scholarly journals Assembleia de Moluscos da Região do Pântano do Ramalho, Cabo Frio, RJ: Indicadores Biológicos de Variação do Nível Relativo do Mar Durante o Holoceno

2011 ◽  
Vol 34 (2) ◽  
pp. 46-52
Author(s):  
Aline Meneguci da Cunha ◽  
Fábio Ferreira Dias ◽  
Vera Maria Medina da Fonseca ◽  
João Wagner de Alencar Castro
Keyword(s):  
Sea Level ◽  
Coastal Plain ◽  
Rio De Janeiro ◽  
Wide Distribution ◽  
Northern Coast ◽  
Mollusk Shells ◽  
Low Degree ◽  
Absolute Dating ◽  
Dating Method ◽  
Cabo Frio

In the coastal plain of the Una river, county of the Cabo Frio, the northern coast of the State of Rio de Janeiro, are found biological evidences of change in relative sea level during the Holocene, represented by dense accumulations and wide distribution composed predominantly of mollusk shells. This paper aims to describe a new occurrence of accumulation of mollusk shells in the region of Ramalho's marsh, coastal plain of the Una river. The study area is located within the Portal de Buzios condominium, Amaral Peixoto Highway (RJ-106) at Km 125 between the coordinates 42º03'29"W and 22 º44'53"S. The survey of altimetry database shells was performed by tracking DGPS Pro Mark 2. To perform the taxonomic analysis, paleoecological, and geochronological were collected approximately 1.75 dm³ of mollusk shells in a trench of 0.50 cm, excavated at the edge of a small dam in the area of the Portal de Búzios condominium. Approximately 100 grams of the specie Anomalocardia brasiliana shells were sent to the absolute dating method radicarbon to Beta Analytic Inc., Miami - USA. Data obtained from a DGPS Pro Mark 2 show an altitude of 0,90 m above actual sea level. Only three species of mollusks were identified in this filing: Anomalocardia brasiliana, Lucina pectinata and Crassostrea rizophorae. A. brasiliana and L. pectinata have not joined infaunal habit, live in muddy or sandy bottoms. C. rizophorae epifaunal habit has stuck, living in rocky and gravel substrata. The three species have water depths ranging from 0 to 30 m depth. Most of the shells found present a low degree of fragmentation and corrosion, indicating little or none transportation. Some shells of L. pectinata and A. brasiliana are articulated, and the shells of C. rizophorae are embedded in the shells of other species. The conventional age of the deposit is 5780 À 70 years BP, calibrated by CALIB 5.0 program in 5997-6333 cal. years BP. These data are similar ages found in deposits along the northern coast of Rio de Janeiro state, Brazil.

scholarly journals AN APPROACH TO THE CONTRIBUTION OF ANTHROPOGENIC ACTIONS FOR THE ARARUAMA LAGOONAL SYSTEM (SE BRAZIL) GEOMORPHOLOGICAL EVOLUTION / UMA ABORDAGEM SOBRE A INFLUÊNCIA ANTROPOGÊNICA NA EVOLUÇÃO GEOMORFOLÓGICA DO SISTEMA LAGUNAR DE ARARUAMA (SE, BRASIL)

2018 ◽  
Vol 3 (2) ◽  
pp. 108-120
Author(s):  
Olegário Nelson Azevedo Pereira ◽  
Maria Antonieta Da Conceição Rodrigues ◽  
João Manuel Alveirinho Dias
Keyword(s):  
Sea Level ◽  
Rio De Janeiro ◽  
Historical Documents ◽  
Before Present ◽  
Sea Level Changes ◽  
Economic Exploitation ◽  
Se Brazil ◽  
Geomorphological Evolution ◽  
Janeiro State ◽  
Cabo Frio

