The mafic volcanic climax of the Paraná‐Etendeka Large Igneous Province as the trigger of the Weissert Event

The association between Large Igneous Provinces (LIPs) and mass extinctions and anoxic events is attributed to the radical climatic changes in Earth. Even though the Early Cretaceous Paraná–Etendeka Igneous Province has a comparable erupted volume (>1 Mkm3) to other LIPs (e.g., Deccan, Emeishan a...

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Bibliographic Details
Published in:	Terra nova (Oxford, England) Vol. 34; no. 1; pp. 28 - 36
Main Authors:	Bacha, Rafael R. B., Waichel, Breno L., Ernst, Richard E.
Format:	Journal Article
Language:	English
Published:	Oxford Blackwell Publishing Ltd 01-02-2022
Subjects:	Anoxia Ar‐Ar geochronology Climate change Cretaceous Lava Magma Mass extinctions Parana‐Etendeka Large Igneous Province Valanginian Weissert Event
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Summary:	The association between Large Igneous Provinces (LIPs) and mass extinctions and anoxic events is attributed to the radical climatic changes in Earth. Even though the Early Cretaceous Paraná–Etendeka Igneous Province has a comparable erupted volume (>1 Mkm3) to other LIPs (e.g., Deccan, Emeishan and Siberian Traps), it remains controversial why this LIP did not contribute to a mass extinction and whether it is associated with the Weissert Event. This work presents new 40Ar/39Ar dating over a 425‐m vertical stratigraphic profile (out of 1,000 m) that spans three formations of the PE‐LIP in southern Brazil (low‐Ti Vale do Sol, high‐Ti Urubici, and high‐Ti Palmas). Our data demonstrate that this mafic lava pile was emplaced in c. 2.0 m.y., from c. 135.5 Ma to c. 133.5 Ma, and endorse the hypothesis that the basaltic and andesitic flows of the Vale do Sol Formation (peak of mafic magmatism) contributed to the Weissert Event.
ISSN:	0954-4879 1365-3121
DOI:	10.1111/ter.12558