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• W2902673958 endingPage "118" @default.
• W2902673958 startingPage "81" @default.
• W2902673958 abstract "Lacking evidence for fluvial lateral-accretion elements in early Palaeozoic systems has been ascribed to an absence of binding by rooted vegetation on subaerial landscapes. Transposing this thesis to earlier geological times, it has been proposed that, likewise, Precambrian landscapes could not have sustained highly sinuous fluvial networks. This paradigm has been hardly ever tested for the Proterozoic, a shortcoming addressed here through review of selected outcrop data and remote sensing of modern sinuous channel-flow configurations. Five sedimentary rock units deposited on Laurentia between 1.6 to 0.7 Ga record diverse palaeogeographic and tectonic settings and yield evidence of lateral accretion and planform sinuosity in fluvial channels over a full range of developmental stages. In the absence of vegetation, multiple processes interacted at craton to channel-reach scales, setting conditions favourable for self-sustained lateral accretion and thus sinuosity. Discharge modulation in perennial channels is interpreted to have had an overriding role, owing to craton-scale catchments capable of sustaining year-round flows or favourable climate settings. Steady sediment supply and local channel-bank strengthening limited braiding, allowing for narrow hydraulic profiles with flow configurations favourable to lateral accretion. Less than 15% of current literature on Proterozoic fluvial rocks reports reliable directional data on palaeoflows and stratal accretion, a bias that undermines literature compilations aimed at gauging the relevance or insignificance of pre-vegetation lateral accretion. Fluvial deposits aggraded on unvegetated landmasses prior to the late Ordovician can only be assessed when comprehensive information on palaeoflow and bar accretion becomes available. The authors thus underline that a lack of evidence for early Palaeozoic lateral-accretion sets should not be used to support the inference that meandering fluvial planforms were a rare occurrence in earlier geological times." @default.
• W2902673958 created "2018-12-11" @default.
• W2902673958 creator A5025590022 @default.
• W2902673958 creator A5033126479 @default.
• W2902673958 creator A5066108842 @default.
• W2902673958 creator A5078224560 @default.
• W2902673958 date "2018-11-26" @default.
• W2902673958 modified "2023-10-14" @default.
• W2902673958 title "Planform sinuosity of Proterozoic rivers" @default.
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