Distribution and Growth Morphology of the Recent Microbialites: the Case of Lagoa Salgada, Rio de Janeiro - Brazil
Autor(a) principal: | |
---|---|
Data de Publicação: | 2019 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Anuário do Instituto de Geociências (Online) |
Texto Completo: | https://revistas.ufrj.br/index.php/aigeo/article/view/30642 |
Resumo: | Organosedimentary deposits formed by interaction of carbonate and terrigenous sediments are commonly found in the Lagoa Salgada, a holocenic environment located on the north of Rio de Janeiro state which records environmental and biological information of their evolution. Microbial mats are widespread however stromatolites are very prominent and exposed nowadays in the lagoon. Microbial mats were distinguished into two main morphologies, colloform and polygonal mats. It is interesting to note that the colloform ones are not lithified unlike the polygonal ones. Related to stromatolites three main morphologies were defined and classified based on their external morphology and internal structure. Internal structure was further analyzed by sample cutting and thin section study to confirm field classification. Stromatolites are mostly bioherms dome-like and vary from 10 to 40cm high. Morphologically stromatolites are columnar or branched to columnar and coalescence among them are very common resulting in stratiform morphologies. Stromatolitic domal-like bioherms though showing similar internal structure were separated in small and large according to their size; the differences in size are clearly observed and have different areal distribution, which possibly reflects changes in the lagoon paleogeography during the geological time. Also, the identification of differences in the internal structure of stromatolites allows the formulation of hypothesis supporting environmental changes in the Lagoa Salgada. |
id |
UFRJ-21_bbcbf7ff31471a9a35423f3fb859c0ae |
---|---|
oai_identifier_str |
oai:www.revistas.ufrj.br:article/30642 |
network_acronym_str |
UFRJ-21 |
network_name_str |
Anuário do Instituto de Geociências (Online) |
repository_id_str |
|
spelling |
Distribution and Growth Morphology of the Recent Microbialites: the Case of Lagoa Salgada, Rio de Janeiro - Brazilrobial mats; Recent stromatoliteOrganosedimentary deposits formed by interaction of carbonate and terrigenous sediments are commonly found in the Lagoa Salgada, a holocenic environment located on the north of Rio de Janeiro state which records environmental and biological information of their evolution. Microbial mats are widespread however stromatolites are very prominent and exposed nowadays in the lagoon. Microbial mats were distinguished into two main morphologies, colloform and polygonal mats. It is interesting to note that the colloform ones are not lithified unlike the polygonal ones. Related to stromatolites three main morphologies were defined and classified based on their external morphology and internal structure. Internal structure was further analyzed by sample cutting and thin section study to confirm field classification. Stromatolites are mostly bioherms dome-like and vary from 10 to 40cm high. Morphologically stromatolites are columnar or branched to columnar and coalescence among them are very common resulting in stratiform morphologies. Stromatolitic domal-like bioherms though showing similar internal structure were separated in small and large according to their size; the differences in size are clearly observed and have different areal distribution, which possibly reflects changes in the lagoon paleogeography during the geological time. Also, the identification of differences in the internal structure of stromatolites allows the formulation of hypothesis supporting environmental changes in the Lagoa Salgada.Universidade Federal do Rio de JaneiroSilva, Douglas Rosa daMansur, Kátia LeiteAlmeida, Leonardo Fonseca Borghi de2019-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/3064210.11137/2019_1_439_453Anuário do Instituto de Geociências; Vol 42, No 1 (2019); 439-453Anuário do Instituto de Geociências; Vol 42, No 1 (2019); 439-4531982-39080101-9759reponame:Anuário do Instituto de Geociências (Online)instname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJenghttps://revistas.ufrj.br/index.php/aigeo/article/view/30642/17326Copyright (c) 2019 Anuário do Instituto de Geociênciashttp://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccess2019-12-10T15:03:30Zoai:www.revistas.ufrj.br:article/30642Revistahttps://revistas.ufrj.br/index.php/aigeo/indexPUBhttps://revistas.ufrj.br/index.php/aigeo/oaianuario@igeo.ufrj.br||1982-39080101-9759opendoar:2019-12-10T15:03:30Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)false |
