@Article{HayakawaRoss:2015:LaQuDy,
author = "Hayakawa, Ericson Hideki and Rossetti, Dilce de F{\'a}tima",
affiliation = "{} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Late quaternary dynamics in the Madeira river basin, southern
Amazonia (Brazil), as revealed by paleomorphological analysis",
journal = "Anais da Academia Brasileira de Ci{\^e}ncias",
year = "2015",
volume = "87",
number = "1",
pages = "29--49",
keywords = "paleochannels, Amazon Basin, Madeira river, remote sensing,
climate, tectonics.",
abstract = "Ancient drainage systems are being increasingly documented in the
Amazon basin and their characterization is crucial for
reconstructing fluvial evolution in this area. Fluvial
morphologies, including elongate belts, are well preserved along
the Madeira River. Digital Elevation Model from the Shuttle Radar
Topography Mission favored the detection of these features even
where they are covered by dense rainforest. These
paleomorphologies are attributed to the shifting position of past
tributaries of the Madeira River through avulsions. These radial
paleodrainage networks produced fan-shaped morphologies that
resemble distributary megafans. Distinguishing avulsive tributary
systems from distributary megafans in the sedimentary record is
challenging. Madeira´s paleodrainage reveals the superposition of
tributary channels formed by multiple avulsions within a given
time period, rather than downstream bifurcation of coexisting
channels. Channel avulsion in this Amazonian area during the late
Quaternary is related to tectonics due to features as: (i)
straight lineaments coincident with fault directions; (ii)
northeastward tilting of the terrain with Quaternary strata; and
(iii) several drainage anomalies, including frequent orthogonal
drainage inflections. These characteristics altogether lead to
propose that the radial paleodrainage present at the Madeira River
margin results from successive avulsions of tributary channels
over time due to tectonics.",
doi = "10.1590/0001-3765201520130506",
url = "http://dx.doi.org/10.1590/0001-3765201520130506",
issn = "0001-3765",
language = "en",
urlaccessdate = "05 jun. 2024"
}