Structural framework of the Jaibaras Rift, Brazil, based on geophysical data

Junior, Nilo Costa Pedrosa; Vidotti, Rose Meire; Fuck, Reinhardt A.; Oliveira, Karen M. Leopoldino; Branco, Raimundo Mariano Gomes Castelo

doi:10.1016/j.jsames.2014.07.005

Cited by 21 publications

(16 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nevertheless, the basement of the Parnaíba Basin presents a series of small N-S-, NW-SE-and NE-SW-trending riftlike structures, mainly defined by potential data analyses, which have been considered the precursory structures of the overlying sag basin (Nunes 1993;Oliveira & Mohriak 2003;Castro et al 2016). Among these the largest is the Jaibaras rift (Oliveira & Mohriak 2003;Pedrosa Jr. et al 2015, 2017, exposed along and apparently controlled by the Transbrasiliano Lineament, which crosscuts the Parnaíba Basin in its southeastern segment (Fig. 2).…”

Section: Tectonic Settingmentioning

confidence: 99%

Structure of the crust and upper mantle beneath the Parnaíba Basin, Brazil, from wide-angle reflection–refraction data

Soares

Stephenson

Fuck

et al. 2018

Self Cite

View full text Add to dashboard Cite

The Parnaíba Basin is a Phanerozoic intracontinental basin within the South America plate, lying on top of and within Precambrian terranes. The Parnaíba Basin Analysis Program wide-angle reflection–refraction (WARR) lies east–west and is 1150 km long profile crossing the basin and its margins. The WARR results show that the crust and uppermost mantle along the profile consist of the Amazonian Craton and Borborema Province, and the Grajaú and Teresina domains comprising the Parnaíba block hidden below the sedimentary cover of the basin itself. The lithospheric characteristics of the Parnaíba block and their differences from the adjacent Precambrian Amazonian Craton and Borborema Province elucidate some aspects of the present day existence of the sedimentary basin covering it. Important elements include the presence of a high mantle velocity and high-velocity lowermost crustal region, interpreted as linked to the intrusion of mafic material into the crust underlying the Grajaú domain, and indications that the crust in this area has been intruded since its consolidation in the Neoproterozoic. It is tentatively proposed that magmatism is related to the inferred thinning of the lower crust of the Teresina and Borborema segments of the profile, with this, in turn, linked to Cretaceous extensional tectonics and the opening of the South Atlantic Ocean.

show abstract

Section: Tectonic Settingmentioning

confidence: 99%

Structure of the crust and upper mantle beneath the Parnaíba Basin, Brazil, from wide-angle reflection–refraction data

Soares

Stephenson

Fuck

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…O conhecimento estrutural do LTB na BPar tem sido abordado a partir de interpretações de imagens orbitais, bem como de dados geofísicos e de campo (Góes et al, 1990;Nunes, 1993;Destro et al, 1994;Oliveira e Mohriak, 2003;Cordani et al, 2009;Chamani, 2011Chamani, , 2015Santos et al, 2013;Morais Neto et al, 2013;Castro et al, 2014Castro et al, , 2016Daly et al, 2014;Pedrosa Jr. et al, 2014;Cacama et al, 2015;Lima, 2015;Antunes et al, 2015Antunes et al, , 2016. As poucas seções geológicas publicadas (Milani e Thomaz Filho, 2000) ilustram a geometria característica de uma sinéclise, com as sequências paleozoicas sendo afetadas por falhas que, pelo menos em parte, estão associadas ao LTB.…”

Section: Contextualização Geológica Regionalunclassified

Controle estrutural da borda sudeste da Bacia do Parnaíba, Nordeste do Brasil: relação com eventos geodinâmicos no Gondwana

Lima

Sá

2017

Geol. USP. Sér. Cient.

