Deep seismic refraction experiment in northeast Brazil: New constraints for Borborema province evolution

Lima, Marcus Vinicius Aparecido Gomes de; Berrocal, Jesús; Soares, Joelson Lima; Fuck, Reinhardt A.

doi:10.1016/j.jsames.2014.10.007

Cited by 51 publications

(45 citation statements)

References 28 publications

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“…1 and 2, Figs. 2 and 3), as well as the geophysical data available in the literature (Oliveira 2008, 2013, Santos et al 2013, Castro et al 2014, Daly et al 2015, Lima et al 2015, Padilha et al 2016, the following arguments support the magmatic arc model: 1. Juxtaposition of the continental parts of former continental plates (Tab.…”

Section: Main Arguments For the Magmatic Arc Propositionmentioning

confidence: 77%

A preserved early Ediacaran magmatic arc at the northernmost portion of the Transversal Zone central subprovince of the Borborema Province, Northeastern South America

Neves¹,

Santos²,

Fuck³

et al. 2016

Braz. J. Geol.

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ABSTRACT:Magmatic arcs are an essential part of crust-forming events in planet Earth evolution. The aim of this work was to describe an early Ediacaran magmatic arc (ca. 635-580 Ma) exposed in the northernmost portion of the Transversal Zone, central subprovince of Borborema Province, northeast Brazil. Our research took advantage of several syntheses by different authors, including theses and dissertations, carried out on magmatic rocks of the study area for the last 30 years. The ca. 750 km long and up to 140 km wide arc, trending ENE-WSW, is preserved to the south of the Patos Lineament, between 35º15' and 42º30'W and 7º15' and 8ºS. About 90 different stocks and batholiths of I-type granitic rocks were mapped along this orogenic zone, preferentially intruding low-grade schists of the Cryogenian-Ediacaran Piancó-Alto Brígida (SPAB) belt. Three igneous supersuites are recognized: a) epidote-bearing granodiorites and tonalites ("Conceição" type); b) high-K calc-alkaline granites ("Itaporanga" type); c) biotite granodiorites of trondhjemite affinity ("Serrita" type). A fourth group of peralkalic and shoshonitic rocks occurs to the south of the previous ones, reflecting special tectonic conditions. NNE-SSW trending Paleoproterozoic fold belts, surrounding Archean nuclei, characterize the continental part of the northern lower plate. The oceanic fraction of this lower plate was recycled by subduction and scarce remnants of which may be seen either within the enclosing low-grade schists or as xenoliths within the arc intrusions. The upper continental plate presents WSW-ENE structural trends and is composed of Neoproterozoic fold belts and Paleoproterozoic reworked basement inliers. Available data bear clear evidence of an Ediacaran magmatic arc built at the northern portion of the Transversal Zone in the Borborema Province, northeast Brazil. KEYWORDS: Borborema Province; Transversal zone; Magmatic arc; Epidote-bearing granodiorites and tonalites; Continental boundary transform. RESUMO: O objetivo deste trabalho é introduzir o conceito de um arco magmático eoediacarano (ca. 635-580 Ma) na porção norte da zona transversal, subprovíncia central da Província

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Section: Main Arguments For the Magmatic Arc Propositionmentioning

confidence: 77%

A preserved early Ediacaran magmatic arc at the northernmost portion of the Transversal Zone central subprovince of the Borborema Province, Northeastern South America

Neves¹,

Santos²,

Fuck³

et al. 2016

Braz. J. Geol.

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“…Lima et al (2015), utilizando mé-todos sísmicos, sugerem que o soerguimento do Platô Borborema foi causado por desequilíbrio térmico na crosta durante a ruptura do Gondwana e abertura do Oceano Atlântico Sul, no Cretaceo. O desequilíbrio térmico e o magmatismo sin-e pós--rifte (60-40 Ma) presentes ao longo da margem equatorial brasileira, na Província Borborema , influenciaram a evolução dessa margem e registraram esses eventos nas idades TFA (Fig.…”

Section: Discussão Dos Resultadosunclassified

“…A província é coberta a oeste por rochas sedimentares Fanerozoicas e vulcânicas da Bacia do Parnaíba, e ao norte e leste por depósitos costeiros Meso-Cenozoicos. O contexto geomorfológico da província não exibe alto topográficos próximo ao litoral, mas é caracterizado pelo Platô da Borborema, que se eleva da planície costeira até ~1000 m ao norte do rio São Francisco, cuja origem epirogênica está relacionada com a ruptura do supercontinente Gondwana e ao magmatismo intraplaca Cenozoico (Lima et al, 2015).…”