dc.title.none.fl_str_mv |
Distribution and Growth Morphology of the Recent Microbialites: the Case of Lagoa Salgada, Rio de Janeiro - Brazil |
title |
Distribution and Growth Morphology of the Recent Microbialites: the Case of Lagoa Salgada, Rio de Janeiro - Brazil |
spellingShingle |
Distribution and Growth Morphology of the Recent Microbialites: the Case of Lagoa Salgada, Rio de Janeiro - Brazil Silva, Douglas Rosa da robial mats; Recent stromatolite |
title_short |
Distribution and Growth Morphology of the Recent Microbialites: the Case of Lagoa Salgada, Rio de Janeiro - Brazil |
title_full |
Distribution and Growth Morphology of the Recent Microbialites: the Case of Lagoa Salgada, Rio de Janeiro - Brazil |
title_fullStr |
Distribution and Growth Morphology of the Recent Microbialites: the Case of Lagoa Salgada, Rio de Janeiro - Brazil |
title_full_unstemmed |
Distribution and Growth Morphology of the Recent Microbialites: the Case of Lagoa Salgada, Rio de Janeiro - Brazil |
title_sort |
Distribution and Growth Morphology of the Recent Microbialites: the Case of Lagoa Salgada, Rio de Janeiro - Brazil |
author |
Silva, Douglas Rosa da |
author_facet |
Silva, Douglas Rosa da Mansur, Kátia Leite Almeida, Leonardo Fonseca Borghi de |
author_role |
author |
author2 |
Mansur, Kátia Leite Almeida, Leonardo Fonseca Borghi de |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Silva, Douglas Rosa da Mansur, Kátia Leite Almeida, Leonardo Fonseca Borghi de |
dc.subject.none.fl_str_mv |
|
dc.subject.por.fl_str_mv |
robial mats; Recent stromatolite |
topic |
robial mats; Recent stromatolite |
description |
Organosedimentary deposits formed by interaction of carbonate and terrigenous sediments are commonly found in the Lagoa Salgada, a holocenic environment located on the north of Rio de Janeiro state which records environmental and biological information of their evolution. Microbial mats are widespread however stromatolites are very prominent and exposed nowadays in the lagoon. Microbial mats were distinguished into two main morphologies, colloform and polygonal mats. It is interesting to note that the colloform ones are not lithified unlike the polygonal ones. Related to stromatolites three main morphologies were defined and classified based on their external morphology and internal structure. Internal structure was further analyzed by sample cutting and thin section study to confirm field classification. Stromatolites are mostly bioherms dome-like and vary from 10 to 40cm high. Morphologically stromatolites are columnar or branched to columnar and coalescence among them are very common resulting in stratiform morphologies. Stromatolitic domal-like bioherms though showing similar internal structure were separated in small and large according to their size; the differences in size are clearly observed and have different areal distribution, which possibly reflects changes in the lagoon paleogeography during the geological time. Also, the identification of differences in the internal structure of stromatolites allows the formulation of hypothesis supporting environmental changes in the Lagoa Salgada. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-12-01 |
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/30642 10.11137/2019_1_439_453 |
url |
https://revistas.ufrj.br/index.php/aigeo/article/view/30642 |
identifier_str_mv |
10.11137/2019_1_439_453 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://revistas.ufrj.br/index.php/aigeo/article/view/30642/17326 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2019 Anuário do Instituto de Geociências http://creativecommons.org/licenses/by/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2019 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 42, No 1 (2019); 439-453 Anuário do Instituto de Geociências; Vol 42, No 1 (2019); 439-453 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_ |
1797053542322667520 |