Ambientes sedimentares da planície aluvial do rio Araguaia
Carregando...
Data
2014-06
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
The middle course of the Araguaia River is an anabraching channel with tendency
to braided, showing mobile and unstable landforms due to sandy excessive load.
This paper presents a classifi cation of sedimentary environments and the recent lateral migration processes in the channel of the middle course of the Araguaia River. Results were based on the
association of sedimentary facies from deposits contained in the alluvial plain, by analysis the sediment profi les from
river margin, perforation samples and undeformed records. This paper identifi ed two sedimentary sub-environments
associated to fl oodplain (plain fl ooded occasionally and swamps) and fi ve sub-environments associated to the main
channel (main channel, secondary channels, lateral bars, central bars and islands and levees). It also recognized
erosional and depositional processes that promote the channel migration of the middle course of the Araguaia.
Depositional processes are based at stabilization of middle channel bars, increase of the size of the islands and
sedimentation within the main channel. Results show the response of the fl uvial system and evolution of channel
of the Araguaia from increase transported load.
Descrição
Palavras-chave
Associação de fácies sedimentar, Reprocessing, Reconstrução paleoambiental, Migração fluvial recente, Morfometry of drainage basin, Litho structure, Relief morphology, Drainage basin evolution
Citação
BAYER, Maximiliano; Zancopé, Márcio Henrique de Campos. Ambientes sedimentares da planície aluvial do rio Araguaia. Revista Brasileira de Geomorfologia, Curitiba, v. 15, n. 2, p. 203-220, 2014.