Neotectonics, River Capture and Landscape Evolution in the Highlands of Se Brazil

Lavarini, Chrystiann; Magalhães, Antônio Pereira; Oliveira, Fábio Soares de; Carvalho, Alex de

doi:10.4215/rm2016.1504.0007

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…The preferred ancestral habitat of Hypostomus is very common in river headwaters, which are portions of drainages prone to be captured by adjacent basins through evolutionary time. Indeed, the geomorphological history of South America has been marked by many events of headwater captures (James S. Albert et al, 2018;Lavarini, Magalhães Júnior, Oliveira, & Carvalho, 2016;Stokes, Goldberg, & Perron, 2018), their incidence being increased by the active tectonics of this continent and by river meandering and erosion in relatively flat relief in several watershed divides.…”

Section: The Role Of Ecology In Hypostomus Dispersalmentioning

confidence: 99%

Western Amazon was a center of Neotropical fish dispersal, as evidenced by the continental-wide time-stratified biogeographic analysis of the hyper-diverseHypostomuscatfish

Meyer

et al. 2021

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The Amazon is probably the most diverse realm on Earth, and is considered to be the primary source of diversity and a center of dispersal for Neotropical terrestrial organisms. Yet, the assumption that the Amazon basin is a primordial place of fish species origination and dispersal into other drainages still need to be tested. We addressed this issue by inferring a time-stratified biogeographic history and reconstructing the ancestral habitat preference of Hypostomus, a continentally widespread and species-rich Neotropical genus. We found that Hypostomus emerged in the Western Amazon (~14.7 Ma), when the Western Amazon River was flowing northwards and disconnected from the Eastern Amazon. We show that dispersal events in the first half of Hypostomus evolution occurred from the Western Amazon into adjacent basins, initiating its Neotropical radiation. The ancestral preferred habitat consisted in small rivers with running waters, a predominant habitat in river headwaters. Because of strong niche conservatism in the early evolution of Hypostomus, we suggest that most of the out-of-Western-Amazon dispersal occurred via headwater captures. The radiation of Hypostomus was further promoted by major reconfigurations of river basins, which opened dispersal opportunities into new drainages. Diversification in habitat preference coincided with colonization of basins already occupied by congenerics, indicative of niche shifts triggered by inter-specific competition and species coexistence. By analyzing the evolutionary history of Hypostomus, we show that Western Amazon was the main center of fish dispersal in the Neotropical Region from Middle Miocene to the present, supporting the cradle hypothesis of fish origination and dispersal.

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Section: The Role Of Ecology In Hypostomus Dispersalmentioning

confidence: 99%

Western Amazon was a center of Neotropical fish dispersal, as evidenced by the continental-wide time-stratified biogeographic analysis of the hyper-diverseHypostomuscatfish

Meyer

et al. 2021

Preprint

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“…Particularmente, em Minas Gerais, os estudos abordam principalmente vales fl uviais de contextos geológico-geomorfológicos serranos, especialmente o Quadrilátero Ferrífero, a Serra do Espinhaço e a Serra da Mantiqueira (VALADÃO e SILVEIRA, 1992;MA-GALHÃES JR, 1993;MAGALHÃES JR e SAADI, 1994;MOREIRA, 1997;MARQUES, 1997;LANA, 2004;BACELLAR et al, 2005;MAGALHÃES JR. et al, 2011a;MAGALHÃES JR. et al, 2011b;BARROS e MAGALHÃES JR., 2013;MESSIAS e MAGALHÃES JR., 2014;OLIVEIRA et al, 2014;LAVARINI et al, 2016;CARVALHO et al, 2018). Por sua vez, a porção central do estado, especialmente a região do Cráton do São Francisco, constitui-se em uma área com escassos estudos geomorfológicos.…”

Section: Introductionunclassified

Eventos Quaternários De Entulhamento E Configuração De Fundos De Vale Na Bacia Do Rio Paraopeba – Cráton Do São Francisco, Sudeste Do Brasil

Carvalho¹,

Magalhães²,

Oliveira³

2020

Rev. Bras. Geomorfol.

