Artigo

Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia

Down-core changes in sedimentary facies, elemental geochemistry, pollen, spore, δ13C, δ15N and radiocarbon records from a filled lake, named R4, of the Serra Sul dos Carajás were used to study the relationship between the paleomorphological and paleoecological processes and their significance for Ho...

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Autor principal: GUIMARÃES, José Tasso Felix
Outros Autores: SAHOO, Prafulla Kumar, SOUZA FILHO, Pedro Walfir Martins e, FIGUEIREDO, Mariana Maha Jana Costa de, REIS, Luiza Santos, RODRIGUES, Tarcísio Magevski, SILVA, Marcio da Silva
Grau: Artigo
Idioma: eng
Publicado em: Academia Brasileira de Ciências 2019
Assuntos:
Amazon Forest
Canga vegetation
Palynology
Carbon and nitrogen isotopes
Geochemistry
Acesso em linha: http://repositorio.ufpa.br/jspui/handle/2011/10864
http://dx.doi.org/10.1590/0001-3765201720160916
id ir-2011-10864
recordtype dspace
spelling ir-2011-108642019-11-01T13:19:49Z Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia GUIMARÃES, José Tasso Felix SAHOO, Prafulla Kumar SOUZA FILHO, Pedro Walfir Martins e FIGUEIREDO, Mariana Maha Jana Costa de REIS, Luiza Santos RODRIGUES, Tarcísio Magevski SILVA, Marcio da Silva Amazon Forest Canga vegetation Palynology Carbon and nitrogen isotopes Geochemistry Down-core changes in sedimentary facies, elemental geochemistry, pollen, spore, δ13C, δ15N and radiocarbon records from a filled lake, named R4, of the Serra Sul dos Carajás were used to study the relationship between the paleomorphological and paleoecological processes and their significance for Holocene paleoclimatology of the southeast Amazonia. The sediment deposition of the R4 lake started around 9500 cal yr BP. Increase of detrital components from 9500 to 7000 cal yr BP suggests high weathering of surrounding catchment rocks and soils, and deposition into the lake basin under mudflows. At that time, montane savanna and forest formation were already established suggesting predominance of wet climate. However, from 7000 to 3000 cal yr BP, a decline of detrital input occurred. Also, forest formation and pteridophytes were declined, while palms and macrophytes were remained relatively stable, indicating that water levels of the lake is likely dropped allowing the development of plants adapted to subaerial condition under drier climate conditions. After 3000 cal yr BP, eutrophication and low accommodation space lead to high lake productivity and the final stage of the lake filling respectively, and forest formation may has acquired its current structure, which suggests return of wetter climate conditions. SOUZA FILHO, P. W. M. Universidade Federal do Pará 2019-04-03T17:46:03Z 2019-04-03T17:46:03Z 2017-08-24 Artigo de Periódico GUIMARÃES, José Tasso Felix et al. Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia. Anais da Academia Brasileira de Ciências, Rio de Janeiro, v. 91, supl. 2, 2019. Disponível em: http://repositorio.ufpa.br/jspui/handle/2011/10864. Acesso em:. 1678-2690 http://repositorio.ufpa.br/jspui/handle/2011/10864 http://dx.doi.org/10.1590/0001-3765201720160916 eng Anais da Academia Brasileira de Ciências Acesso Aberto application/pdf Academia Brasileira de Ciências Brasil ABC http://ref.scielo.org/6zvn6w
institution Repositório Institucional - Universidade Federal do Pará
collection RI-UFPA
language eng
topic Amazon Forest
Canga vegetation
Palynology
Carbon and nitrogen isotopes
Geochemistry
spellingShingle Amazon Forest
Canga vegetation
Palynology
Carbon and nitrogen isotopes
Geochemistry
GUIMARÃES, José Tasso Felix
Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia
topic_facet Amazon Forest
Canga vegetation
Palynology
Carbon and nitrogen isotopes
Geochemistry
description Down-core changes in sedimentary facies, elemental geochemistry, pollen, spore, δ13C, δ15N and radiocarbon records from a filled lake, named R4, of the Serra Sul dos Carajás were used to study the relationship between the paleomorphological and paleoecological processes and their significance for Holocene paleoclimatology of the southeast Amazonia. The sediment deposition of the R4 lake started around 9500 cal yr BP. Increase of detrital components from 9500 to 7000 cal yr BP suggests high weathering of surrounding catchment rocks and soils, and deposition into the lake basin under mudflows. At that time, montane savanna and forest formation were already established suggesting predominance of wet climate. However, from 7000 to 3000 cal yr BP, a decline of detrital input occurred. Also, forest formation and pteridophytes were declined, while palms and macrophytes were remained relatively stable, indicating that water levels of the lake is likely dropped allowing the development of plants adapted to subaerial condition under drier climate conditions. After 3000 cal yr BP, eutrophication and low accommodation space lead to high lake productivity and the final stage of the lake filling respectively, and forest formation may has acquired its current structure, which suggests return of wetter climate conditions.
format Artigo
author GUIMARÃES, José Tasso Felix
author2 SAHOO, Prafulla Kumar
SOUZA FILHO, Pedro Walfir Martins e
FIGUEIREDO, Mariana Maha Jana Costa de
REIS, Luiza Santos
RODRIGUES, Tarcísio Magevski
SILVA, Marcio da Silva
author2Str SAHOO, Prafulla Kumar
SOUZA FILHO, Pedro Walfir Martins e
FIGUEIREDO, Mariana Maha Jana Costa de
REIS, Luiza Santos
RODRIGUES, Tarcísio Magevski
SILVA, Marcio da Silva
title Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia
title_short Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia
title_full Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia
title_fullStr Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia
title_full_unstemmed Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia
title_sort holocene history of a lake filling and vegetation dynamics of the serra sul dos carajás, southeast amazonia
publisher Academia Brasileira de Ciências
publishDate 2019
url http://repositorio.ufpa.br/jspui/handle/2011/10864
http://dx.doi.org/10.1590/0001-3765201720160916
_version_ 1832605140799979520
score 11.755432

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