Reativações neotectônicas na Zona de Cisalhamento do Rio Paraíba do Sul (sudeste do Brasil)

Silva, Thiago Pinto da; Mello, Cláudio Limeira

doi:10.5327/z1519-874x2011000100006

Cited by 23 publications

(22 citation statements)

References 16 publications

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“…In spite of the local arrangement of faults encountered in the area IV (Fig. 9d) indicates a NE-SW distension, these structures are compatible with the dextral strike-slip tensor that acted in the Pleistocene according to some authors (Riccomini et al, 1989;Salvador and Riccomini, 1995;Silva and Mello, 2011). Another possibility is that these faults were generated by the gravitational collapse proposed by Zal an and Oliveira (2005), which would generate a sinistral transtension with the minor axis oriented to NW-SE between 58 and 20 Ma.…”

Section: Discussionmentioning

confidence: 51%

“…9a, b, and c), it is possible that this local state of stress is a consequence of a different tensor arrangement acting regionally. According to previous researchers (Riccomini et al, 1989;Salvador and Riccomini, 1995;Silva and Mello, 2011), a sinistral transcurrent and a NW-SE distensional tectonic event acted in the SE Brazil, respectively, in the Neogene and Quaternary. Both of them have the minor tension axis in the NW-SE quadrant and such state of stress could generate the set of faults that we observed onshore.…”

Section: Discussionmentioning

confidence: 93%

“…For the Neogene and younger times, many controversies remain about the existence of one or more effort arrangements in the SE Brazilian margin. Some authors propose an E-W sinistral strike-slip (Riccomini et al, 1989;Salvador and Riccomini, 1995;Silva and Mello, 2011) and others a transpressional tensor, with the greatest principal axis close to E-W (Cogn e et al, 2013;Salomon et al, 2015). For Zal an and Oliveira (2005), the sinistral strike-slip with the minor axis oriented to NW-SE comes from the Paleogene up to the Neogene.…”

Section: Tectonic and Structural Evolution Of The Onshore Areamentioning

confidence: 99%

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The Alegre Lineament and its role over the tectonic evolution of the Campos Basin and adjacent continental margin, Southeastern Brazil

Calegari

Neves

Guadagnin

et al. 2016

Journal of South American Earth Sciences

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The structural framework and tectonic evolution of the sedimentary basins along the eastern margin of the South American continent are closely associated with the tectonic framework and crustal heterogeneities inherited from the Precambrian basement. However, the role of NW-SE and NNW-SSE structures observed at the outcropping basement in Southeastern Brazil and its impact over the development of those basins have not been closely investigated. In the continental region adjacent to the Campos Basin, we described a geological feature with NNW-SSE orientation, named in this paper as the Alegre Fracture Zone (AFZ), which is observed in the onshore basement and can be projected to the offshore basin. The main goal of this work was to study this structural lineament and its influence on the tectonic evolution of the central portion of the Campos Basin and adjacent mainland. The onshore area was investigated through remote sensing data joint with field observations, and the offshore area was studied through the interpretation of 2-D seismic data calibrated by geophysical well logs. We concluded that the AFZ occurs in both onshore and offshore as a brittle deformation zone formed by multiple sets of fractures that originated in the Cambrian and were reactivated mainly as normal faults during the rift phase and in the Cenozoic. In the Campos Basin, the AFZ delimitates the western side of the Corvina-Parati Low, composing a complex fault system with the NE-SW faults and the NW-SE transfer faults.

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Section: Discussionmentioning

confidence: 51%

Section: Discussionmentioning

confidence: 93%

Section: Tectonic and Structural Evolution Of The Onshore Areamentioning

confidence: 99%

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The Alegre Lineament and its role over the tectonic evolution of the Campos Basin and adjacent continental margin, Southeastern Brazil

Calegari

Neves

Guadagnin

et al. 2016

Journal of South American Earth Sciences

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“…The third environment is located to the south of the mountain range, with predominance of high, mountainous topography and flat valley bottoms, embedded, and elongated. These landscapes are characteristic of the Zona da Mata region, which usually has low fertility soils covered with pastures, coffee fields, and forests (Resende et al, 2014) and highly dissected landscapes of the "mares de morros" (sea-of-hills) (Ab'Sáber, 1975;Silva and Mello, 2011). In this area, rivers generally have terraces and alluvial plains (Silva and Mello, 2011;Schaefer, 2013;Resende et al, 2014).…”

Section: Study Areamentioning

confidence: 99%

Digital Soil Mapping Using Machine Learning Algorithms in a Tropical Mountainous Area