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Neste artigo, buscou-se reconstituir os eventos quaternários de entulhamento sedimentar e a consequente configuração morfogenética de fundos de vales na bacia do rio Paraopeba, Cráton do São Francisco, Minas Gerais. Foram investigados os processos morfogenéticos e o contexto geomorfológico relacionados à formação, arranjo espacial e evolução dos espessos depósitos de sedimentos fluviais presentes nos fundos dos vales fluviais de afluentes do Médio e Baixo rio Paraopeba, MG. Na maior parte dos vales analisados, foram encontrados até três níveis deposicionais fluviais: a planície de inundação, um terraço preservado e um nível deposicional alterado pelo coluvionamento (N1, N2 e N3, respectivamente). A partir da análise do arranjo espacial dos níveis deposicionais, da granulometria e da organização das fácies dos depósitos fluviais, propõe-se que ocorreram na região ao menos quatro eventos sedimentares regionais (ESR1, ESR2, ESR3 e ESR4), que podem ser associados ao controle litoestrutural e tectônico. O ESR1 corresponde ao evento mais antigo e é representado pelos depósitos de N3. Esses depósitos apresentam indícios de condições de deposição com maior energia. Os eventos ESR2 e ESR3 são representados pelos N2 dos médios cursos e dos N2 dos baixos cursos dos afluentes da margem direita, respectivamente. O ESR4 está associado à formação dos N1 nos baixos cursos dos vales investigados. Os eventos de sedimentação locais estão associados à formação dos N2 e N1 nos altos cursos dos ribeirões do Ouro e das Lajes e dos N1 nos médios cursos de todos os afluentes, que podem corresponder a eventos deposicionais cronologicamente diferentes. Considerando os níveis deposicionais escalonados, a organização da drenagem e os resultados da análise morfométrica, é possível inferir que o condicionamento tectônico foi responsável por soerguimentos e/ou basculamentos na região. O rico quadro estrutural foi herdado dos ciclos Transamazônico e Brasiliano. Ele é composto por falhas e zonas de cisalhamento que foram reativadas ao longo do tempo geológico e podem favorecer o controle tectônico regional. Por outro lado, o controle litológico tem papel importante na organização dos depósitos fluviais. Os diques básicos e os veios de quartzo exercem são responsáveis pelo estabelecimento de níveis de base locais em alguns trechos dos cursos fluviais e favorecem a preservação de depósitos de N2 em níveis altimétricos distintos. Os dados da datação por LOE sugerem que o ESR2 ocorreu entre 17.600 ± 2.780 e 15.800 ± 2.500 anos AP, o evento de sedimentação dos N2 nos trechos de Alto curso dos ribeirões do Ouro e das Lajes ocorreu 6.250 ± 1.100 e 2.850 ± 420 anos AP e o ESR3 ocorreu entre 2.750 ± 420 e 1.250 ± 190 anos AP.

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“…River basins affected by intense tectonic activity, such as the Ocoa Basin, usually harbor excellent examples of drainage rearrangement (Molin & Fubelli, 2005;Ascione, Cinque, Miccadei, Villani, & Berti, 2008;Lavarini, Magalhães Júnior, Oliveira, & Carvalho, 2016;Antón, De Vicente, Muñoz-Martín, & Stokes, 2014;Piacentini & Miccadei, 2014). Bishop (1995) defined drainage rearrangement as a transfer of part or all of a river's flow to another river, a mechanism that may explain river history at different spatial scales.…”

Section: Introductionmentioning

confidence: 99%

Drainage rearrangement as a driver of geomorphological evolution during the Upper Pleistocene in a small tropical basin

Batlle¹

2019

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The development of river networks in contexts where intense tectonic activity converges with great lithological variability, such as the Ocoa River Basin in the south of the Dominican Republic, usually hosts excellent examples of drainage rearrangement. This mechanism is defined as a transfer of part or all of a river's flow to another river. According to the process involved, drainage rearrangement may be classified in one of four categories: stream capture, river diversion, beheading and, more recently, karst piracy. The Parra River Basin (29.5 square kilometers), part of the Ocoa River Basin, features excellent examples of drainage rearrangement. The aim of this research was to detect and characterize drainage rearrangement evidence in three sub-basins of the Parra River Basin. Several geomorphological features, including striking differences in lithological types of alluvial deposits between terraces and stream beds, a sinkhole in a tributary stream, as well as high variability in basin morphometry computed using GIS techniques, suggest the development of karst piracy during the Upper Pleistocene in the Parra drainage network, along with other minor rearrangement forms. Karst piracy is an understudied model of drainage rearrangement worldwide, and so it is in the Dominican Republic. Hence, this paper contributes to a better understanding of the interaction between rivers and karst systems, at the same time providing new evidence for this little-known phenomenon.

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Neotectonics, River Capture and Landscape Evolution in the Highlands of Se Brazil

Cited by 7 publications

References 14 publications

Western Amazon was a center of Neotropical fish dispersal, as evidenced by the continental-wide time-stratified biogeographic analysis of the hyper-diverseHypostomuscatfish

Western Amazon was a center of Neotropical fish dispersal, as evidenced by the continental-wide time-stratified biogeographic analysis of the hyper-diverseHypostomuscatfish

Eventos Quaternários De Entulhamento E Configuração De Fundos De Vale Na Bacia Do Rio Paraopeba – Cráton Do São Francisco, Sudeste Do Brasil

Drainage rearrangement as a driver of geomorphological evolution during the Upper Pleistocene in a small tropical basin

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