The first studies regarding the constitution of the Araruama lagoonal system, located in the Rio de Janeiro state (SE Brazil), were carried out by Alberto Ribeiro Lamego. This author supported the thesis that it had resulted from the formation of a sand barrier (called Massambaba) due to the longitudinal transport of large quantities of sediments through coastal drift currents, and the growth of spits parallel to the shoreline. However, most recent studies largely rejected it, sustaining that the confinement of these hydric environments was the result of the growth of two sand barriers during the Pleistocene and Holocene times (120.000 to 7.000 years before present - BP) due to the sea level changes. The hypothesis that we suggest, is that both propositions are acceptable and complementary. This study aims to demonstrate that, despite the opinions on the formation of the double sand barrier, deposition of sediments by coastal drift currents at the end of the Holocene, and especially in recent chronologies, also contributed to the establishment of this lagoon system. In our opinion, the increased sediment supplies due to human activities contributed to the formation of the inner spits and the nearby sea sandbar. Its orientation was influenced by the existence of the island of Cabo Frio, that allowed the formation of the tombolo that almost connected it to the continent. Through the analysis of historical and cartographic documents related to the colonization and economic exploitation of the region, it is evident that the anthropogenic actions played a significant role in the sandy spits formation. Of these, special emphasis is placed on the agriculture and deforestation that contributed to the increase of sedimentary accumulation. This work demonstrate that the analysis of historical documents can provide information and contribute to the understanding of recent coastal developments. ResumoOs primeiros estudos sobre a constituição do sistema lagunar de Araruama, localizado no estado do Rio de Janeiro (SE Brasil), foram realizados por Alberto Ribeiro Lamego. Este autor apoiou a tese de que este sistema lagunar resultou da formação de uma barreira arenosa (denominada Massambaba) na sequência do transporte longitudinal de grandes quantidades de sedimentos através das correntes costeiras de deriva litorânea e ao crescimento de flechas arenosas paralelas à linha de costa. No entanto, estudos mais recentes, rejeitaram amplamente esta hipótese, e sugeriram que o confinamento desses ambientes lagunares resultou do crescimento de duas barreiras arenosas na sequência de mudanças no nível do mar ocorridas durante os períodos Pleistocénicos e Holocênico (120.000 a 7.000 anos antes do presente - BP). A hipótese que sugerimos é que ambas as hipóteses são aceitáveis e complementares. Este estudo tem como objetivo demonstrar que, apesar das opiniões sobre a formação da dupla barreira de areia, a deposição de sedimentos por correntes de deriva costeira no final do Holoceno, e principalmente em cronologias recentes, também contribuiu para o estabelecimento deste sistema lagunar. Em nossa opinião, o aumento do fornecimento de sedimentos devido às atividades humanas contribuiu para a formação das flechas arenosas interiores e do banco de areia exterior, próximo do mar. A sua orientação foi influenciada pela existência da ilha de Cabo Frio, que permitiu a formação do tombolo que quase a conectou ao continente.Através da análise de documentos históricos e cartográficos relacionados com a colonização e exploração econômica da região, evidencia-se que as ações antropogênicas tiveram um papel significativo na formação das flechas arenosas. De entre estas, salienta-se especialmente a agricultura e o desmatamento que contribuíram para o aumento da acumulação sedimentar. Este trabalho evidencia que a análise de documentos históricos pode fornecer informações e contribuir para a compreensão da evolução recente do litoral.

scholarly journals ANALYSIS OF PARTICULATE ORGANIC MATTER IN HOLOCENE SEDIMENTS OF COASTAL PLAIN FROM PERO BEACH, CABO FRIO, RIO DE JANEIRO, BRAZIL

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Taísa Camila Silveira de Souza ◽  
Marcelo De Araujo Carvalho ◽  
Fabio Ferreira Dias ◽  
Cintia Ferreira Barreto ◽  
Alex Da Silva de Freitas ◽  
...  
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Coastal Plain ◽  
Rio De Janeiro ◽  
Holocene Sediments ◽  
Cabo Frio

The Marine Reservoir Effect on the Coast of Rio de Janeiro: Deriving ∆R Values from Fish Otoliths and Mollusk Shells

Radiocarbon ◽  
2018 ◽  
Vol 60 (4) ◽  
pp. 1151-1168 ◽  
Author(s):  
Kita D Macario ◽  
Eduardo Q Alves ◽  
André Luiz Belém ◽  
Orangel Aguilera ◽  
Thayse Bertucci ◽  
...  
Keyword(s):  
Rio De Janeiro ◽  
Ocean Dynamics ◽  
Freshwater Input ◽  
Terrestrial Organic Matter ◽  
Reservoir Effect ◽  
Mollusk Shells ◽  
Marine Influence ◽  
The Impact ◽  
Western Portion ◽  
Cabo Frio

ABSTRACTConsidering the impact of coastal dynamics on the radiocarbon (14C) marine reservoir effect (MRE), upwelling has the potential of enhancing marine influence, usually14C depleted. Freshwater input can contribute either to increased reservoir offsets, when dead carbon from rock weathering is available, but also towards an atmospheric14C signal, when the presence of terrestrial organic matter from catchment prevails. An overview of the MRE studies based on shellmounds on the coast of Rio de Janeiro reveals a pattern of negative local corrections for Saquarema and Rio das Ostras but positive values for Cabo Frio island, suggesting the presence of cold upwelling waters in Cabo Frio at 1.6–1.2 cal kBP. New results for a shellmound on the Ilha Grande island, in the western portion of the Rio de Janeiro coast, revealed a negative value at about 3 ka. We discuss distribution of MRE values and temporal variability in the region and their relation to ocean dynamics, continental input and the choice of marine organisms used for ∆R determination. A comparison of local reservoir offsets for the Saquarema region obtained from fish otolith and mollusk shells revealed similar ΔR distributions, showing that both materials can be equally used.

