Maria Augusta Martins da Silva

Universidade Federal Fluminense

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André Luiz Carvalho da Silva

Universidade do Estado do Rio de Janeiro

José Antônio Baptista Neto

Universidade Federal Fluminense

Carolina Pereira Silvestre

Universidade Federal Fluminense

Carla Luiza dos Santos

Universidade Federal Fluminense

Luiz Antônio Pierantoni Gamboa

Universidade Federal Fluminense

Amilson R. Rodrigues

Petrobras (Brazil)

Kita Macário

Universidade Federal Fluminense

Rosa Souza

Universidade Federal Fluminense

Amilsom Rangel Rodrigues

Instituto de Geociencias

MARCUS VINICIUS SANTORE SALVADOR

Subsea 7 (France)

Cooperative Institutions

Universidade Federal Fluminense

Universidade do Estado do Rio de Janeiro

Queen's University Belfast

Instituto de Geociencias

Petrobras (Brazil)

University of Arizona

Institut de l'Information Scientifique et Technique

Universidade de São Paulo

Subsea 7 (France)

Pennsylvania State University

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Caracterização do Sedimentos de Fundo e Dinâmica Sedimentar da Enseada de Jurujuba (Baía de Guanabara), Niterói, RJ.

Pesquisas em Geociências (1996)

José Antônio Baptista Neto Maria Augusta Martins da Silva

Sixty-four bottom surface sediment samples were collected in Jurujuba Bight using a Dietz LaFond grab sampler. They were analysed for grain size distribution, shape, mineralogy and geochemistry. From the association between the Bight bottom morphology and sediment characteristics, it was possible to establish the sedimentary dynamics. This allowed a division of the Bight into three sedimentary zones: an outer, sand-dominated zone of relatively high wave and current energy, an inner zone characterized by very calm conditions and clay/mud deposition and an intermediary zone of mixed sedimentary characteristics.

Deposition

10.22456/1807-9806.21221

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Citations (14)

Sedimentary architecture and depositional evolution of the Quaternary coastal plain of Maricá, Rio de Janeiro, Brazil

Brazilian Journal of Geology (2014)

André Luiz Carvalho da Silva Maria Augusta Martins da Silva Luiz Antônio Pierantoni Gamboa Amilson R. Rodrigues

The coastal geomorphology of Maricá (Rio de Janeiro state) is characterized by a large lagoon and by two sandy barriers that confine a series of small isolated chain-like lagoons. Data collected from ground-penetrating radar and boreholes from the central coastal plain of Maricá provided information on the sedimentary architecture and evolution of this area in the Quaternary. Six lithological units were identified comprising three depositional sequences limited by erosional surfaces, related to barrier-lagoon systems that migrated onshore, offshore, and longshore, giving rise to a sedimentary deposit 25 m thick or more. The data reveal a retrograding barrier overlying a basal mud unit which rests in unconformity upon Precambrian basement, thus characterizing an important Pleistocene transgression. A second Pleistocene barrier of 45,000 cal years BP migrated over a lagoonal mud unit (48,000-45,000 cal years BP) reaching over the previous barrier. A progradational phase followed due to a fall of sea level. A long interval of erosion of the barrier created an unconformity that represents the Pleistocene-Holocene boundary. A beachrock in nearby Itaipuaçu, 100 m offshore from the present-day beach, dated as 8,500 cal years BP marks the onset of Holocene sedimentation due to gradually rising sea level, which continued until at about 5,000 years ago. This promoted the retrogradation of the barrier-lagoon system. A brief episode of progradation is observed as a series of paleobeach scarps. Today's rising sea level is causing the retrogradation of the barrier.

