Estratigrafia E Evolução Da Barreira Holocênica Do Rio Grande Do Sul No Trecho Tramandaí-Cidreira

Travessas, Felipe de Almeida; Dillenburg, Sérgio Rebello; Clerot, Luiz Carlos Pinheiro

doi:10.5380/geo.v57i0.6043

Cited by 26 publications

(29 citation statements)

References 6 publications

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“…The radiocarbon ages mentioned in this paper are related to the evolution of System IV, resulting from the works of Tomazelli et al (1998Tomazelli et al ( , 2008, Dillenburg et al (2004Dillenburg et al ( , 2006Dillenburg et al ( , 2007, Travessas et al (2005), and Silva (2011). The samples were collected in standard penetrating test (SPT) cores and outcrops, and analyzed by Beta Analytic Inc., corresponding to six mollusk shell samples, one piece of wood, one sample of root and one sample of organic sediment (Table 1).…”

Section: Methodsmentioning

confidence: 99%

“…In these sectors, lagoonal mud and peat outcrop in the current beach face (Tomazelli et al 1998;Dillenburg et al 2004). 14 C dating of these deposits indicate ages of 6,843-6,303 cal yr BP (Travessas et al 2005), 4,252-4,641 cal yr BP (Tomazelli et al 1998) and 3,551-2,888 cal yr BP (Dillenburg et al 2004), which imply that the barrier was positioned seaward of its present position.…”

Section: System IVmentioning

confidence: 99%

“…More recently, high-resolution seismic and Ground Penetrating Radar (GPR) enabled a more continuous view of the depositional architecture and provided key-observations to further the understanding of the evolution of these systems (Weschenfelder et al 2005(Weschenfelder et al , 2014Barboza et al 2009Barboza et al , 2013Silva 2011Silva , 2015Silva et al 2010Silva et al , 2014Fracalossi et al 2010;Rosa 2012;Lima et al 2013;Leal et al 2016;Oliveira et al 2016). , 7.7 to 4.3 ka ), 6.6 ka (Travessas et al 2005), 4.4 ka (Tomazelli et al 1998), 3.2 ka (Dillenburg et al 2004), 4.4 to 1.1 ka (Martinho et al 2008) 8 to 0 ka 3 m 1 85 ka with a 30% precision (Poupeau et al 1988 . The onshore record of each system was associated by Villwock and Tomazelli (1995) to high sea levels, related to oxygen isotope stages from Imbrie et al (1984).…”

Section: High-frequency Sedimentary Record: Barrier-lagoon Systemsmentioning

confidence: 99%

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High-Frequency Sequences in the Quaternary of Pelotas Basin (coastal plain): a record of degradational stacking as a function of longer-term base-level fall

Rosa

Barboza

Abreu³

et al. 2017

Braz. J. Geol.

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ABSTRACT:The aim of this work was to analyze the sedimentary record of the coastal plain of Pelotas Basin, placing it in the context of temporal and spatial scales, and proposing a stratigraphic hierarchical framework. The coastal plain, located in southern Brazil and in northern Uruguay, is mainly formed by four Quaternary barrier-lagoon systems. Three of these systems were studied through the integration of surface and subsurface data (geomorphological and topographical mapping, outcrops description, geoprocessing, dating and Ground Penetrating Radar -GPR -records) and interpreted as the preserved, onshore portion of depositional sequences mainly controlled by glacioeustatic cycles of about 100 kyr. The stacking pattern comprising these sequences is progradational with seaward downsteping (highest sea-levels measured: 9.5, 8 and 3 m, respectively), comprehending a degradational sequence set, or the regressive/ falling stage systems tract of a higher order depositional sequence identified in seismic sections, with about 0.5 Ma. The youngest sequence has diachronous systems tracts -while some sectors have already transitioned from the transgressive to the highstand/falling stage systems tract, others are still under a transgressive context. It indicates that, in this time and scale, the sea level is not the main control of coastal evolution, and autogenic factors are fundamental in the run of geological record. KEYWORDS:Barrier-Lagoon; Glacioeustasy; Diachronism of Systems Tracts; Ground Penetrating Radar; Rio Grande do Sul coastal evolution. RESUMO:

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Section: Methodsmentioning

confidence: 99%

Section: System IVmentioning

confidence: 99%

Section: High-frequency Sedimentary Record: Barrier-lagoon Systemsmentioning

confidence: 99%

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High-Frequency Sequences in the Quaternary of Pelotas Basin (coastal plain): a record of degradational stacking as a function of longer-term base-level fall

Rosa

Barboza

Abreu³

et al. 2017

Braz. J. Geol.

