Taphonomy of Spores of Pteridophyta Detected in Quaternary Peat Sediments in Rio de Janeiro, Brazil

Detalhes bibliográficos
Autor(a) principal: Bartholomeu, Robson Lucas
Data de Publicação: 2013
Outros Autores: Barros, Marcia Aguiar de, Barth, Ortrud Monika
Tipo de documento: Artigo
Idioma: por
Título da fonte: Anuário do Instituto de Geociências (Online)
Texto Completo: https://revistas.ufrj.br/index.php/aigeo/article/view/6949
Resumo: Taphonomy is a tool used in palaeoenvironmental interpretations dating back to the process of palynomorphs deposition. The interpretation of taphonomic studies provides subsidies to the understanding of the environmental past conditions through the marks left on the preserved palynomorphs. The study area is located in the Praia Vermelha, Urca district, municipality of Rio de Janeiro, in the entrance of Guanabara Bay. The preservation of spores inside a columnar profile, constituted of peat and sandy mud sediments, was studied, comprising a time interval from about 4,520 to 4,270 years B.P. Eight levels were selected and sampled. The spores were classified according to the type of deterioration, by damages of corrosion and degradation and by mechanical damages. The percentage of each kind of deterioration was calculated in relation to the total number of counted spores and the concentration in relation to one cm³ of sediment. A large number of spores presenting corrosion and degradation damages was observed, being characteristic of air exposure, indicating occasions of lower water availability in this site. The predominance of undamaged spores in some levels suggests an underwater sedimentation, corroborated by sedimentary analyses.
id UFRJ-21_d9e42a4ce78bf2208326265e3c751305
oai_identifier_str oai:www.revistas.ufrj.br:article/6949
network_acronym_str UFRJ-21
network_name_str Anuário do Instituto de Geociências (Online)
repository_id_str
spelling Taphonomy of Spores of Pteridophyta Detected in Quaternary Peat Sediments in Rio de Janeiro, BrazilTafonomia de Esporos de Pteridófitas Encontrados em Sedimentos Turfosos Quaternários do Rio de Janeiro, BrasilTaphonomy is a tool used in palaeoenvironmental interpretations dating back to the process of palynomorphs deposition. The interpretation of taphonomic studies provides subsidies to the understanding of the environmental past conditions through the marks left on the preserved palynomorphs. The study area is located in the Praia Vermelha, Urca district, municipality of Rio de Janeiro, in the entrance of Guanabara Bay. The preservation of spores inside a columnar profile, constituted of peat and sandy mud sediments, was studied, comprising a time interval from about 4,520 to 4,270 years B.P. Eight levels were selected and sampled. The spores were classified according to the type of deterioration, by damages of corrosion and degradation and by mechanical damages. The percentage of each kind of deterioration was calculated in relation to the total number of counted spores and the concentration in relation to one cm³ of sediment. A large number of spores presenting corrosion and degradation damages was observed, being characteristic of air exposure, indicating occasions of lower water availability in this site. The predominance of undamaged spores in some levels suggests an underwater sedimentation, corroborated by sedimentary analyses.A Tafonomia é uma ferramenta usada em interpretações paleoambientais que remonta ao processo de deposição dos palinomorfos. A interpretação dos processos tafonômicos fornece subsídios para a compreensão das condições ambientais passadas, através de marcas preservadas nos palinomorfos. A área de estudo localiza-se na Praia Vermelha, bairro da Urca, município do Rio de Janeiro, entrada da Baía de Guanabara. Foi estudada a preservação dos esporos ocorrentes em um perfil estratigráfico, formado por sedimentos turfosos e areno-lamosos, abrangendo o intervalo de tempo entre cerca de 4.520 a 4.270 anos A.P. Oito níveis foram selecionados e amostrados. Os esporos encontrados foram agrupados de acordo com o tipo de deterioração, em danos de corrosão/degradação, mecânicos e sem danos. A percentagem de cada tipo de dano foi calculada em relação ao total de esporos contados e a concentração em relação a 1cm³ de sedimento. Foi encontrado um grande número de esporos com danos de corrosão e degradação, característicos de exposição ao ar, indicando ter havido ocasiões de menor disponibilidade de água no local. O predomínio de esporos sem danos em alguns níveis sugere uma sedimentação subaquosa, corroborado pelas análises sedimentológicas realizadas.Universidade Federal do Rio de Janeiro2013-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/694910.11137/2013_1_55_63Anuário do Instituto de Geociências; Vol 36, No 1 (2013); 55-63Anuário