Progradation

Marine transgression

Coastal plain

Basement

10.5327/z2317-4889201400020002

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Citations (31)

Dinâmica sazonal e os efeitos das ressacas nas praias de Niterói/RJ

Brazilian Journal of Geology (2004)

Carla Luiza dos Santos Maria Augusta Martins da Silva Marcus Vinicius Santore Salvador

Beaches are important for the protection of the coastal region against stormy waves. Therefore, beach conservation is fundamental but, contrary to that, beaches and related environments in the sandy barrier are frequently modified by human activity. The aim of this work is to present observations carried on from 1991 to 2002, on the beach dynamics of Niteroi (RJ), as a response to seasonal stormy waves. Topographic profiles obtained on the beach and shoreface, pointed out that some parts of the beaches are more vulnerable to stormy waves activity and thus need special attention since problems with urban constructions already exist. These areas are the northwest extreme of Icarai, both extremes of Piratininga and the northwest and center of Camboinhas beach.

10.5327/rbg.v34i3.1121

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Morfodinâmica e a estabilidade da praia de Piratininga, Niterói (RJ)

Brazilian Journal of Geology (2009)

André Luiz Carvalho da Silva Maria Augusta Martins da Silva Carla Luiza dos Santos

The Piratininga beach, some 2,5 km long and one of the most popular in Niteroi, has undergone major destruction of its sidewalks and concrete wall because of stormy waves. Thirty topographic profiles and twenty four samples were collected over five years to help resolve this problem and were compared with data collected in the 1970’s and 1990’s. The present wave regime is as follows: today normal moderate to weak waves come from the southeast and stormy waves come from the southwest and south. This produces the greatest variability in the beach profile at its west end. Similarly, the sands are relatively poor sorted at the west end of the beach. Comparison with profiles from the 70’s and 90’s shows no significant change over the last 30 years. Thus, the conclusion is that the beach has been in equilibrium with its wave regime for at least 30 years. This tell us that the engineering structures should either be improved along the beach or preferentialy be removed and let the original profile return.

10.5327/rbg.v39i4.1490

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Citations (2)

OCORRÊNCIA E ORIGEM DE BOLAS DE LAMA NAS PRAIAS DA ENSEADA DE JURUJUBA (BAÍA DE GUANABARA) − NITERÓI-RJ OCCURRENCE AND ORIGIN OF MUD BALLS ALONG THE BEACHES OF JURUJUBA SOUND (GUANABARA BAY) − NITERÓI-RJ

José Antônio Baptista Neto Maria Augusta Martins da Silva

This paper studies at the occurrence and origen of armoured mud balls on Sao Francisco and Charitas beaches - Jurujuba Sound (eastern Guanabara Bay), frequently found in the region after storms. The mud balls are mainly black, light grey and greenish, of various sizes, and covered by biodetritus, quartz or other fragments. The mud balls are similar to ones previously studied on a variety of modern environments including marine and lacustrine shorelines. Armoured mud balls can potentially become preserved in the geological record, thus the understanding of the modern environments of formation will aid the reconstruction of paleoenvironments. Mineralogical and geochemical studies allow the correlation between the mud balls and

Mud volcano

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Comportamento morfológico e sedimentar da praia de Itaipuaçú (Maricá, RJ)

Brazilian Journal of Geology (2008)

André Luiz Carvalho da Silva Maria Augusta Martins da Silva Carla Luiza dos Santos

The main objective of the present study, carried out in the Itaipuacu beach (Marica, Rio de Janeiro state), is to understand the morphological and sedimentary behaviour of this coastline along the last three decades. The methodology consisted of a continuous series of beach profiles employing Emery’s method (1961) obtained seasonally along 8 years, associated with grain size analysis of 40 samples collected from the beach surface. The data was then compared to work published in the 70’s. The results indicate that the western part of the beach arc is the most dynamic as consequence of local intense energy of S-SW storm waves. Morphology and sediment trends indicate that this dynamics decrease towards the east. The most abundant sediment is very coarse sand, however grain size decreases towards the east where a better sorted coarse sand is the most characteristic beach sediment. Comparison between this 8-year long series of profiles to profiles collected in the 70’s shows that, despite the great dynamics of the entire beach and in particular, the western extreme, the beach has maintained the same morphology, more important, its width, which is not an indication of beach erosion at the present time.

