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

Junior, Nilo Costa Pedrosa; Vidotti, Rose Meire; Fuck, Reinhardt A.; Branco, Raimundo Mariano Gomes Castelo; Almeida, Ana Fabíola Leite; Silva, Nilton C. Vieira; Braga, Luiz Ricardo Cunha

doi:10.1016/j.jsames.2016.12.012

Cited by 17 publications

(10 citation statements)

References 35 publications

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“…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

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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.

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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

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“…Magnetic anomalies (Fig. 3B) correspond to lower temperature (ductile-brittle) strike-slip dextral shear zones NE-SW oriented, like the ones that border Jaibaras and Cococi graben in Northwest Ceará (Cacama et al, 2015;Pedrosa Jr et al, 2016).…”

Section: Analysis Of Gravity and Magnetic Anomaly Mapsmentioning

confidence: 99%

“…Pre-Silurian grabens display variable gravity and magnetic signatures, mainly due to the thickness of the sedimentary cover and abundance of volcanic intercalations (Pedrosa Jr et al, 2016). The interplay between different basement sources, deeper or shallower, and their own heterogeneity represents a major difficulty when interpreting these grabens (or other kinds of pre-Silurian basins; Miranda, 2017) solely based on potential methods data.…”

Section: Analysis Of Gravity and Magnetic Anomaly Mapsmentioning

confidence: 99%

Gravity and Magnetic Signature of the Transbrasiliano Lineament in the East-Central Portion of the Parnaíba Basin, Northeastern Brazil

Lima¹,

Sá²,

Lins³

et al. 2017

Rev. Bras. Geof.

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ABSTRACT. The Transbrasiliano Lineament (TBL) corresponds to a NE-trending mega shear zone of late Neoproterozoic age with an extensive segment underneath the Parnaíba Basin (northeastern Brazil); the Eopaleozoic to Mesozoic section of the basin evidence the lineament’s brittle reactivation events. This paper presents a case study of TBL in the east-central portion of Parnaíba Basin with a special concern to the characterization of pre-Silurian grabens in the basement. The approach involves the interpretation of potential field data and seismic reflection line based on a plastic dextral transcurrent mega shear zone model. The gravity anomaly belts display a curvilinear shape joining the NE trend of the TBL, in accordance to a dextral S-C pair. A retrogressive stage with narrower ductile-brittle dextral structures controlled the opening of pull-apart grabens. Magnetic anomalies seem to be related to these late structures. The integration of the map analyses, seismic interpretation and 2D gravity modeling led to the conclusion that the sources causing the gravity and magnetic anomalies in the basin result from mass variations related to anisotropies of the crystalline basement and crustal heterogeneities, such as granite plutons, metasedimentary belts, shear zones and pre-Silurian grabens. The delimitation of grabens underneath the Parnaíba Basin suffers severe restrictions when solely interpreted based on potential field data. Keywords: gravity forward modeling, Transbrasiliano Lineament, magnetic anomaly. RESUMO. O Lineamento Transbrasiliano (LTB) corresponde a uma megazona de cisalhamento com direção NE, de idade Neoproterozoica, com um extenso segmento subjacente à Bacia do Parnaíba; a seção Eopaleozoica a Mesozoica da bacia evidencia seus eventos de reativação. Este trabalho aborda o LTB na porção centro-leste da Bacia do Parnaíba, com especial atenção à caracterização de grabens pré-Silurianos do embasamento. A abordagem envolve interpretações de dados de métodos potenciais e de linha sísmica de reflexão baseadas em um modelo de megazona de cisalhamento plástica transcorrente dextral. As faixas de anomalias gravimétricas exibem uma geometria curvilínea, aproximando-se em direção ao trend NE do Lineamento Transbrasiliano, em consonância a um par S-C dextral. Um estágio retrogressivo com estruturas dúcteis-frágeis mais estreitas controlaram a abertura de grabens pull-apart. As anomalias magnéticas imageam essas estruturas tardias. A integração da análise de mapas de anomalia, interpretação sísmica e modelagem gravimétrica 2D permite concluir que as fontes causadoras das anomalias gravimétricas e magnéticas na bacia resultam de variações de massa relacionadas a heterogeneidades crustais e às anisotropias do embasamento cristalino, tais como plútons graníticos, faixas de metassedimentos e zonas de cisalhamento, com contribuição subordinada dos grabens pré-Silurianos. A delimitação desses grabens subjacentes à Bacia do Parnaíba sofre severas restrições quando interpretadas unicamente com base nos dados de métodos potenciais. Palavras-chave: modelagem gravimétrica direta, Lineamento Transbrasiliano, anomalia magnética.

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“…The Ceará Central Domain comprises medium-to high-grade metamorphic rocks, constituting part of the Ceará Complex (Neoproterozoic supracrustal rocks and Archean-Palaeoproterozoic basement) and the Tamboril-Santa Quitéria Complex (Neoprot erozoic syn-, late-and post-collisional granite and migmatite complex) (Fetter et al 2003;Pedrosa Jr et al 2017;Fig. 3).…”

Section: A Jaibaras Basin: Sedimentary Archive Of the Rift Phasementioning

confidence: 99%

“…Post-collisional granite and gabbro intrusions related to the Meruoca and Mucambo granites (Fig. 1), and Early Cambrian volcanic and sedimentary rocks from the Jaibaras Basin and Jaguaripi Graben, are also included in the Médio Coreaú Domain (Pedrosa Jr et al 2017).…”

Section: A Jaibaras Basin: Sedimentary Archive Of the Rift Phasementioning

confidence: 99%

So close and yet so far: U–Pb geochronological constraints of the Jaibaras Rift Basin and the intracratonic Parnaíba Basin in SW Gondwana

et al. 2021

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Several sag-type basins apparently developed from rift systems, but there is no consensus about how and if these grabens influenced the sedimentation of the post-rift thermal subsidence phase. The Ediacaran Jaibaras Rift Basin is one of the best-exposed sedimentary records among the NE Brazil late Precambrian – early Cambrian rift system, cropping out at the eastern margin of the intracratonic Parnaíba Basin and extending below it towards the west. Here we present detrital zircon U–Pb ages of rocks from the Jaibaras (Aprazível Formation) and Parnaíba (Ipu Formation) basins, in order to understand the provenance patterns, maximum depositional ages (MDA) and age relationship between these units. The MDA for the Aprazível Formation (c. 499 ± 5 Ma) indicates a Cambrian age for the upper part of the Jaibaras Basin. The bulk U–Pb data indicate that the Ipu Formation started to deposit during late Cambrian and/or Early Ordovician time, despite its MDA (c. 528 ± 11 Ma) being older than that of the Aprazível Formation. Detrital zircon provenance suggests that the primary source areas for the early deposits of the Parnaíba Basin were mountains related to the Brasiliano Orogeny to the south and SE (e.g. Rio Preto and Riacho do Pontal metamorphic belts). Finally, our data emphasize the key change in source areas from the rift to the initial deposition of the intracratonic phase, indicating major depositional style changes between both basins after the Gondwana assembly.

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

Cited by 17 publications

References 35 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

Gravity and Magnetic Signature of the Transbrasiliano Lineament in the East-Central Portion of the Parnaíba Basin, Northeastern Brazil

So close and yet so far: U–Pb geochronological constraints of the Jaibaras Rift Basin and the intracratonic Parnaíba Basin in SW Gondwana

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