The ancestors of meandering rivers.
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2016
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Modern alluvial plains, in contrast to their pre-Silurian counterparts, are characterized
by the presence of meandering rivers in low-downstream-gradient areas, constituting efficient
transport systems that maintain high bottom shear stresses in deep channels, which are made
possible by bank stabilization, most commonly provided by vegetation in Earth’s recent history.
Here we show, through numerical modeling and field-based description of large-scale
exposures in Mesoproterozoic successions, that prevegetation rivers in low-downstream-gradient
areas were markedly different from both younger meandering rivers and the common
prevegetation sheet-braided rivers, showing deeper braided channels and greater floodplain
preservation than the latter. These systems were less frequent and had lower transport efficiency
than modern meandering rivers, implying differences in global-scale Earth-surface
dynamics, from the weathering of silicate minerals in floodplains to the grain size distribution
in all clastic depositional systems.
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ALMEIDA, R. P. de et al. The ancestors of meandering rivers. Geology, Boulder Colo, v. 44, p. 203-206, 2016. Disponível em: <https://pubs.geoscienceworld.org/geology/article-abstract/44/3/203/132025/the-ancestors-of-meandering-rivers?redirectedFrom=fulltext>. Acesso em: 25 ago. 2017.