Coastal erosion

10.5327/rbg.v38i1.1346

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INTEMPERISMO DECORRENTE DA ACUMULAÇÃO DE SAL E A FORMAÇÃO DE ALVÉOLOS E TAFONI NOS AFLORAMENTOS DAS PRAIAS DE NITERÓI (RIO DE JANEIRO, BRASIL)

Revista Brasileira de Geomorfologia (2013)

Maria Augusta Martins da Silva José Antônio Baptista Neto André Luiz Carvalho da Silva Bernard Smith J.J. McAlister

Afloramentos de granitos e gnaisses nas praias de Niterói (RJ) apresentam morfologias desenvolvidas em decorrência do intemperismo da acumulação de sal na superfície da rocha. Pequenas depressões e bacias e, de modo mais organizado, morfologias denominadas alvéolos e tafoni, são freqüentemente encontradas na superfície das rochas. Este trabalho apresenta uma descrição dessas morfologias com ênfase na praia de Itacoatiara onde os melhores exemplos são encontrados. Nessa praia, 12 amostras foram analisadas (MEV, IC, AAS) permitindo a identificação de halita, gipsita, silvita, bischofita, mirabilita, thenardita e kieserita. Em função dos ciclos de cristalização desses sais durante períodos de seca e posterior dissolução, ocorre a desintegração das rochas e formação dessas morfologias. A frequência desses ciclos promove o rompimento das ligações entre os cristais e a fadiga das rochas gerando as morfologias com aspectos cavernosos. Características geológicas, tais como, planos de esfoliação, contatos litológicos, composição e textura das rochas, entre outras, apresentam papel importante no tipo de morfologia desenvolvida durante o intemperismo de sal.

10.20502/rbg.v14i2.335

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FORMAÇÃO DE ESCARPAS DE TEMPESTADE E SEU RECONHECIMENTO NO REGISTRO GEOLÓGICO: PLANÍCIE COSTEIRA DE MARICÁ (RIO DE JANEIRO, BRASIL)

Revista Brasileira de Geomorfologia (2017)

Maria Augusta Martins da Silva André Luiz Carvalho da Silva Carolina Pereira Silvestre

As escarpas de tempestade são feições marcantes em uma praia. Elas apresentam morfologias diagnósticas de seu modo de formação e, devido à possibilidade de preservação, podem ser utilizadas em estudos visando à reconstituição paleoambiental. Essas feições costeiras se formam quando ondas mais altas e de maior energia promovem o corte das camadas de sedimentos que formam as bermas causando o recuo das mesmas. O resultado é: (1) a formação de uma escarpa, cuja altura depende da altura das ondas; (2) o truncamento das camadas plano-paralelas horizontais a sub-horizontais das bermas; (3) a criação de uma superfície planar ou côncava inclinada para o mar na frente da escarpa. Nas últimas décadas, estudos sobre a estratigrafia e as sequências sedimentares quaternárias de áreas costeiras vêm utilizando cada vez mais o ground penetrating radar (GPR), no Brasil e no mundo. Em alguns casos, as imagens de GPR revelam refletores que correspondem a antigas superfícies relativas às escarpas de tempestade, facilmente correlacionadas com as observadas no ambiente moderno. Na região de Maricá (Rio de Janeiro), trabalhos realizados para caracterizar a planície costeira atual, bem como, aqueles conduzidos para desvendar o Quaternário dessa área, mostraram o papel importante das escarpas de tempestade e das superfícies de truncamento associadas como indicadores de antigas praias nas sequências sedimentares mapeadas. Assim, foi possível visualizar as antigas posições das praias formadas durante períodos de nível do mar mais altos que o atual e a subsequente progradação da linha de costa através do reconhecimento de uma sequência de paleoescarpas de tempestade migrando através da planície costeira até alcançar posições próximas à escarpa de tempestade atual.

