Geochemical characterization of the organic matter in the Devonian Pimenteiras Formation, Parnaiba Basin, Brazil – Implications for depositional environment and the potential of hydrocarbon generation

Mussa, Agostinho; Kalkreuth, W.; Mizusaki, Ana Maria Pimentel; Bicca, Marcos Müller; Bojesen‐Koefoed, Jørgen A.

doi:10.1016/j.petrol.2021.108461

Cited by 9 publications

(3 citation statements)

References 16 publications

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“…The Parnaíba Basin presents a similar feature to the other two Brazilian basins, where mafic sills can extend continually for 200 km, have an estimated maximum thickness of ca 500 m 56 , 57 , and intrude the Canindé (fine sandstone, siltites and black shales), Serra Grande (sandstone and shales), and Balsas (clastic-evaporitic complex) groups 57 . The Pimenteiras Formation (Canindé Group) has more than 500 m in thickness and is composed of dark shales rich in organic matter 58 , 59 , where total organic carbon reaches up to 16.60 wt.%, while rock–eval pyrolysis was measured to a high of 51.43 mm HC/g 59 . Additionally, vitrinite reflectance values show an increase in T max (451 °C) and the presence of talc, chlorite and illite can be associated with the thermal influence of igneous intrusions 58 , 59 .…”

Section: Discussionmentioning

confidence: 99%

“…The Pimenteiras Formation (Canindé Group) has more than 500 m in thickness and is composed of dark shales rich in organic matter 58 , 59 , where total organic carbon reaches up to 16.60 wt.%, while rock–eval pyrolysis was measured to a high of 51.43 mm HC/g 59 . Additionally, vitrinite reflectance values show an increase in T max (451 °C) and the presence of talc, chlorite and illite can be associated with the thermal influence of igneous intrusions 58 , 59 . Overall, there is a direct correlation between hydrocarbon generation and magmatic events in the Parnaíba Basin 56 , 58 – 60 .…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, vitrinite reflectance values show an increase in T max (451 °C) and the presence of talc, chlorite and illite can be associated with the thermal influence of igneous intrusions 58 , 59 . Overall, there is a direct correlation between hydrocarbon generation and magmatic events in the Parnaíba Basin 56 , 58 – 60 .…”

Section: Discussionmentioning

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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