Meier

Souza

Francelino

et al. 2018

Rev. Bras. Ciênc. Solo

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Increasingly, applications of machine learning techniques for digital soil mapping (DSM) are being used for different soil mapping purposes. Considering the variety of models available, it is important to know their performance in relation to soil data and environmental variables involved in soil mapping. This paper investigated the performance of eight machine learning algorithms for soil mapping in a tropical mountainous area of an official rural settlement in the Zona da Mata region in Brazil. Morphometric maps generated from a digital elevation model, together with Landsat-8 satellite imagery, and climatic maps, were among the set of covariates to be selected by the Recursive Feature Elimination algorithm to predict soil types using machine learning algorithms. Mapping performance was assessed using the confusion matrix, and the Z-test among the Kappa indexes of the matrices. In a conventional soil survey, the soils described and classified in the Brazilian System of Soil Classification [Argissolos Vermelho-Amarelos Distróficos-PVAd (Acrisols), Cambissolos Háplicos Tb Distróficos-CXbd (Cambisols), Gleissolos Háplicos Háplicos Tb Distróficos-GXbd (Gleysols), Latossolos Amarelos Distróficos-LAd (Xanthic Ferralsos), Latossolos Vermelho-Amarelos Distróficos-LVAd (Rhodic Ferralsols), and Neossolos Litólicos Distróficos-RLd (Neossols)] were grouped into composite mapping units (MU) using the conventional method. The eight algorithms showed similar performance without statistical difference (Kappa 0.42-0.48). The mapping of soils with varying slopes (LAd, LVAd, CXbd) showed lower accuracy, whereas soils on hydromorphic lowlands (GXbd) were classified more accurately. In map algebra, the result was rather satisfactory, with 63-67 % agreement between the conventional soil map and maps produced by machine learning. The areas with the largest disagreement in the DSM occurred in the LAd unit due to subtle color variation in the Latossolos mantle without a clear relation to any environmental variable, highlighting difficulties in DSM regarding hill slope landforms. Model performance was satisfactory, and good agreement with the conventional soil map demonstrates the importance of the DSM as a potential complementary tool for assisting soil mapping in mountainous areas in Brazil for the purpose of land use planning.

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“…As primeiras se associam a um controle "passivo", no qual as principais características do relevo denotam controle exercido pelo arcabouço litoestrutural, dado pela litologia presente e delimitada por certa configuração tectônica, sendo as formas elaboradas predominantemente por agentes erosivos (SAADI, 1991). As feições morfotectônicas, por seu turno, remetem ao componente "ativo" do relevo e englobam uma ligação efetiva entre a disposição dos elementos geométricos do substrato e da superfície do terreno com deformações crustais recentes, compreendidas como neotectônicas (ETCHEBEHERE, 2004 (ASMUS e FERRARI, 1978;RICCOMINI, 1989;RICCOMINI et al, 1989;SAADI, 1991, SAADI, 1993GONTIJO, 1999;MELLO, 2011;MARQUES NETO, 2012;MOURA et al 2013;REZENDE, 2013;MARENT, 2016).…”

Section: Introductionunclassified

Aspectos morfoestruturais e morfotectônicos na evolução do relevo da bacia do Rio Paraibuna (MG)

Neto¹,

Silva²,

Moreira³

2020

Principia

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Os estudos concernentes à neotectônica intraplaca têm interpretado o papel dos esforços deformacionais recentes na evolução do relevo e da drenagem, conforme tem ocorrido em bordas cratônicas como os cinturões móveis reativados durante a separação da Placa Afrobrasileira e ao longo do Cenozoico. No sudeste brasileiro, o período neotectônico, estabelecido a partir da primeira fase deformacional das estruturas vinculadas ao rifte sudeste, tem forjado reorganizações nos sistemas geomorfológicos e engendrado o surgimento de redes de drenagem referenciadas nos níveis de base pregressamente estabelecidos, como o rio Paraíba do Sul e o próprio Oceano Atlântico. A bacia do rio Paraibuna partilha de um conjunto de bacias hidrográficas geradas nessas primeiras fases de reativação firmadas entre o Oligoceno e o Mioceno, apresentando heranças das estruturas preteritamente formadas e evidências de tectônica ativa, cuja conjugação foi estabelecida mediante uma compartimentação morfoestrutural e morfotectônica, que, comparadas, confirmaram a atuação esperada de diferentes controles e desvelaram especificidades acerca da tectônica ativa vigente na região.

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Reativações neotectônicas na Zona de Cisalhamento do Rio Paraíba do Sul (sudeste do Brasil)

Cited by 23 publications

References 16 publications

The Alegre Lineament and its role over the tectonic evolution of the Campos Basin and adjacent continental margin, Southeastern Brazil

The Alegre Lineament and its role over the tectonic evolution of the Campos Basin and adjacent continental margin, Southeastern Brazil

Digital Soil Mapping Using Machine Learning Algorithms in a Tropical Mountainous Area

Aspectos morfoestruturais e morfotectônicos na evolução do relevo da bacia do Rio Paraibuna (MG)

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