Section: Contexto Geológicounclassified

História termotectônica da margem continental brasileira a partir de dados de traços de fissão em apatita

Oliveira

Jelinek

2017

Pesq Geoc

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A margem continental brasileira denota estruturas geomorfológicas moldadas durante vários episódios de atividade tectônica iniciados no Neoproterozoico. Com o objetivo de estabelecer um modelo de história termotectônica para a margem continental brasileira, foi realizada a integração e reinterpretação dos dados traços de fissão em apatita (TFA) disponíveis ao longo de toda a margem continental. As idades TFA variam de ~385-10 Ma. Os dados TFA revelam que a margem continental foi caracterizada por pelo menos três eventos térmicos após o Ciclo Brasiliano: Cretaceo Inferior, Cretaceo Superior e Paleógeno-Neógeno. Os eventos são relacionados aos processos de abertura do Oceano Atlântico Sul e às fases rifte e pós-rifte, com reativações tectônicas ao longo da margem. A Província Mantiqueira e o Cráton São Francisco registram os eventos mais antigos, desde o Ordoviciano e o Permiano, respectivamente, que afetaram de modo variado diferentes partes dessas províncias como reflexo das orogenias Famatiniana e Gondwanide.

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“…According to Lima et al (2015) and their seismic profile, the actual thickness and internal structure of the crust of the Borborema province show that it was affected by traction processes that strongly reworked and thinned the crust, a process possibly related to the breakup of Pangaea in the Cretaceous, leading to the South Atlantic Ocean opening. There would be no seismic evidence of crustal underplating under the seismic profile.…”

Section: Regional Basin Inversionmentioning

confidence: 99%

Stepped Surfaces, Palaeolandforms and Morphostratigraphy: Reconstructing the Long-Term Landscape Evolution Since the Mesozoic

Peulvast

Bétard

2015

Landforms and Landscape Evolution of the Equatorial Margin of Northeast Brazil

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The present relief reflects a juxtaposition of highly contrasting elements of various ages. The landscape formed in the context of a fluctuating but continuously falling base level since the Cenomanian. After formation of the transform passive margin in Aptian times, landscape development was further driven by regional swell-like uplift. The seaward flank of this broad monocline was eroded, whereas the post-Cenomanian uplift caused an inversion of the Cretaceous basins and generated a landscape in which the most elevated landforms correspond either to resistant Mesozoic sedimentary caprock, or to eroded stumps of syn-rift Cretaceous footwall uplands. Some topographic surfaces at low elevations are Mesozoic land surfaces that became re-exposed in Cenozoic times. Denudation in the last 90 Myear never exceeded mean rates of 10 m Myear −1 and exhumed various Cretaceous stratigraphic unconformities. Obtained by morphostratigraphic methods, these results differ significantly from published AFT-derived estimates reported from Palaeozoic and Mesozoic sandstones of the Araripe basin, implying burial by a considerable thickness of younger section and, later, 1.5 km of post-rift denudation, i.e. two to three times as much as our maximum 0.6-0.7 km estimation. The likelihood of such a scenario is discussed, in the light of the exhumation of surrounding basement surfaces, which probably began very early, as shown to the northwest of the Chapada do Araripe by the presence of widespread laterites of probable Paleogene age. The distribution of these paleosoils indicates an early beginning of the basin topographic inversion, which might correspond to the first post-rift denudation episode reported by the AFTA. The second one, in the Oligocene and later, would correspond to the major stage of river incision and basin inversion. The origin of the discrepancy between the two sets of results is discussed, as well as the causes and exact timing of post-Cenomanian crustal upwarping.

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Deep seismic refraction experiment in northeast Brazil: New constraints for Borborema province evolution

Cited by 51 publications

References 28 publications

A preserved early Ediacaran magmatic arc at the northernmost portion of the Transversal Zone central subprovince of the Borborema Province, Northeastern South America

A preserved early Ediacaran magmatic arc at the northernmost portion of the Transversal Zone central subprovince of the Borborema Province, Northeastern South America

História termotectônica da margem continental brasileira a partir de dados de traços de fissão em apatita

Stepped Surfaces, Palaeolandforms and Morphostratigraphy: Reconstructing the Long-Term Landscape Evolution Since the Mesozoic

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