scholarly journals Palynological evidence of the replacement of the hygrophilous forest by field vegetation during the last 7,000 years B.P. in the northern coast of Rio de Janeiro, Brazil

2011 ◽  
Vol 83 (3) ◽  
pp. 939-952 ◽  
Author(s):  
Cynthia F.P. da Luz ◽  
Ortrud M. Barth ◽  
Louis Martin ◽  
Cleverson G. Silva ◽  
Bruno J. Turcq
Keyword(s):  
Coastal Plain ◽  
Rio De Janeiro ◽  
Partial Replacement ◽  
First Episode ◽  
Northern Coast ◽  
Palynological Analysis ◽  
Indigenous Groups ◽  
Lake Cores ◽  
Janeiro State ◽  
Paraíba Do Sul River

Historians claim that European colonizers of the northern coast of Rio de Janeiro State found vast herbaceous fields when arrived in this region. Hypotheses about the origin of these fields include forest burning by the Goitacás indians and periodical floods by the Paraíba do Sul River and the lagoon system. The palynologycal analysis of two lake cores obtained in the municipality of Campos dos Goytacazes revealed opening episodes of hygrophilous forest and the establishment of field vegetation, recorded at ca. 6,500 and ca. 4,000 14C yr BP. The partial replacement of forest by field vegetation in the first episode was probably caused by floods of the lower areas during the development of the Holocene lagoon phase. During the second episode, successions of vegetational patterns occurred due to lowering of the sea level. Drying and enlarging of the coastal plain have allowed its colonization by herbs and heliophyte plants. The palynological analysis does not provide any evidence that sustains the theories of use of fire and agricultural activities by indigenous groups during these periods.

HOLOCENE EVOLUTION OF A WAVE-DOMINATED BARRIER-LAGOON SYSTEM IN RIO DE JANEIRO, BRAZIL

Radiocarbon ◽  
2020 ◽  
pp. 1-17
Author(s):  
Rafael Cuellar de Oliveira e Silva ◽  
Gilberto Tavares de Macedo Dias ◽  
Rodrigo Coutinho Abuchacra ◽  
Sérgio Cadena de Vasconcelos ◽  
Kita Chaves Damasio Macario ◽  
...  
Keyword(s):  
Sea Level ◽  
Coastal Plain ◽  
Rio De Janeiro ◽  
Marine Transgression ◽  
Sea Level Variation ◽  
South Wales ◽  
New Construction ◽  
Percussion Drilling ◽  
Prior Models

ABSTRACT In a wave-dominated coast, most of the Jacarepaguá coastal plain is occupied by buildings. During a new construction in this region at Barra da Tijuca, the subsurface area was excavated, exposing its quartzose sand nature, with a high mollusk shell concentration and in situ echinoderms at –10 m depth. The possibility to access this area encouraged us to investigate the evolution of the coastal plain. A 7.84-m-long core was recovered by percussion drilling. Stratigraphic, grain size, and geochemical analysis were undertaken. Three carbonate samples were dated by radiocarbon accelerator mass spectrometry (14C AMS). The revised sea-level variation curve revealed that the last postglacial marine transgression reached the present mean sea-level at 7945–7500 cal BP. The sandy deposit bottom was an ancient shoreface, with in situ echinoderms buried at 7770–7540 cal BP by the Pleistocene inner barrier reworking due to the last marine transgression. The Holocene outer barrier-lagoon and its flood tidal delta were formed from 5440–5070 cal BP. Mid-Holocene marine regression allowed the outer barrier progradation and the lagoon shallowing/infill. This paper confirms prior models proposed by other researchers for the Rio de Janeiro central coast and shows its similarity with the New South Wales coast, Australia.

scholarly journals The upper pleistocene of São Francisco do Sul Island coastal plain: geomorphologic, sedimentologic and evolutive aspects

2008 ◽  
Vol 56 (3) ◽  
pp. 179-187 ◽  
Author(s):  
Norberto Olmiro Horn Filho ◽  
Daniel Higueras Simó
Keyword(s):  
Sea Level ◽  
Coastal Plain ◽  
Crystalline Basement ◽  
Heavy Minerals ◽  
Brazilian Coast ◽  
Northern Coast ◽  
Coastal Plains ◽  
Upper Pleistocene ◽  
Sandy Sediments ◽  
Regressive Phase

The upper Pleistocene deposits (± 120 ky BP) outcrop in several coastal plains throughout the Brazilian coast. The occurrences in Santa Catarina State - Northern coast, where São Francisco do Sul Island is located are included in this context. The Pleistocene deposits which have marine and lagoon origin on the base and eolic origin on the top, characterize typical barrier island confined to crystalline basement elevations. The deposits outcrop on the central sector of São Francisco do Sul Island, close to the coastline, reaching up to 6 km of width and have variable heights from 12 to 17 m in elevations and 10 to 12 m in depressions. The geologic contact with the others coastal plain unities are interdigited and/or abrupt through scarps well defined that reach up to 4 m of vertical fall. The geomorphologic features consist in terraces exhibiting horizontal and undulated surface, dominating sandy sediments, fine to medium, well sorted, constituted by quartz and heavy minerals. These deposits were formed in higher sea level (8±2 m), between 18 to 120 ky BP, during regressive phase of the Sangamonian - Yarmoutian maximum transgression/regression, which is correlated to the interglacial Riss/Wurm, corresponding in Brazil to Cananéia transgression (SP), Penultimate transgression (BA) or barrier III (RS).

