Quaternary sea-level changes and aeolianites in the Fernando de Noronha archipelago, northeastern Brazil

Ângulo, Rodolfo José; Souza, Marilei de Melo Tavares e; Fernandes, Luiz Alberto; Disaró, Sibelle Trevisan

doi:10.1016/j.quaint.2012.12.029

Cited by 24 publications

(14 citation statements)

References 15 publications

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“…The timing and elevation of this SLH is largely consistent across the Brazilian coast and is well matched to hydroisostatic predictions (Isla, 1989;Peltier, 1998;Milne et al, 2005). Regional differences are attributed to proximity to the equator, variability in geoidal relief Suguío et al, 1985;Angulo et al, 2006), tectonics along regional faults (Bezerra et al, 2003;Rossetti et al, 2008;Castro et al, 2010), or local subsidence (Rossetti, 2003;Souza-Filho et al, 2009;Angulo et al, 2012). Following the highstand, rSL fell relatively smoothly, or with gentle oscillations, to modern elevations in the last <1000 years (Angulo et al, 2006).…”

Section: Regional Variability In Southern Hemisphere Sea-level Changesupporting

confidence: 69%

Coastal response to late-stage transgression and sea-level highstand

Hein¹,

FitzGerald²,

Menezes³

et al. 2014

Geological Society of America Bulletin

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Coastal morphologic features associated with past shoreline transgressions and sealevel highstands can provide insight into the rates and processes associated with coastal response to the modern global rise in sea level. Along the eastern and southern Brazilian coasts of South America, 6000 years of sea-level fall have preserved late-stage transgressive and sea-level highstand features 1-4 m above present mean sea level and several kilome ters landward of modern shorelines. GPS with real-time kinematics data, ground-penetrating radar, stratigraphy, and radiocarbon dating within a 2-3-km-wide river-associated strandplain in central Santa Catarina (southern Brazil) uncovered a diverse set of late-stage transgressive and highstand deposits. Here, the highstand took the forms of (1) an exposed bedrock coast in areas of high wave energy and low sediment supply;(2) a 3.8-m-high transgressive barrier ridge where landward barrier migration was prohibited by the presence of shallow bedrock; and (3) a complete barrier-island complex containing a 5.2-m-high barrier ridge, washover deposits, a paleo-inlet, and a backbarrier lowland, formed in a protected cove with ample sediment supply from small local streams and the erosion of upland sediments. Similar signatures of the mid-Holocene highstand can be traced across all coastal Brazilian states. This study presents the fi rst complete compilation of the diversity of these sedimentary sequences. They are broadly classifi ed here as exposed bedrock coasts (type A), back barrier deposits (type B), transgressive barrier ridges (type C), and barrier-island complexes (type D), according to localized conditions of upland migration potential, wave exposure, and sediment supply. These Brazilian systems present a paradigm for understanding future coastal response to climate change and accelerated sea-level rise: the recognition of a minimum threshold sea-level-rise rate of ~2 mm yr -1 above which transgression proceeded too rapidly for the formation of these stable accretionary shoreline features demonstrates the nonlinearity of coastal response to sea-level change, and the site specifi city of conditions associated with the formation of each highstand deposit type, even within a single small embayment, demonstrates the non-uniformity of that response.

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Section: Regional Variability In Southern Hemisphere Sea-level Changesupporting

confidence: 69%

Coastal response to late-stage transgression and sea-level highstand

Hein¹,

FitzGerald²,

Menezes³

et al. 2014

Geological Society of America Bulletin

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“…Hart 1870, Angulo et al 2006). In addition, it should also be taken into consideration that the time of deposition could differ from the age of the bioclasts and the cement (Angulo et al 2013, Angulo and. Castro et al (2014) did not consider these aspects, which are critical for their assertion: "for the first time on the Brazilian coast it was identified a negative record of relative sea-level during Late Pleistocene and Early Holocene transition".…”

Section: Reply To Castro Et Al 2018 1379mentioning

confidence: 99%

Reply to Castro et al. 2018 on “Holocene paleo-sea level changes along the coast of Rio de Janeiro, southern Brazil”.

