Petrogenesis of the Low-TiO2 Batalha Suite in the eastern Parnaíba basin, northeastern Brazil

Miloski, Pedro; Valente, Sérgio de Castro; Mendes, Júlio Cézar; Almeida, Cícera Neysi de; Negri, Francisco de Assis; Medeiros, Sílvia Regina de; Miranda, Alan Wanderley Albuquerque; Corval, Artur; Borghi, Leonardo

doi:10.1007/s00531-020-01829-5

Cited by 5 publications

(1 citation statement)

References 63 publications

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“…Although sills are mapped from north to south along the entire eastern side of the basin, the groundbreaking works have restricted the sampling to a small central area ignoring much of the geographic (and maybe geochemical) representativeness of this magmatism. Supported by resources of the oil-gas industry, some scientific papers were recently published dealing on the geochemical aspects of these eastern sills (Silva et al, 2017;Oliveira, et al, 2018;Heilbron et al, 2018;Miloski et al, 2019Miloski et al, , 2020. Despite the merits, important sampling gaps persist, especially in southeastern areas.…”

Section: Rationalementioning

confidence: 99%

Geochemical characterization of the Equatorial Atlantic Magmatic Province and its correlation with other magmatic events related to the South Atlantic Opening

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EQUAMP). The petrological approach developed over the Rio Ceará Mirim-Canindé dikes and Sardinha sills (petrography, mineral chemistry, whole-rock geochemistry, and Sr-Nd-Pb isotopes) enabled the discrimination of two major geochemical groups: (1) high-Ti tholeiites (HT; TiO2 > 2.0 wt.%), rich incompatible elements with initial 87 Sr/ 86 Sr (~0.706) and εNd(130) (-3.0 av.), and moderately radiogenic 206 Pb/ 204 Pb(m) ratios of ~18.3; The HT melts sometimes form evolved rocks such as trachyandesites and trachytes with lower TiO2 (generally < 2.5 wt.%; MgO < 3 wt.%). (2) Low-Ti tholeiites composed by evolved basaltic andesites with MgO < 6 wt.% and less radiogenic Nd (εNd(130) -4.65 to -4.40). The HT tholeiites are prevalent in dikes and sills. However, the LT group is reported just on the Borborema Province. These magmas have different degrees of enrichments in large ion lithophiles and light rare-earth elements, coupled with depletion in high-field-strength elements (Nb-Ta) and isotopic (Sr-Nd-Pb) signatures compatible with enriched mantle sources (EM-like). Additionally, few sets of dikes and sills have geochemical signature akin to the Central Atlantic Magmatic Province (CAMP). They form subalkaline (to transitional) basalts and basaltic andesites with MgO > 6 wt.% and slightly more radiogenic Nd (εNd(130) -1.3 av.), as similarly observed in the low-Ti Prevalent CAMP group. Two restrict sites in the Parnaíba Basin present very radiogenic Nd (εNd(130) ~6.1-3.

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Section: Rationalementioning

confidence: 99%

Geochemical characterization of the Equatorial Atlantic Magmatic Province and its correlation with other magmatic events related to the South Atlantic Opening

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Ichnology in storm and fair-weather beds of an epeiric sea (Pimenteira Formation, Devonian, Brazil)

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Agostinho

Sedorko

et al. 2023

Journal of South American Earth Sciences

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Magma plumbing systems in the Parnaíba Basin: Geochemistry, geochronology, and regional correlations with Mesozoic large igneous provinces

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Hollanda

Oliveira

et al. 2023

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Petrogenesis of the Low-TiO2 Batalha Suite in the eastern Parnaíba basin, northeastern Brazil

Cited by 5 publications

References 63 publications

Geochemical characterization of the Equatorial Atlantic Magmatic Province and its correlation with other magmatic events related to the South Atlantic Opening

Geochemical characterization of the Equatorial Atlantic Magmatic Province and its correlation with other magmatic events related to the South Atlantic Opening

Ichnology in storm and fair-weather beds of an epeiric sea (Pimenteira Formation, Devonian, Brazil)

Magma plumbing systems in the Parnaíba Basin: Geochemistry, geochronology, and regional correlations with Mesozoic large igneous provinces

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