Vegetation of the southern part of Bolshevik Island (Severnaya Zemlya Archipelago)

2006 ◽  
pp. 3-87 ◽  
Author(s):  
N. V. Matveyeva
Keyword(s):  
Coastal Plain ◽  
Great Majority ◽  
Wide Distribution ◽  
Tundra Zone ◽  
Polar Desert ◽  
Character Species ◽  
Severnaya Zemlya ◽  
Severnaya Zemlya Archipelago ◽  
Desert Zone ◽  
Ecological Range

Bolshevik Isl. is the one of the largest islands within the Severnaya Zemlya archipelago. It is situated in the southern part of the polar desert zone. In the course of three field work trips in 1997, 1998 and 2000 years 252 relevees were made in its southern part on three geomorphologic surfaces: coastal plain, inner upland close to glacier and ancient high river terraces. As the result 27 syntaxonomical units of different rank (15 associations, 2 subassociations, 2 variants, and 8 community types) were described using Braun-Blanquet approach. All syntaxa, except one, are new and mostly similar to communities described on Franz Josef Land. The problems were to put new syntaxa into the higher level units (including class) within the syntaxonomical hierarchy. The main bulk of syntaxa, both zonal and intrazonal ones, has to be preliminary placed into Salicetea herbaceae class although there is a lot of reasons to consider zonal syntaxa as a new class that is specific for the polar desert zone. In any case, there are no one syntaxon that can be referred to Loiseleurio-Vaccinietea class that combines zonal vegetation in the tundra zone. The wide ecological range of great majority of species as well as the changes of their intralandscape distribution compare to the tundra zone made additional difficulties in finding character and differential species. 340 species (vascular plants — 52, mosses — 97, liverworts — 41, lichens — 150), that compiles 73 % of the whole island flora and 84 % of its southern part, were recorded within the all relevees. Almost half of these (182) are very rare on the island and 127 species were met 1—2 times. There are 70 species with wide ecological range throughout all landscape types with such commonly distributed herbs as Saxifraga cernua, S. hyperborea and Stellaria ed­ward­sii, mosses Polytrichastrum alpinum and Sanionia uncinata and lichen Stereocaulon rivulorum among these. Phippsia algida, the character species for snow bed communities, occurs in about 70 % of syntaxa. Useful for differentiation of syntaxa have been appeared 87 species. Few species with wide distribution within a landscape demonstrate their preference to a certain syntaxon by higher abundance (preferential character species). These are mostly bryophytes: mosses Bryum cryophilum and Grimmia torquata, and liver­worts Gymnomitrion corallioides, Marsupella arctica and Scapania crassiretis. Cryptogam species predo­minate in the whole flora as well as in each syntaxon. The number of species varies from 12 to 70 per sample plots 5÷5 m and from 20 to 195 in different syntaxa. The richest in species (70 per community and about 190 for association) are zonal plant communities on the accumulative coastal plain in the region of Sol­nechnaya Bay, the poorest one, with 10 and 20 species consequently, is ass. Hygrohypno polari—Saxifragetosum hyperboreae that was described on the upland, close to glacier in the inner part of island.

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

2016 ◽  
Vol 33 (3) ◽  
Author(s):  
Carolina Pereira Silvestre ◽  
André Luiz Carvalho da Silva ◽  
Maria Augusta Martins da Silva ◽  
Amilsom Rangel Rodrigues
Keyword(s):  
Internal Structure ◽  
Coastal Plain ◽  
Rio De Janeiro ◽  
The Holocene

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) for the understanding of the... 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...

LATE QUATERNARY SEA-LEVEL HIGHSTANDS OF THE MID-ATLANTIC US COASTAL PLAIN AND SUB-ORBITAL VARIABILITY WITH IMPLICATIONS FOR ICE SHEET SENSITIVITY

2016 ◽  
Author(s):  
Robert K. Poirier ◽  
◽  
Thomas M. Cronin ◽  
Thomas M. Cronin ◽  
Miriam E. Katz ◽  
...  
Keyword(s):  
Sea Level ◽  
Coastal Plain ◽  
Late Quaternary ◽  
Ice Sheet
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