Characteristics of the lithospheric mantle beneath northeastern Borborema Province, Brazil: Re–Os and HSE constraints on peridotite xenoliths

Ngonge, Emmanuel Donald; Hollanda, Maria Helena Bezerra Maia de; Puchtel, I. S.; Walker, Richard J.; Archanjo, Carlos José

doi:10.1016/j.jsames.2019.102371

Cited by 5 publications

(3 citation statements)

References 94 publications

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“…Archean craton in the Borborema Province. This seems to be corroborated by the findings of Ngonge et al (2019), which used Re-Os isotope to postulate an earlier Paleoproterozoic subcontinental lithospheric mantle beneath the N-E Borborema Province.…”

Section: R a F Tsupporting

confidence: 66%

Defining Lithospheric Limits with Deep Sourced Geophysics: The Case of São Francisco Craton and Borborema Province

Filho

Seoane

2022

Braz J Geophys

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The East Brazilian Shield is a product of the Neoproterozoic convergence and collage of rigid Archean lithospheric blocks, which stabilized at the end of the Paleoproterozoic Trans-Amazonian event (2.0 Ga). The areal extent of the São Francisco Craton is well understood by regional gravimetric surveys, but its northern limit with the Borborema Province is not so clear. The integration of gravity, magnetics and seismic velocity anomaly maps allows mapping this northern limit to the Borborema Province. Applying the vertical integration low-pass filter to satellite magnetics yields a remarkable match to the probable lithospheric suture zone. This magnetic map identifies the deep response from thinner/thicker lithospheres of Neoproterozoic mobile belts or stable cratons. One potential microcraton is the NE extension of the Borborema Province, one site of the oldest rocks in South America, a residue of the Benino-Nigerian Craton, separated from the main occurrence by the opening of the Atlantic. The Sergipana, Riacho do Pontal and Rio Preto Neoproterozoic fold-and-thrust belts mark areas of the foreland tectonism, hundreds of kilometers inside the São Francisco Craton lithospheric block. The presence of younger rocks inside the deep geophysical limits may be evidence of a large detachment of younger continental crust over the old cratonic lithosphere.

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Section: R a F Tsupporting

confidence: 66%

Defining Lithospheric Limits with Deep Sourced Geophysics: The Case of São Francisco Craton and Borborema Province

Filho

Seoane

2022

Braz J Geophys

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“…Além do entendimento sobre os processos que transformam a crosta terrestre, as rochas vulcânicas devido à presença de xenólitos mantélicos, que não são comumente observadas em rochas basálticas subalcalinas, mas que são mais fácilmente verificados naquelas alcalinas, permitem realizar investigações mineralógicas, químicas e condições de equilíbrio físico-químico sobre as regiões mantélicas em que foram formadas (Kurat et al, 1980;Dietrich & Poultidis, 1985;Ngonge et al, 2016;Ngonge et al, 2019).…”

Section: Introductionunclassified

Plug Frei Martinho: Magmatismo Cenozoico Alcalino No Norte Do Estado Da Paraíba

ARAÚJO BARROS,

CARVALHO LISBOA,

ARAÚJO AZEVEDO

et al. 2024

Geociencias

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Resumo: A ocorrência de vulcanismo de pequena escala é comum em vários locais do mundo, sendo estes corpos inseridos nos mais diversos contextos tectônicos. Na porção central dos estados do Rio Grande do Norte e Paraíba, ocorre uma série de plugs e necks de idade cenozoica e com composição predominantemente álcali-basáltica. O Plug Frei Martinho (PFM), é composto por basanitos isotrópicos de cor preta, de textura afanítica a microporfirítica e apresenta uma orientação relacionada ao alinhamento Macau-Queimadas. A olivina e o espinélio ocorrem como fenocristais, já a matriz é composta por nefelina, diopsídio, minerais opacos, plagioclásio, olivina, feldspato alcalino, apatita e vidro. A olivina mostra variação composicional entre Fo79,8 a Fo90,9, onde os termos mais magnesianos representam xenocristais. O diopsídio (Wo40,5-55,6En38-45,2Fs8,9-17,2) é a composição predominante entre os cristais de clinopiroxênio. O plagioclásio é sódico com molécula de An5,7-21,7. O feldspato alcalino possui composição Or32,7-45,5Ab51,2-63,7An2,1-7,3. As composições da nefelina variam no intervalo Ne60,48-83,11Ks9,33-19,03Q0,33-26,35. As estimativas de temperaturas obtidas a partir das composições dos feldspatos e feldspatoides indicam temperaturas entre 1068°C e 500°C para as rochas que compõem o PFM. Palavras-chave: Basanitos. Província Borborema. Química Mineral. Abstract: The occurrence of small-scale volcanisms is common in many places around the world, being included in the most diverse tectonic contexts. In the central portion of the states of Rio Grande do Norte and Paraíba, there is a series of plugs and necks of Cenozoic age and predominantly alkali-basaltic composition. The Frei Martinho Plug (FMP) is composed of black and isotropic basanites, with an aphanitic and microporphyritic texture and presents an orientation related to the Macau-Queimadas alignment. Olivine and spinel occur as phenocrysts, while the matrix is composed of nepheline, diopside, opaque minerals, plagioclase, olivine, alkali feldspar, apatite and glass. Olivine shows compositional variation between Fo79,8 to Fo90,9, where the more magnesian terms represent xenocrystals. Diopside (Wo40,5-55,6En38-45,2Fs8,9-17,2) is the predominant composition among clinopyroxene crystals. Plagioclase is sodium with An5,7-21,7 molecule. Alkali feldspar has composition Or32,7-45,5Ab51,2-63,7An2,1-7,3. Nepheline compositions vary in the range Ne60,48-83,11Ks9,33-19,03Q0,33-26,35. Temperature estimates obtained from the compositions of feldspars and feldspathoids indicate temperatures between 1068°C and 500°C for the rocks that make up the FMP. Keywords: Basanite. Borborema Province. Mineral Chemistry.

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“…Geochronological information indicates that this collision occurred in the neoproterozoic, between 650-530 Ma (Lima et al, 2017). We used this composition to constrain the lithospheric mantle below the Salvador-Esplanada-Boquím domain and for part of the Sergipano Belt, while the second one, mantle 2, was extracted from Ngonge et al (2019) based on continental mantle xenolith sample of the Borborema Province. This composition was used for the lithospheric mantle below the Rio Coruripe, Marancó, Poço-Redondo, Canindé domains and the Pernambuco-Alagoas domain.…”

Characteristics of the lithospheric mantle beneath northeastern Borborema Province, Brazil: Re–Os and HSE constraints on peridotite xenoliths

Cited by 5 publications

References 94 publications

Defining Lithospheric Limits with Deep Sourced Geophysics: The Case of São Francisco Craton and Borborema Province

Defining Lithospheric Limits with Deep Sourced Geophysics: The Case of São Francisco Craton and Borborema Province

Plug Frei Martinho: Magmatismo Cenozoico Alcalino No Norte Do Estado Da Paraíba

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