com grande potencial ainda intactas e muitas áreas ainda não exploradas e outras que já possuem reservas e produção. O objetivo deste trabalho é fazer previsões sobre o potencial petrolífero remanescente das bacias sedimentares do Brasil. As previsões são feitas com base no enorme acervo de dados acumulado nos 83 anos de história da exploração petrolífera brasileira, com base nos conceitos mais atualizados da ciência da geologia do petróleo, e, principalmente, com base em minha experiência de 45 anos de atividade no ramo. Nossa previsão final, para o potencial remanescente de petróleo (potencial de recursos prospectivos, identificados ou não, mas ainda não descobertos) de todas as bacias brasileiras fica na faixa de 50-100 bilhões de barris de óleo equivalente recuperável (boer). As bacias que mais deverão contribuir para a realização deste potencial serão Santos/Campos, Pará-Maranhão/Foz do Amazonas/Barreirinhas, Pelotas e Paraná. Em menor escala, mas ainda importantes, Sergipe-Alagoas, Espírito Santo, Camamu-Almada, Solimões e Parnaíba. Temos plena consciência de que a Geologia é uma ciência complexa e surpreendente. Dados novos, tecnologias inovadoras e conceitos criativos nunca dantes imaginados poderão facilmente destruir (para melhor ou para pior) tais previsões.

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“…Paleobathymetric reconstructions suggest that the deepest part of the Pelotas basin was already at 1,000 m water-depth during the Aptian and might have reached up to 4,000 m water-depth during the latest Cretaceous (Pérez-Diaz & Eagles, 2017). (Jeck et al, 2020). Tectonic arches from Justus et al (1986), Soto et al (2011) and references therein.…”

Section: Case Study: the Pelotas Basinmentioning

confidence: 99%

“…The main depocenter of the Pelotas basin corresponds to the Rio Grande Cone (RGC). The main present‐day drift systems are illustrated: Chui, Rio Grande, Pelotas and Santa Catarina Drifts (Jeck et al., 2020). Tectonic arches from Justus et al.…”

Section: Case Study: the Pelotas Basinmentioning

confidence: 99%

High‐resolution sedimentary budget quantification – Example from the Cenozoic deposits in the Pelotas Basin, South Atlantic

Rohais

Lovecchio²,

Abreu³

et al. 2021

Basin Research

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In this paper, we propose a high-resolution (HR) sedimentary budget quantification at basin-scale for the Cenozoic deposits of the Pelotas Basin (South Atlantic). A new workflow is implemented including five main steps: (1) basin-scale analysis and characterization, (2) quality control and selection of reference 2D dip-sections,(3) HR seismic stratigraphy analysis, (4) sediment supply estimation taking into account lithology and porosity corrections and then (5) the estimation of the sedimentary budget curve including 41 time-intervals for the last 65 Myr. Variance ranges were determined considering the parameters of the method on the case study. The main uncertainties are related to the seismic velocities for the time-to-depth conversion (5%-22%), the method for lithological parameters quantification and associated porosity correction (4.4%-14.3%), the absolute ages of stratigraphic markers (1%-25%), and the proportion of in-situ sediment production (0.3%-0.5%). For the very first time, this method allows the identification of several cycles from an entire sedimentary basin fill characterized by pulses of sediment supply (Qs) whose growth phase lasts less than 1 Myr, followed by a constant phase lasting 1-2 Myr, and finally an exponentially decreasing phase lasting 2-5 Myr. These pulses alternate with phases where the sediment supply was very low for intervals of ca. 1-5 Myr. Ten major pulses were recognized during the Cenozoic. We propose that the sediment supply dynamic in the Pelotas basin records the orogenic phases of the Andes located more than 2,000 km upstream. The recorded Qs pulses in the basin are out of phase with respect to the active tectonic phases of the Central Andes. Finally, by comparing the volume of preserved sediment and the production capacity of the catchment, we suggest that a source of sediment in addition to the Brazilian craton and the Andes should be envisaged, potentially associated with deep-water oceanic circulation.

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The Santa Catarina Plateau and the nature of its basement

Cited by 6 publications

References 3 publications

Neogene evolution of the margin adjacent to the La Plata River Delta (Pelotas Basin): Sedimentary pathways and the origins of the Rio Grande Cone

Neogene evolution of the margin adjacent to the La Plata River Delta (Pelotas Basin): Sedimentary pathways and the origins of the Rio Grande Cone

Potencial petrolífero remanescente do Brasil - Estado da arte 2023

High‐resolution sedimentary budget quantification – Example from the Cenozoic deposits in the Pelotas Basin, South Atlantic

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