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“…Apesar de não haver um nível de significância estatís-tica entre as batidas e a profundidade atingida pelas sondagens (r = 0,20 e R²=0,04), foi observado aumento progressivo da resistência à penetração conforme foram atingidas maiores profundidades. Resultados similares para a PCRS foram descritos por Travessas et al (2005), em que depósitos eóli-cos foram moderadamente compactados enquanto os depósitos de margem lagunar foram de moderadamente a muito compactados e depósitos praiais oceânicos são altamente compactados.…”

Section: Arquitetura Deposicionalunclassified

“…Neste mesmo intervalo de tempo, a barreira holocênica, na região de Curumim, igualmente desenvolvia sua fase de agradação acompanhada por um início da progradação (Dillenburg et al, 2006. Na PCRS, datações com idades similares em altitudes concomitantes, em lagunas e lagoas foram obtidas por Dillenburg (1994) e Travessas et al (2005), por exemplo. A partir da datação das fácies sotopostas aos cordões, é possível supor que a formação e o desenvolvimento dos cordões regressivos ocorreram após o clímax do NRM do Holoceno.…”

Section: Arquitetura Deposicionalunclassified

Geomorfologia e arquitetura deposicional de uma planície de cordões litorâneos na margem NE da Lagoa dos Quadros, RS, Brasil

et al. 2016

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Resumo-Cordões litorâneos regressivos do tipo dunas frontais (foredune ridges) e do tipo praia (beach ridges) são elementos morfológicos muito comuns em margens de lagoas e lagunas costeiras, embora ainda pouco estudados. Neste trabalho, são apresentados resultados do estudo de uma planície de cordões litorâneos regressivos arenosos que se formou na margem NE da Lagoa dos Quadros, no litoral norte do Rio Grande do Sul. A partir da análise de fotografias aéreas, levantamentos altimétricos, perfis de georadar (GPR), testemunhos de sondagem e amostras superficiais, foram investigadas a morfologia da planície de cordões e o arcabouço estratigráfico de seus respectivos depósitos sedimentares. A planície é composta por 20 cordões contínuos e semi-contínuos, de baixa amplitude e espaçados de 5 a 50 m. Sobre uma fácies basal de fundo lagunar que se formou aproximadamente entre 7 e 6 ka, desenvolveu-se uma sequência regressiva de modo agradacional e progradacional composta por depósitos de antepraia, de pós-praia/face de praia, dunas frontais e depósitos de leque de sobrelavagem. Dunas transgressivas adentrando na lagoa a partir da barreira holocênica IV (barreira de Curumim) podem ter sido uma importante fonte de areia para o desenvolvimento da planície de cordões. Palavras-chave: GPR, cordão de praia, cordão de duna frontal, sequência regressiva, barreira complexa, lagoa costeira.Abstract-Geomorphology and depositional architecture of a strandplain at the ne margin of Quadros Lagoon, RS, Brazil. Foredune ridges and beach ridges are morphological elements largely present in coastal lakes and coastal lagoons. However, it still requires further studies. This paper presents results of a prograding strandplain (sand ridge plain) developed at the NE margin of Quadros Lagoon, in the northern littoral of Rio Grande do Sul. Aerial photographs analysis, topographic surveying, GPR records, soundings and surface samples allowed to study the morphology of the strandplain and the stratigraphic framework of their respective sedimentary deposits. The strandplain comprises 20 continuous and semi-continuous ridges, of low amplitude and spaced 5 to 50 m. A regressive sequence comprising deposits of shoreface, backshore/beachface, foredunes and washover fans was developed aggradacionaly and proggradacionaly over a basal facies of a lagoon bottom, between the last 7 to 6 ky. Transgressive dunefields from the Holocene barrier IV (Curumim barrier) to Quadros Lagoon was probably an important source of sand for the strandplain development.

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Radon activity and submarine groundwater discharge in different geological regions of a coastal barrier in Southern Brazil

2018

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Estratigrafia E Evolução Da Barreira Holocênica Do Rio Grande Do Sul No Trecho Tramandaí-Cidreira

Cited by 26 publications

References 6 publications

High-Frequency Sequences in the Quaternary of Pelotas Basin (coastal plain): a record of degradational stacking as a function of longer-term base-level fall

High-Frequency Sequences in the Quaternary of Pelotas Basin (coastal plain): a record of degradational stacking as a function of longer-term base-level fall

Geomorfologia e arquitetura deposicional de uma planície de cordões litorâneos na margem NE da Lagoa dos Quadros, RS, Brasil

Radon activity and submarine groundwater discharge in different geological regions of a coastal barrier in Southern Brazil

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