10.20502/rbg.v18i4.1265

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Citations (1)

Geomorphology and Sedimentary Facies of the Maricá Lagoon (State of Rio de Janeiro, Brazil)

Springer earth system sciences (2021)

André Luiz Carvalho da Silva Carolina Pereira Silvestre Maria Augusta Martins da Silva José Antônio Baptista Neto Sérgio Cadena de Vasconcelos

Silt

10.1007/978-3-030-66161-8_12

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Citations (2)

INVESTIGATION OF THE INTERNAL STRUCTURE AND EVOLUTION OF THE HOLOCENE BARRIER OF MARICÁ (RIO DE JANEIRO, BRAZIL)

Brazilian Journal of Geophysics (2015)

Carolina Pereira Silvestre André Luiz Carvalho da Silva Maria Augusta Martins da Silva Amilsom Rangel Rodrigues

ABSTRACT. The objective of this study is the identification of the internal structure of the Holocene barrier of the Maricá coastal plain (Rio de Janeiro, Brazil) for the understanding of the evolution of this coast. The regional geomorphology is characterized by the large Maricá lagoon and by two sandy barriers which confines a series of small near-dry lagoons. Geophysical data obtained from ground-penetrating radar (GPR) images, with 400 and 200 MHz shielded antennae and borehole samples, both reaching down to about 10 meters in depth, provided information about the sedimentary architecture and geological and oceanographical processes responsible for the evolution of this area in the Holocene. The results show that the barrier internal structure is formed by a set of strata presenting different geometries, dip directions and organization, relative to the following depositional environments: dunes, washover fans, beach and tidal channels. It was possible to determine the importance of the sea level changes, longshore currents and overwash processes for the barrier development. Strong reflectors representing eolian strata dipping towards the continent point out to a phase of barrier retrogradation; afterwards, a succession of very well preserved beach paleoscarps, located south of the previous barrier, shows a phase of barrier progradation. Such evidences indicate that the barrier evolved according to the Holocene sea level fluctuations recognized for the Brazilian coast.Keywords: ground-penetrating radar, barrier-lagoon system, Holocene, Maricá coast. RESUMO. O presente estudo objetivou identificar a estrutura interna da barreira holocênica buscando compreender a evolução da planície costeira de Maricá (Rio de Janeiro). A geomorfologia regional é caracterizada pela Lagoa de Maricá e duas barreiras arenosas, separadas por pequenas lagunas colmatadas. Dados geofísicos obtidos com um georadar, com antenas de 400 e 200 MHz, e amostras de sondagem geológica, ambos até a profundidade média de 10 metros, forneceram informações sobre a arquitetura sedimentar e os processos geológicos e oceanográficos responsáveis pela evolução desta área no Holoceno. Os resultados mostram que a estrutura interna da barreira é formada por um conjunto de estratos de diferentes geometrias, direções de mergulho e modos de organização relacionados aos seguintes ambientes deposicionais: dunas, leques de arrombamento, praias e canais de maré. Essas características permitiram o entendimento da dinâmica costeira responsável pelo desenvolvimento da barreira, com destaque para as variações do nível do mar, correntes de deriva litorânea e mecanismos de sobrelavagem. Refletores marcantes representando estratos eólicos inclinados para o continente indicam uma fase de retrogradação da barreira; a esse episódio se seguiu um período marcado por sucessivas paleoescarpas de tempestade, localizadas mais ao sul, indicando uma fase de progradação. Essas evidências mostram que a barreira evoluiu de acordo com as fases de transgressão e regressão marinha do Holoceno reconhecidas para o litoral brasileiro.Palavras-chave: georadar, sistema barreira-laguna, Holoceno, litoral de Maricá.

Overwash

Progradation

Ground-Penetrating Radar

Coastal geography

10.22564/rbgf.v33i3.948

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Citations (7)