Evidence for Late Quaternary episodic uplift of the São Pedro and São Paulo Archipelago, Equatorial Atlantic

Ângulo, Rodolfo José; Souza, Marilei de Melo Tavares e; Campos, Thomas Ferreira da Costa; Bezerra, Francisco H.R.; Fernandes, Luiz Alberto; Giannini, Paulo César Fonseca; Pitombo, Fábio Bettini; Veiga, Fernando Alvim

doi:10.1016/j.quaint.2013.06.023

Cited by 16 publications

(9 citation statements)

References 18 publications

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“…B.P. [17,24] . SPSPA shows an overall minimum average uplift rate of 1.5 mm/yr and a maximum uplift rate of 3.0 mm/yr.…”

Section: Geological Contextmentioning

confidence: 99%

Structural Evidences for Present-day Compressive Tectonics at the St. Peter and St. Paul Archipelago (Equatorial Atlantic Ocean)

Campos¹,

Motoki²,

Sichel³

et al. 2021

Preprint

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This paper discusses the tectonics of the St. Peter and St. Paul Archipelago (SPSPA) in the Equato-rial Atlantic Ocean, based on the joint-system geometry which show a North-South shorten-ing/transpressional uplift tectonism, is active leading to exhumation of the sub-oceanic mantle. These islets are the summits of a sigmoidal submarine ridge formed by mantle ultramafic rocks. The ridge is crossed by the principal transform deformation zone of the northern transform fault of the St. Paul Multifault System. The South flank ridge exposes serpentinized mantle perido-tites, while the North flank exposes strongly deformed/fractured ultramylonites, recording duc-tile and brittle deformation at lithospheric conditions. The SPSPA show multiple joint systems cutting mylonitic foliation of the exposed rocks, forming three main families: high-angle paral-lel joints of tectonic origin, serpentinization-related joints with random direction and load-release low-angle parallel joints. The tectonic joints show an average direction of N31°E and N28°W, forming a conjugate system with a N1ºW compression axes, coherent with a trans-pressive stress field. Accordingly, the earthquakes focal mechanism close to the islets also shows N-S compression. The previously reported active uplift with an average rate of 1.5 mm/year and the directions of the joint system here reported agreeing with a present-day active N-S compres-sive field at a high angle with the direction of the transform fault.

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“…B.P. [17,24] . SPSPA shows an overall minimum average uplift rate of 1.5 mm/yr and a maximum uplift rate of 3.0 mm/yr.…”

Section: Geological Contextmentioning

confidence: 99%

Structural Evidences for Present-day Compressive Tectonics at the St. Peter and St. Paul Archipelago (Equatorial Atlantic Ocean)

Campos¹,

Motoki²,

Sichel³

et al. 2021

Preprint

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show abstract

“…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

“…Segundo estudos recentes, ocorrem na costa brasileira, continental e insular, 16 espécies correspondentes a quatro gêneros de vermetídeos (Spotorno et al 2012). Já os fósseis têm sido atribuídos apenas a Petaloconchus varians (Angulo et al 2006) e a Dendropoma irregulare (Angulo et al 2013b). Assim, para avaliar este fator seriam necessários estudos sobre a distribuição vertical das espécies de vermetídeos vivos e sobre a taxonomia dos fósseis.…”

Section: (A) Construções De Vermetídeosunclassified

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Revisão conceitual de indicadores costeiros de paleoníveis marinhos quaternários no Brasil

Ângulo

Souza

2014

ABEQUA

Self Cite

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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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“…However, these gastropods are found building reefs in Angra dos Reis (Rio de Janeiro, Brazil) (Breves-Ramos, 2012). Only two of them are described as fossils in Brazil: Petaloconchus varians (Angulo et al, 1999(Angulo et al, , 2006Dias, 2009) and Dendropoma irregulare (Angulo et al, 2013). Concerning Armação dos Búzios (Rio de Janeiro, Brazil), only records of P. varians have been described by Martin et al (1997) and Dias (2009)…”

Section: Introductionmentioning

confidence: 99%

Holocene Paleo-Sea Level in Southeastern Brazil: An Approach Based on Vermetids Shells

et al. 2017

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This paper reconstructs the relative sea level changes during the Holocene on the southeastern Brazilian coastal region (Armação dos Búzios city, at north of Rio de Janeiro state), based on the presence of rocky bottom worm snails, Vermetidae (Mollusca: Gastropoda) as bioindicators. Chronology was established by radiocarbon Accelerator Mass Spectrometry technique. Three evolutionary stages of sea level were established: sea-level lower than the current one between 8,148-6,300 cal yr BP, a rising of sea level between 6,300-4,500 cal yr BP, with a transgressive maximum of about 2.4 m above the present level at 4,700-4,500 cal yr BP, and a sea level drop from 4,500 cal yr BP until the present.

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Evidence for Late Quaternary episodic uplift of the São Pedro and São Paulo Archipelago, Equatorial Atlantic

Cited by 16 publications

References 18 publications

Structural Evidences for Present-day Compressive Tectonics at the St. Peter and St. Paul Archipelago (Equatorial Atlantic Ocean)

Structural Evidences for Present-day Compressive Tectonics at the St. Peter and St. Paul Archipelago (Equatorial Atlantic Ocean)

Revisão conceitual de indicadores costeiros de paleoníveis marinhos quaternários no Brasil

Holocene Paleo-Sea Level in Southeastern Brazil: An Approach Based on Vermetids Shells

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