Detecting neotectonics in the lowlands of Amazonia through the analysis of river long profiles

Geodiversity in the Amazon drainage basin

“…Consequently, the area is dominated by sedimentary deposits (figure 4b) which have a low to very low slope diversity index class. Yet, these hydrogeomorphological studies distinguish several geomorphological units, such as the Viruá and Caracarai megafans (number 39 in figure 1 and table 2), alluvial plains and sedimentary basins, that provide important information regarding the areas' geological history [88,[90][91][92][93]. They also identified tectonic activity as one of the main drivers for the position of current river channels, which in turn shapes fluvial geomorphology [88,[90][91][92][93].…”

“…Yet, these hydrogeomorphological studies distinguish several geomorphological units, such as the Viruá and Caracarai megafans (number 39 in figure 1 and table 2), alluvial plains and sedimentary basins, that provide important information regarding the areas' geological history [88,[90][91][92][93]. They also identified tectonic activity as one of the main drivers for the position of current river channels, which in turn shapes fluvial geomorphology [88,[90][91][92][93]. A unique example of the interaction between geological and hydrological processes is the Anavilhanas Archipelago (number 37 in figure 1 and table 2), the largest freshwater archipelago in the world [88].…”

“…Most geomorphological research in the ADB is conducted within the hydrogeomorphological sphere [88,[90][91][92][93], with the majority of the studies located in the central Amazon. The central Amazon in general has a low geological diversity, which is likely the result of low topography, relatively low sediment input (when compared to the westernmost Amazon) and paired accommodation space [112].…”

Morphostructural influence and neotectonic activity in the geomorphological configuration of southeast Paraíba and northeast Pernambuco, Brazil

“…In addition, morphometric indices are used to investigate the neotectonic activities of faults within basins. These indices serve as fundamental tools to identify tectonic activities [ [7] , [8] , [9] ], beyond the shape of the rivers' longitudinal profiles, erosive concavity processes, tectonic slope based on basin asymmetry indices, and topographic information from scanning profiles [ 10 ]. However, morphometric indices can undergo changes due to tectonic tilting and/or uplift, as well as lithological characteristics, making their interpretation potentially problematic [ 11 ].…”

Análise morfoestrutural da Formação Tupanciretã (Cenozoico), Planalto Meridional do Rio Grande do Sul, Brasil

“…Relevos produzidos por deformações tectônicas durante o Cenozoico têm sido registrados com frequência no Brasil (p.e., Bezerra & Vita-Finzi, 2000, Bezerra et al, 2014Almeida Filho et al, 2009;Cogné et al, 2013;Rossetti et al, 2011;Bricalli & Mello, 2013;Alves et al, 2020), apesar da placa Sulamericana ser considerada já estável nesse período geológico subsequente à separação continental e abertura do Oceano Atlântico no Cretáceo (Almeida, 1967;Szatmari et al, 1987).…”