Artigo

The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema beach, Pará State, Amazon region, during the last millennium

Five sedimentary cores were collected on the ancient sedimentary clay deposits of Itupanema Beach, Barcarena town, Pará State, Amazon region, where diatom analysis was performed to infer the history of the paleoecological and paleohydrological changes during the last millennium. The results revealed...

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Autor principal: Ribeiro, Fábio Campos Pamplona
Outros Autores: Senna, Cristina do Socorro Fernandes de, Torgan, Lezilda Carvalho
Grau: Artigo
Idioma: English
Publicado em: Sociedade Brasileira de Paleontologia 2011
Assuntos:
Diatoms
Taxonomy
Tidal plain
Estuairies
Amazon
Diatomáceas
Taxonomia
Planície de maré
Estuário
Amazônia
Acesso em linha: http://repositorio.museu-goeldi.br/handle/mgoeldi/367
id ir-mgoeldi-367
recordtype dspace
spelling ir-mgoeldi-3672019-07-17T17:59:50Z The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema beach, Pará State, Amazon region, during the last millennium Ribeiro, Fábio Campos Pamplona Senna, Cristina do Socorro Fernandes de Torgan, Lezilda Carvalho Diatoms Taxonomy Tidal plain Estuairies Amazon Diatomáceas Taxonomia Planície de maré Estuário Amazônia Five sedimentary cores were collected on the ancient sedimentary clay deposits of Itupanema Beach, Barcarena town, Pará State, Amazon region, where diatom analysis was performed to infer the history of the paleoecological and paleohydrological changes during the last millennium. The results revealed 58 diatoms species among benthic and planktonic life forms. Correspondence analysis applied to relative abundance of diatoms and associated with sedimentary texture, OM contents and 14C dating, defined three ecozones. The lower sandy ecozone 1 dated at 930 ± 40 14C yr BP (Beta 217590) was dominated by the benthic/epipsammic species Staurosira obtusa, Staurosirella pinnata and Staurosirella crassa (nov. comb.), that indicated more hydrodynamic energy than in present days, originating a shallow sedimentary environment, under erosive conditions, unfavorable to the colonization of vegetation. The intermediate grey clay ecozone 2 that was observed only in the IT1 core, dated at 520 ± 40 14C yr BP (Beta 217591) showed the prevalence of planktonic diatoms, providing evidence of a deeper and calmer environment, located in a probably protected area, with intense sedimentation of clay particles with abundant plant remains, colonized by mangrove forest and alluvial palm forest. The upper organic-clay to organic-sand ecozone 3 much younger than 520 ± 40 14C yr BP, showed more agitated and erosive sedimentary conditions, however, with less energy than that in lower ecozones, indicated by higher abundance of A. granulata, strongly silicified. This new sedimentary environment allowed colonization by aquatic macrophyte vegetation which persists on the beach today 2011-03-29T15:37:04Z 2011-03-29T15:37:04Z 2010-01 artigo RIBEIRO, Fábio Campos Pamplona; SENNA. Cristina do Socorro Fernandes de ; TORGAN, Lezilda Carvalho. The use of diatoms for paleohydrological and paleoenvironmetal reconstructions of Itupanema Beach, Pará State, Amazon Region, during the last millennium. Revista Brasileira de Paleontologia, v. 13. N. 1. P.21-32, jan./abr.2010. doi: 10.4072/rbp.2010.1.03. 1519-7530 http://repositorio.museu-goeldi.br/handle/mgoeldi/367 en application/pdf Sociedade Brasileira de Paleontologia
institution Repositório Institucional - Museu Paraense Emílio Goeldi
collection RepositorioEmilioGoeldi
language English
topic Diatoms
Taxonomy
Tidal plain
Estuairies
Amazon
Diatomáceas
Taxonomia
Planície de maré
Estuário
Amazônia
spellingShingle Diatoms
Taxonomy
Tidal plain
Estuairies
Amazon
Diatomáceas
Taxonomia
Planície de maré
Estuário
Amazônia
Ribeiro, Fábio Campos Pamplona
The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema beach, Pará State, Amazon region, during the last millennium
topic_facet Diatoms
Taxonomy
Tidal plain
Estuairies
Amazon
Diatomáceas
Taxonomia
Planície de maré
Estuário
Amazônia
description Five sedimentary cores were collected on the ancient sedimentary clay deposits of Itupanema Beach, Barcarena town, Pará State, Amazon region, where diatom analysis was performed to infer the history of the paleoecological and paleohydrological changes during the last millennium. The results revealed 58 diatoms species among benthic and planktonic life forms. Correspondence analysis applied to relative abundance of diatoms and associated with sedimentary texture, OM contents and 14C dating, defined three ecozones. The lower sandy ecozone 1 dated at 930 ± 40 14C yr BP (Beta 217590) was dominated by the benthic/epipsammic species Staurosira obtusa, Staurosirella pinnata and Staurosirella crassa (nov. comb.), that indicated more hydrodynamic energy than in present days, originating a shallow sedimentary environment, under erosive conditions, unfavorable to the colonization of vegetation. The intermediate grey clay ecozone 2 that was observed only in the IT1 core, dated at 520 ± 40 14C yr BP (Beta 217591) showed the prevalence of planktonic diatoms, providing evidence of a deeper and calmer environment, located in a probably protected area, with intense sedimentation of clay particles with abundant plant remains, colonized by mangrove forest and alluvial palm forest. The upper organic-clay to organic-sand ecozone 3 much younger than 520 ± 40 14C yr BP, showed more agitated and erosive sedimentary conditions, however, with less energy than that in lower ecozones, indicated by higher abundance of A. granulata, strongly silicified. This new sedimentary environment allowed colonization by aquatic macrophyte vegetation which persists on the beach today
format Artigo
author Ribeiro, Fábio Campos Pamplona
author2 Senna, Cristina do Socorro Fernandes de
Torgan, Lezilda Carvalho
author2Str Senna, Cristina do Socorro Fernandes de
Torgan, Lezilda Carvalho
title The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema beach, Pará State, Amazon region, during the last millennium
title_short The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema beach, Pará State, Amazon region, during the last millennium
title_full The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema beach, Pará State, Amazon region, during the last millennium
title_fullStr The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema beach, Pará State, Amazon region, during the last millennium
title_full_unstemmed The use of diatoms for paleohydrological and paleoenvironmental reconstructions of Itupanema beach, Pará State, Amazon region, during the last millennium
title_sort use of diatoms for paleohydrological and paleoenvironmental reconstructions of itupanema beach, pará state, amazon region, during the last millennium
publisher Sociedade Brasileira de Paleontologia
publishDate 2011
url http://repositorio.museu-goeldi.br/handle/mgoeldi/367
_version_ 1787135765188182016
score 11.653393

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