Impact of tectonic topographic rejuvenation in landscapes with high bedrock/duricrust strength: Insights from geomorphic evidence in a post-rifted region (SE Brazil)

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dc.contributor.authorCampos, Daniela Schievano de
dc.contributor.authorSantos, Marcilene dos [UNESP]
dc.contributor.authorMarques, Karina P.P.
dc.contributor.authorSilva, Alexandre Christófaro
dc.contributor.authorVidal-Torrado, Pablo
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionFederal University of Jequitinhonha and Mucuri Valleys
dc.date.accessioned2023-07-29T13:56:52Z
dc.date.available2023-07-29T13:56:52Z
dc.date.issued2023-08-15
dc.description.abstractThe evolution of Cenozoic relief in post-rifted and post-orogenic landscapes reveals enigmatic and intricate dynamics. Unsteady conditions long after the cessation of ongoing tectonics have been reported in these landscapes with evidence for relief growth rather than the expected slow topographic decay. Various controlling factors (e.g., lithology and isostasy) have been invoked to explain their geomorphic evolution; however, topographic rejuvenation controls remain puzzling, particularly within intraplate landscapes. Here, we investigated topographic rejuvenation, exploring the interactions between the river long profiles of the drainage network, the broader landscape topography, and their collective relationships with the strength of the bedrock and duricrust soils that cap the land surface in the Southern Espinhaço Range of Brazil. This is a humid tropical post-orogenic and post-rifted landscape characterised by resistant bedrock and duricrusts, despite some rock-type strength variability. We show robust evidence for a first-order control exerted by the lithology/rock strength. However, results revealed an overall non-collinearity between the transformed river profiles. These profiles displayed knickpoints separating upstream low-relief uplands capped by Fe/Al duricrusts from an incised downstream transient landscape associated with uplift/base-level fall. Regionally, the river profiles display an asymmetric pattern of relief growth with an eastward gain in elevation and fault-controlled dismantling of duricrusted surface that cannot be explained exclusively by bedrock strength variations. This spatial configuration suggests that links exist between the internal and external factors that collectively control the landscape development. The interplay between faulting/dismantling of the duricrusts and river incision/topographic patterns provides compelling evidence for Pliocene tectonic/topographic rejuvenation. Our findings are consistent with a pattern of regional surface uplift related to combined flexural isostasy and far-field stress interactions. Collectively, our study demonstrates that lithology, as a first control factor on topographic rejuvenation, is not exclusive to post-orogenic landscapes with strongly heterogeneous bedrock. The bedrock/duricrust strength acts in combination with locally inherited discontinuities and large-scale tectonics/flexural isostasy. Such interactions add significant complexity to the evolution and rejuvenation of post-rifted landscapes, particularly within intraplate settings.en
dc.description.affiliation“Luiz de Queiroz” College of Agriculture University of São Paulo, Av. Pádua Dias, 11, São Paulo
dc.description.affiliationUNESP - São Paulo State University School of Sciences Technology and Education, Campus Ourinhos, Av. Renato da Costa Lima, 451, São Paulo
dc.description.affiliationFederal University of Jequitinhonha and Mucuri Valleys, JK Campus, Rodovia MGT 367 - Km 583, 5000, Minas Gerais
dc.description.affiliationUnespUNESP - São Paulo State University School of Sciences Technology and Education, Campus Ourinhos, Av. Renato da Costa Lima, 451, São Paulo
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCNPq: 140833/2018-8
dc.description.sponsorshipIdFAPESP: 2014/09202-8
dc.description.sponsorshipIdFAPESP: 2017/22292-4
dc.description.sponsorshipIdFAPESP: 2019/10708-7
dc.description.sponsorshipIdCNPq: 301818/2017-7
dc.description.sponsorshipIdCNPq: 408138/2016-5
dc.identifierhttp://dx.doi.org/10.1016/j.geomorph.2023.108749
dc.identifier.citationGeomorphology, v. 435.
dc.identifier.doi10.1016/j.geomorph.2023.108749
dc.identifier.issn0169-555X
dc.identifier.scopus2-s2.0-85160453892
dc.identifier.urihttp://hdl.handle.net/11449/248902
dc.language.isoeng
dc.relation.ispartofGeomorphology
dc.sourceScopus
dc.subjectDuricrust
dc.subjectPost-orogenic landscape
dc.subjectRock strength
dc.subjectTropical highland
dc.titleImpact of tectonic topographic rejuvenation in landscapes with high bedrock/duricrust strength: Insights from geomorphic evidence in a post-rifted region (SE Brazil)en
dc.typeArtigo

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