Cenozoic tectonics of the Fonseca Basin Region, eastern Quadrilátero Ferrífero, MG, Brazil

Sant’anna, Lucy Gomes; Schorscher, H.D.; Riccomini, Claudio

doi:10.1016/s0895-9811(97)00016-3

Cited by 40 publications

(31 citation statements)

References 8 publications

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“…1650-1700m (profiles 1 and 2) in the Serra do Caraça Range. A step in the Chapada de Canga Plateau between 900 and 850m (profile 3) is related to a E-W normal fault with south block down; this fault can also be seen as an anomaly in orientation of isobase lines, as pointed out in previous works (Sant 'Anna, 1994;Sant'Anna et al, 1997).…”

Section: Discussionsupporting

confidence: 54%

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Morphometric analysis in Geographic Information Systems: applications of free software GRASS and R

Grohmann¹

2017

Preprint

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Development and interpretation of morphometric maps are important tools in studies related to neotectonics and geomorphology; Geographic Information Systems (GIS) allows speed and precision to this process, but applied methodology will vary according to available tools and degree of knowledge of each researcher about involved software.A methodology to integrate GIS and statistics in morphometric analysis is presented for the most usual morphometric parameters -hypsometry, slope, aspect, swath profiles, lineaments and drainage density, surface roughness, isobase and hydraulic gradient.The GIS used was the Geographic Resources Analysis Support System (GRASS-GIS), an opensource project that offers an integrated environment for raster and vector analysis, image processing and maps/graphics creation. Statistical analysis of parameters can be carried out on R, a system for statistical computation and graphics, through an interface with GRASS that allows raster maps and points files to be treated as variables for analysis.The basic element for deriving morphometric maps is the digital elevation model (DEM). It can be interpolated from scattered points or contours, either in raster or vector format; it is also possible to use DEMs from NASA's Shuttle Radar Topographic Mission, with 30m of ground resolution for the USA and 90m for other countries.Proposed methodology can be adapted according to necessities and available tools. The use of free and open-source tools guarantees access to everyone, and its increasing popularization opens new development perspectives in this research field.

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Section: Discussionsupporting

confidence: 54%

“…Cenozoic deposits are cut by NE and NW brittle faults and joints, related to reactivation of pre-existing structures in Precambrian basement, process that strongly influenced the development of present day landscape morphology and drainage network (Sant'Anna et al, 1997).…”

Section: Geological and Geomorphological Contextmentioning

confidence: 99%

Morphometric analysis in Geographic Information Systems: applications of free software GRASS and R

Grohmann¹

2017

Preprint

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“…Lipsky (2002) presents many evidences of Cenozoic tectonic movement around this domain, like opening and closing of Tertiary sedimentary basins, and deformation process of its sediments. Sant'Anna et al (1997) highlight that the Fonseca Formation (Eocene) has underwent brittle deformations, as evidenced by post-sedimentary normal faults. The probably Quaternary Chapada de Canga Formation, directly overlied both the Fonseca Formation and the Precambrian basement in angular unconformity, is cut by clastic dykes and fractures (brittle faults and joints) indicating, respectively, syn-and post-sedimentary tectonics.…”

Section: Study Area Descriptionmentioning

confidence: 87%

“…However, the opening of South Atlantic Ocean and the WNW migration of South-American Plate cause an intraplate transfer of tectonic efforts, forcing the reactivation of old faults (NW-SE and NE-SW) and the generation of recent ones (E-W) (Hasui, 1990;Saadi, 1993;Saadi et al, 2005). Because of this, several studies have identified Cenozoic tectonic forcing in the Quadrilátero Ferrífero region (Saadi, 1991;Magalhães Júnior and Saadi, 1994;Sant'Anna et al, 1997;Lipsky, 2002;Salgado et al, 2007;Varajão et al, 2009;Lana and Castro, 2010).…”

Section: Introductionmentioning

confidence: 99%

OSL dating of sediments from a mountainous river in southeastern Brazil: Late Cenozoic tectonic and climatic implications

et al. 2011

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“…Fonte: dados geológicos de CPRM (2005) A região apresenta importante atividade tectônica cenozoica, muito relacionada à rica matriz estrutural herdada do Pré-Cambriano. Vários indícios e evidências de movimentação tectônica cenozoica são observados na região (SAADI, 1991;MAGALHÃES JR. e SAADI, 1994;MARQUES, 1997;SANT'ANNA et al, 1997;LIPSKI, 2002;FIGUEIREDO et al, 2004;BACELLAR et al, 2005;MEDINA et al, 2005;CAMPOS, 2006;SALGADO et al, 2007;VARAJÃO et al, 2009;LANA e CASTRO, 2010;MAGALHÃES JR. et al, 2011;BARROS e MAGALHÃES JR., 2013). Trata-se da formação e fechamento de pequenas bacias de sedimentação colúvio-aluvial cenozoicas, bem como da deformação de seus depósitos, basculamentos, além de diversas evidências de uma intensa dissecação do relevo.…”

Section: A áRea De Estudounclassified

Morfogênese No Quadrilátero Ferrífero/Mg No Quaternário Superior: Processos Fluviais E Condicionantes Paleoambientais Na Bacia Do Rio Das Velhas

Barros¹,

Magalhães²

2018

Rev. Bras. Geomorfol.

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Resumo:Visando aprofundar a compreensão da geomorfologia regional, diversos levantamentos de níveis e sucessões deposicionais fl uviais foram empreendidos no Quadrilátero Ferrífero nas últimas décadas. Entretanto, faltam estudos mais regionalizados, que analisem mais de um vale fl uvial. A partir de novos dados e da releitura em campo da literatura sobre o tema na área de estudo, este trabalho discute o quadro de níveis e sucessões deposicionais fl uviais da bacia do alto Rio das Velhas, que compreende a drenagem da área core do Quadrilátero Ferrífero. Os resultados revelam um relevo dinâmico, sensível às forças tectônicas e variações climáticas do Quaternário Superior. Os níveis deposicionais fl uviais foram datados entre 84-1 Ka por Luminescência Opticamente Estimulada (LOE), permitindo a releitura de dados anteriores e a correlação de depósitos em fases de evolução do sistema fl uvial do alto Rio das Velhas. Esses níveis são, em sua maioria, dos tipos escalonado e pareado e, portanto, confi guram-se como importantes marcadores dos ritmos da tectônica quaternária na região. Destaca-se o encaixamento de alguns cursos d'água ainda no Holoceno Superior. As datações permitem a associação de diferentes níveis fl uviais com oscilações climáticas, que deixaram como registros couraças ferruginosas desenvolvidas sob um clima mais seco/frio que o atual, bem como o embutimento de planícies de inundação em níveis mais antigos, desenvolvidos durante o último máximo glacial. Informações sobre o Artigo

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Cenozoic tectonics of the Fonseca Basin Region, eastern Quadrilátero Ferrífero, MG, Brazil

Cited by 40 publications

References 8 publications

Morphometric analysis in Geographic Information Systems: applications of free software GRASS and R

Morphometric analysis in Geographic Information Systems: applications of free software GRASS and R

OSL dating of sediments from a mountainous river in southeastern Brazil: Late Cenozoic tectonic and climatic implications

Morfogênese No Quadrilátero Ferrífero/Mg No Quaternário Superior: Processos Fluviais E Condicionantes Paleoambientais Na Bacia Do Rio Das Velhas

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