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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Neogene-Quaternary sedimentary and paleovegetation history of the eastern Solimoes Basin, central Amazon region

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Rodrigues Nogueira, Afonso Cesar [1] ; Silveira, Rosemery [2] ; Felix Guimaraes, Jose Tasso [3]
Total Authors: 3
[1] Fed Univ Para, Programa Posgrad Geol & Geoquim, BR-66075110 Belem, PA - Brazil
[2] Univ Fed Amazonas, Dept Geociencias, BR-69077000 Manaus, Amazonas - Brazil
[3] ITV, BR-66055090 Belem, PA - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of South American Earth Sciences; v. 46, p. 89-99, OCT 2013.
Web of Science Citations: 38

Palynological and stratigraphical analyses were carried out on the outcrops of the Solimoes River to present new information about freshwater paleoenvironments of a fluvial-deltaic and meandering river system, evaluate the vegetation changes in the upper Solimoes and Ica Formations in the eastern Solimoes Basin, and the role of the Purus Arc in the evolution of central Amazon during the upper Neogene. The upper Miocene to Pliocene Solimoes Formation is related to a fluvial-deltaic system, with fine-grained sediments of the prodelta-lacustrine environment supplied by meandering distributaries and delta front environment. The lake and distributaries were surrounded by extensive deltaic and floodplains colonized by lowland freshwater forests under wet climate conditions, persisting until the Pliocene. The Ica Formation started to deposit unconformably on the Solimoes Formation during the Pleistocene, following the development of extensive meandering channels surrounded by floodplains of an essentially fluvial system linked to development of the present eastward direction of the Amazon River until the Atlantic coast. These floodplains were colonized by few palm species and pteridophytes of lowland freshwater forests during the Pleistocene. Additionally, no algae and fungi were observed, which may be related to drier climate conditions and/or different morphological conditions than the upper Solimoes Formation. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 12/50260-6 - Structure and evolution of the Amazonian biota and its environment: an integrative approach
Grantee:Lúcia Garcez Lohmann
Support type: BIOTA-FAPESP Program - Thematic Grants