View full text Add to dashboard Cite

Disponível on-line no endereço www.igc.usp.br/geologiausp -3 -Resumo O limite sudeste da Bacia do Parnaíba (BPar), região fronteiriça aos Estados do Piauí, da Bahia e de Pernambuco (Nordeste do Brasil), é cartografado como uma não conformidade entre o Grupo Serra Grande (GSG, Siluriano) e o embasamento pré-cambriano. Todavia, essa borda é caracterizada por uma expressiva orientação NE, paralela ao Lineamento Transbrasiliano, bem como pelo estreitamento das faixas aflorantes das formações siluro-devonianas, em comparação ao observado mais ao norte, na borda leste. Um enxame de fotolineamentos NE, interpretados a partir de imagens de sensores remotos, ocorrem tanto ao longo do limite da bacia com o embasamento cristalino, como nas unidades sedimentares eopaleozoicas. Com o suporte de dados de campo, três padrões estruturais foram reconhecidos e correlacionados a eventos deformacionais distintos. A Deformação D n , de idade ediacarana-cambriana, é reconhecida apenas no embasamento cristalino pré-cambriano, sendo relacionada a uma etapa tardia, retrometamórfica e de caráter plástico-frágil das zonas miloníticas brasilianas. A assinatura desse evento inclui zonas de cisalhamentos transcorrentes destrais orientadas NE-SW e veios de quartzo preenchendo juntas de distensão E-W. A Deformação D n+1 corresponde a uma nova etapa de movimentação transcorrente destral nas estruturas NE-SW, acompanhada por falhas normais e juntas de distensão com orientação WNW a E-W, neste caso também afetando as unidades siluro-devonianas. A Deformação D n+2 é caracterizada por falhas normais, diques bási-cos (correlacionados à Suíte Sardinha, eocretácea), veios silicosos e cristas de arenitos silicificados, todos com orientação NE-SW. Essa última fase resulta de uma distensão com orientação NW-SE, análoga àquela reconhecida mais ao leste, nas Bacias Interiores do Nordeste do Brasil, associada ao rifteamento do Atlântico Sul.Palavras-chave: Bacia do Parnaíba; Borda Sudeste; Análise estrutural. AbstractAlong the frontier between Piauí, Bahia and Pernambuco States (Northeast Brazil), the southeastern border of the Parnaíba Basin (BPar) is been mapped as a nonconformity between the Serra Grande Group (GSG) and the Precambrian basement. However, this border is characterized by an expressive NE trend parallel to the one of the Transbrasiliano Lineament, as well as a narrowing of the outcropping belt of the Silurian-devonian formations, as compared to the situation further north, in the east basin border. A swarm of NE-trending photolineaments was interpreted from remote sensing images. They occur very close (or coinciding) to the basin/basement limit or superimposed on the paleozoic units (especially the GSG and the Pimenteiras Formation). Supported by field data, three structural patterns were recognized and correlated to distinct deformation events. D n deformation, of ediacaran-cambrian age and observed just in the Precambrian basement rocks, is related to a retrometamorphic, plastic-brittle late stage of Brasiliano mylonite zones. It is chara...

show abstract

“…2). The rift occurs along the northern part of the Transbrasiliano Lineament (Schobbenhaus et al, 1975), locally known as Sobral-Pedro II Shear Zone (SPIISZ), with dextral strike-slip kinematics (Almeida, 1998;Oliveira, 2001;Oliveira and Mohriak, 2003;Pedrosa et al, 2015;Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…Average density estimates of the outcropping rocks, information from other geophysical methods and boreholes were used to reduce ambiguity. Recently, Pedrosa et al (2015) discussed and interpreted the gammaspectrometric, magnetic and gravity signatures in the Jaibaras Rift region. Geophysical products generated by the authors show regional structures with major NE-SW and E-W trending lineaments in MCD and NE-SW in CCD (Figs.…”

Section: Introductionmentioning

confidence: 99%

Architecture of the intracontinental Jaibaras Rift, Brazil, based on geophysical data

Junior

Vidotti

Fuck

et al. 2017

Journal of South American Earth Sciences

Self Cite

View full text Add to dashboard Cite

Structural framework of the Jaibaras Rift, Brazil, based on geophysical data

Cited by 21 publications

References 52 publications

Structure of the crust and upper mantle beneath the Parnaíba Basin, Brazil, from wide-angle reflection–refraction data

Structure of the crust and upper mantle beneath the Parnaíba Basin, Brazil, from wide-angle reflection–refraction data

Controle estrutural da borda sudeste da Bacia do Parnaíba, Nordeste do Brasil: relação com eventos geodinâmicos no Gondwana

Architecture of the intracontinental Jaibaras Rift, Brazil, based on geophysical data

Contact Info

Product

Resources

About