Correlations among large igneous provinces related to the West Gondwana breakup: A geochemical database reappraisal of Early Cretaceous plumbing systems

Filho, Antomat Avelino Macêdo; Hollanda, Maria Helena Bezerra Maia de; Fraser, Stephen; Oliveira, André Luíz de; Melo, Alanny Christiny Costa de; Dantas, Alana Régia

doi:10.1016/j.gsf.2022.101479

Cited by 8 publications

(12 citation statements)

References 153 publications

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“…Sample DCE68, a low-Ti tholeiite from the Senador Pompeu dike (Supplementary file) was initially presumed to be part of the ca 133 Ma EQUAMP 35 due to its outcropping proximity. However, geochemical, and isotopic signatures revealed that CAMP rocks were intermingled in the EQUAMP area [18][19][20] . A total of seven single crystals were analyzed, where one was considerably younger and treated as biased by Pb* loss.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, we further test the CAMP-ETE causality hypothesis by presenting a high-precision CA-IDTIMS U-Pb zircon age for a previously undated CAMP dike swarm in NE-Brazil 18 . The Senador Pompeu dike is representative of a ~ 360 km long dike swarm hosted in the Precambrian basement of the Borborema Province, located ~ 1500 km eastward of the Amazonas Basin and exhibiting similar geochemical and isotopic characteristics to low-Ti magmas of the CAMP [18][19][20] . Overall, the Senador Pompeu dikes (Fig.…”

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confidence: 99%

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New U–Pb geochronology for the Central Atlantic Magmatic Province, critical reevaluation of high-precision ages and their impact on the end-Triassic extinction event

Oliveira

Schmitz

Wall

et al. 2023

Sci Rep

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The end-Triassic extinction (ETE) event represents one of the ‘big five’ episodes of mass extinction. The leading hypothesis for the cause of the ETE is the intrusion of voluminous magmas of the Central Atlantic Magmatic Province (CAMP) into carbon-rich sediments of two South American sedimentary basins, around 201.5 Ma. The timing of dikes and sills emplacement, however, must be considered in light of age models from CAMP rocks occurring in North America. In this work, we present new high-precision ages for critical samples in NE Brazil (201.579 ± 0.057 Ma) and Canada (201.464 ± 0.017 Ma), in order to evaluate how the South and North American magmatic events compare at the 100-ka level, and to the ETE timing. We also discuss inter-laboratory reproducibility of high-precision CAMP ages, including the 230Th disequilibrium corrections that are made to zircon U–Pb dates. Our findings in this newly discovered extension of the CAMP large igneous province in NE Brazil support the hypothesis that the CAMP may be responsible for the ETE through the triggering of greenhouse gas release from magma-evaporite interactions (contact metamorphism) in the South American basins.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

New U–Pb geochronology for the Central Atlantic Magmatic Province, critical reevaluation of high-precision ages and their impact on the end-Triassic extinction event

Oliveira

Schmitz

Wall

et al. 2023

Sci Rep

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“…The region emerged around the BEM is intruded by mafic dikes swarms and sills with ages ranging between ∼135 and 120 M.y. (Hollanda et al, 2019b;Macêdo Filho et al, 2023), which extend to the south toward the Paraná-Etendeka LIP shown in Figure 1.…”

Section: 1029/2023tc008184mentioning

confidence: 96%

“…Pink dashed polygons represent the offshore magmatic domain, and orange lines mark mapped dikes. Ages are from Macêdo Filho et al (2023) and references therein; and age for Paraná flood basalts (9) after Baksi and Archibald (1997).…”

Section: Geologic Settingmentioning

confidence: 99%

“…Etendeka Large Igneous Province (LIP) magmatic event (Moulin et al, 2010) from about 135-132 Ma (Gomes & Vasconcelos, 2021;Macêdo Filho et al, 2023). The central segment is characterized by Aptian salt basins, and plate reconstructions suggest that break-up occurred at the Aptian-Albian boundary (113 Ma), with the end of the salt deposition (Moulin et al, 2010).…”

Section: 1029/2023tc008184mentioning

confidence: 99%

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The Tectonic Structure and Evolution of the Potiguar‐Ceará Rifted Margin of Brazil

Fonseca,

Ranero,

Vannucchi

et al. 2024

Tectonics

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The Brazilian Equatorial Margin (BEM) is interpreted as a transform margin, where the last segment opened during Gondwana rifting. However, margin evolution, and break‐up age remain unconstrained. We interpret >10k km of crustal‐scale seismic images extending along ∼600 km of the margin calibrated with drillholes. We determine the style and timing of tectonics across the rift system. We link changes in crustal‐scale structure and age of sediment deposits to interpret variations with the style of extension and intensity of thinning across the BEM. Observations support a rift evolution where deformation is initially distributed forming a shallow basin, subsequently focusses, and later migrates basin‐ward forming the deep‐water domain. We interpret that tectonic activity started ∼140–136 Ma and stopped earlier in the shallow basin causing minor thinning, than in the deep‐water domain with a ∼60 km wide area with 4–8 km thick crust extended in Late Aptian to Early Albian (116–110 Ma). Constraints from seismic and drilling help define an abrupt continent to ocean transition (COT) where continental crust may be abutted by oceanic crust, and breakup occurred at early Albian time. Basin sedimentation from the onset to the Late Aptian is continental, indicating an isolated environment disconnected from Atlantic oceans. During late‐most Aptian to Early Albian basin sedimentation changes and indicates a comparatively rapid marine water infill. Rifting of the BEM is not dominated by transcurrent deformation as previously inferred, with strike‐slip faulting limited to comparatively small sectors, whereas most of the margin extended by normal faulting deformation.

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Aptian flood basalts in Bacalhau oil and gas field: petrogenesis and geodynamics of post-rift tholeiites in the pre-salt sequence of Santos Basin, Brazil

Louback

Valente²,

Almeida³

et al. 2023

Contrib Mineral Petrol

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Correlations among large igneous provinces related to the West Gondwana breakup: A geochemical database reappraisal of Early Cretaceous plumbing systems

Cited by 8 publications

References 153 publications

New U–Pb geochronology for the Central Atlantic Magmatic Province, critical reevaluation of high-precision ages and their impact on the end-Triassic extinction event

New U–Pb geochronology for the Central Atlantic Magmatic Province, critical reevaluation of high-precision ages and their impact on the end-Triassic extinction event

The Tectonic Structure and Evolution of the Potiguar‐Ceará Rifted Margin of Brazil

Aptian flood basalts in Bacalhau oil and gas field: petrogenesis and geodynamics of post-rift tholeiites in the pre-salt sequence of Santos Basin, Brazil

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