Ângulo

Giannini²,

Souza

et al. 2018

An. Acad. Bras. Ciênc.

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Discussions are useful to the advance of science, and we appreciate the opportunity to discuss the paper by Castro et al. (2014) for the second time. Here we maintain the interpretations presented in our discussion paper (Angulo et al. 2016). In the discussion paper we emphasized that the vertical position of a paleo-sea level indicator is not the position of the paleo-sea level. We pointed out that: (1) to reconstruct paleo-sea levels it is crucial to determine the vertical distance between the indicators to their present homologous one; (2) margin of errors can only be established if considering the indicator's intrinsic characteristics and (3) the interpretation of a sea level 3.0 to 4.5 m below the present one at 11.9 to-11.1 ka BP is in strong contradiction with worldwide established data and would require a detailed discussion. We consider that Castro et al. (2018) do not properly address or answer the comments we made in the discussion paper. More work and discussions are necessary to elucidate several questions that still remain about the sea level behavior in the Holocene.

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“…Contudo, paleoentalhes não foram descritos. Angulo et al (2013a), a partir da profundidade dos entalhes atuais, de até 2,5 m e taxa de corrosão anual de 5,0 mm, que corresponde à taxa máxima verificada em outros locais (Pirazzoli 1986), estimaram que o nível do mar tivesse variação inferior a 30 cm, pelo menos, nos últimos 500 anos. Medições da taxa de corrosão local poderiam auxiliar a precisar o período de estabilização do nível do mar no arquipélago.…”

Section: Erosivos (A) Entalhes Marinhosunclassified

“…Figura 12: Entalhes de surfe em arenitos bioclásticos eólicos e praiais, na Ilha Rasa (a) e na Ponta das Caracas (b), no arquipélago de Fernando de Noronha (Angulo et al 2013a).…”

Section: Erosivos (A) Entalhes Marinhosunclassified

“…A ocorrência mais meridional foi registrada na latitude de 28º 36' S, no Cabo de Santa Marta, em Santa Catarina (Angulo et al 1999). Mais recentemente também foram apresentadas reconstruções de PNM nos arquipélagos de Fernando de Noronha (Angulo et al 2013a) e São Pedro & São Paulo (Angulo et al 2013b). Embora a precisão na reconstrução de PNM a partir de vermetídeos possa alcançar ± 10 cm em locais com baixo grau de exposição às ondas (Laborel 1986), a maior parte das reconstruções encontradas em trabalhos anteriores sobre a costa brasileira consideram margens de erro de ± 50 cm a ± 1,0 m (Angulo et al 1999(Angulo et al e 2006.…”

Section: (A) Construções De Vermetídeosunclassified

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Revisão conceitual de indicadores costeiros de paleoníveis marinhos quaternários no Brasil

Ângulo

Souza

2014

ABEQUA

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As variações do nível do mar durante o Quaternário no Brasil têm sido estudadas desde trabalhos pioneiros do século XIX. Desde então, centenas de trabalhos têm contribuído para melhor entendê-las. Apesar disto, o conhecimento ainda é incompleto e controvérsias persistem na literatura. Deste modo, para contribuir no conhecimento das variações do nível do mar no Quaternário no Brasil, foi realizada a revisão conceitual dos indicadores de paleoníveis marinhos utilizados em trabalhos anteriores. Na revisão, é apresentada proposta de classificação dos indicadores, descrição de suas características e discussão das incertezas e erros de interpretação. Finalmente, sugere-se a elaboração de mais e mais precisas curvas locais e regionais de nível relativo do mar para poder discriminar as diversas componentes das variações eustáticas e aparentes do nível do mar.

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Quaternary sea-level changes and aeolianites in the Fernando de Noronha archipelago, northeastern Brazil

Cited by 24 publications

References 15 publications

Coastal response to late-stage transgression and sea-level highstand

Coastal response to late-stage transgression and sea-level highstand

Reply to Castro et al. 2018 on “Holocene paleo-sea level changes along the coast of Rio de Janeiro, southern Brazil”.

Revisão conceitual de indicadores costeiros de paleoníveis marinhos quaternários no Brasil

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