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metadata.dc.type: Artigo de Periódico
Issue Date: 24-Aug-2017
metadata.dc.creator: 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
metadata.dc.description.affiliation: SOUZA FILHO, P. W. M. Universidade Federal do Pará
Title: Holocene history of a lake filling and vegetation dynamics of the Serra Sul dos Carajás, southeast Amazonia
Citation: 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: Acesso em:.
Abstract: 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.
Keywords: Amazon Forest
Canga vegetation
Carbon and nitrogen isotopes
Series/Report no.: Anais da Academia Brasileira de Ciências
ISSN: 1678-2690 Brasil
Publisher: Academia Brasileira de Ciências
metadata.dc.publisher.initials: ABC
metadata.dc.rights: Acesso Aberto
Appears in Collections:Artigos Científicos - IG

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