do Instituto de Geociências; Vol 36, No 1 (2013); 55-631982-39080101-9759reponame:Anuário do Instituto de Geociências (Online)instname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJporhttps://revistas.ufrj.br/index.php/aigeo/article/view/6949/5516Copyright (c) 2013 Anuário do Instituto de Geociênciashttp://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessBartholomeu, Robson LucasBarros, Marcia Aguiar deBarth, Ortrud Monika2017-01-23T22:37:23Zoai:www.revistas.ufrj.br:article/6949Revistahttps://revistas.ufrj.br/index.php/aigeo/indexPUBhttps://revistas.ufrj.br/index.php/aigeo/oaianuario@igeo.ufrj.br||1982-39080101-9759opendoar:2017-01-23T22:37:23Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)false
dc.title.none.fl_str_mv Taphonomy of Spores of Pteridophyta Detected in Quaternary Peat Sediments in Rio de Janeiro, Brazil
Tafonomia de Esporos de Pteridófitas Encontrados em Sedimentos Turfosos Quaternários do Rio de Janeiro, Brasil
title Taphonomy of Spores of Pteridophyta Detected in Quaternary Peat Sediments in Rio de Janeiro, Brazil
spellingShingle Taphonomy of Spores of Pteridophyta Detected in Quaternary Peat Sediments in Rio de Janeiro, Brazil
Bartholomeu, Robson Lucas
title_short Taphonomy of Spores of Pteridophyta Detected in Quaternary Peat Sediments in Rio de Janeiro, Brazil
title_full Taphonomy of Spores of Pteridophyta Detected in Quaternary Peat Sediments in Rio de Janeiro, Brazil
title_fullStr Taphonomy of Spores of Pteridophyta Detected in Quaternary Peat Sediments in Rio de Janeiro, Brazil
title_full_unstemmed Taphonomy of Spores of Pteridophyta Detected in Quaternary Peat Sediments in Rio de Janeiro, Brazil
title_sort Taphonomy of Spores of Pteridophyta Detected in Quaternary Peat Sediments in Rio de Janeiro, Brazil
author Bartholomeu, Robson Lucas
author_facet Bartholomeu, Robson Lucas
Barros, Marcia Aguiar de
Barth, Ortrud Monika
author_role author
author2 Barros, Marcia Aguiar de
Barth, Ortrud Monika
author2_role author
author
dc.contributor.author.fl_str_mv Bartholomeu, Robson Lucas
Barros, Marcia Aguiar de
Barth, Ortrud Monika
description Taphonomy is a tool used in palaeoenvironmental interpretations dating back to the process of palynomorphs deposition. The interpretation of taphonomic studies provides subsidies to the understanding of the environmental past conditions through the marks left on the preserved palynomorphs. The study area is located in the Praia Vermelha, Urca district, municipality of Rio de Janeiro, in the entrance of Guanabara Bay. The preservation of spores inside a columnar profile, constituted of peat and sandy mud sediments, was studied, comprising a time interval from about 4,520 to 4,270 years B.P. Eight levels were selected and sampled. The spores were classified according to the type of deterioration, by damages of corrosion and degradation and by mechanical damages. The percentage of each kind of deterioration was calculated in relation to the total number of counted spores and the concentration in relation to one cm³ of sediment. A large number of spores presenting corrosion and degradation damages was observed, being characteristic of air exposure, indicating occasions of lower water availability in this site. The predominance of undamaged spores in some levels suggests an underwater sedimentation, corroborated by sedimentary analyses.
publishDate 2013
dc.date.none.fl_str_mv 2013-01-01
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://revistas.ufrj.br/index.php/aigeo/article/view/6949
10.11137/2013_1_55_63
url https://revistas.ufrj.br/index.php/aigeo/article/view/6949
identifier_str_mv 10.11137/2013_1_55_63
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://revistas.ufrj.br/index.php/aigeo/article/view/6949/5516
dc.rights.driver.fl_str_mv Copyright (c) 2013 Anuário do Instituto de Geociências
http://creativecommons.org/licenses/by/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2013 Anuário do Instituto de Geociências
http://creativecommons.org/licenses/by/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
publisher.none.fl_str_mv Universidade Federal do Rio de Janeiro
dc.source.none.fl_str_mv Anuário do Instituto de Geociências; Vol 36, No 1 (2013); 55-63
Anuário do Instituto de Geociências; Vol 36, No 1 (2013); 55-63
1982-3908
0101-9759
reponame:Anuário do Instituto de Geociências (Online)
instname:Universidade Federal do Rio de Janeiro (UFRJ)
instacron:UFRJ
instname_str Universidade Federal do Rio de Janeiro (UFRJ)
instacron_str UFRJ
institution UFRJ
reponame_str Anuário do Instituto de Geociências (Online)
collection Anuário do Instituto de Geociências (Online)
repository.name.fl_str_mv Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)
repository.mail.fl_str_mv anuario@igeo.ufrj.br||
_version_ 1797053538659991552

Registros relacionados