Thermal erosion of cratonic lithosphere as a potential trigger for mass-extinction

Détails

ID Serval
serval:BIB_052BFC582B8E
Type
Article: article d'un périodique ou d'un magazine.
Sous-type
Compte-rendu: analyse d'une oeuvre publiée.
Collection
Publications
Titre
Thermal erosion of cratonic lithosphere as a potential trigger for mass-extinction
Périodique
Scientific Reports
Auteur(s)
Guex J., Pilet S., Müntener O., Bartolini A., Spangenberg J., Schoene B., Sell B., Schaltegger U.
ISSN
2045-2322
Statut éditorial
Publié
Date de publication
24/03/2016
Volume
6
Pages
23168
Langue
anglais
Résumé
The temporal coincidence between large igneous provinces (LIPs) and mass extinctions has led many to pose a causal relationship between the two. However, there is still no consensus on a mechanistic model that explains how magmatism leads to the turnover of terrestrial and marine plants, invertebrates and vertebrates. Here we present a synthesis of ammonite biostratigraphy, isotopic data and high precision U-Pb zircon dates from the Triassic-Jurassic (T-J) and Pliensbachian-Toarcian (Pl-To) boundaries demonstrating that these biotic crises are both associated with rapid change from an initial cool period to greenhouse conditions. We explain these transitions as a result of changing gas species emitted during the progressive thermal erosion of cratonic lithosphere by plume activity or internal heating of the lithosphere. Our petrological model for LIP magmatism argues that initial gas emission was dominated by sulfur liberated from sulfide-bearing cratonic lithosphere before CO2 became the dominant gas. This model offers an explanation of why LIPs erupted through oceanic lithosphere are not associated with climatic and biotic crises comparable to LIPs emitted through cratonic lithosphere.
Site de l'éditeur
Open Access
Oui
Création de la notice
14/03/2017 10:34
Dernière modification de la notice
20/08/2019 13:26
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