The Hirnantian (Late Ordovician) and ...
Type de document :
Compte-rendu et recension critique d'ouvrage
DOI :
Titre :
The Hirnantian (Late Ordovician) and end-Guadalupian (Middle Permian) mass-extinction events compared
Auteur(s) :
Isozaki, Yukio [Auteur]
Servais, Thomas [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Servais, Thomas [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Titre de la revue :
LETHAIA
Pagination :
173-186
Éditeur :
Wiley
Date de publication :
2018-04
ISSN :
0024-1164
Discipline(s) HAL :
Planète et Univers [physics]
Résumé en anglais : [en]
The so-called Big Five mass extinctions of the Phanerozoic include two prominentPalaeozoic episodes: the end-Ordovician and end-Permian events, both with large biodiversityloss. We consider that the end-Ordovician (Hirnantian) ...
Lire la suite >The so-called Big Five mass extinctions of the Phanerozoic include two prominentPalaeozoic episodes: the end-Ordovician and end-Permian events, both with large biodiversityloss. We consider that the end-Ordovician (Hirnantian) extinction could bebest compared to the Middle Permian end-Guadalupian (=Capitanian) extinction,rather than to the end-Permian (Permo-Triassic boundary; PTB) extinction. The end-Guadalupian extinction, ca. 8 Myr before the PTB extinction, occurred as an independentepisode under extremely unique global setting with the lowest sea level and lowestSr isotopic ratios in seawater of the Phanerozoic. Multiple similarities exist betweenthe end-Ordovician (Hirnantian) and the end-Guadalupian (Capitanian) events, suchas the preferential elimination of sessile biota in the tropics, a global sea-level dropand secular changes in seawater C and Sr isotope ratios, occurring under global cooling.The limited development of land vegetation suggests that the Ordovician extinctionwas restricted solely to the marine realm, with no prominent damages on land,and no large igneous province (LIP) recognized in the Ordovician. The comparisonindicates that the two extinctions of the Hirnantian and of the Capitanian have beenessentially triggered by similar causes/processes; nonetheless, biotic responses were different,owing to the more oxygenated status of surface environments in the Permianafter the mid-Palaeozoic terrestrialization. □ Atmospheric oxygen level, Capitanian,carbon isotope, global cooling, Hirnantian, mass extinction, Ordovician, Permian, superchron,terrestrialization.Lire moins >
Lire la suite >The so-called Big Five mass extinctions of the Phanerozoic include two prominentPalaeozoic episodes: the end-Ordovician and end-Permian events, both with large biodiversityloss. We consider that the end-Ordovician (Hirnantian) extinction could bebest compared to the Middle Permian end-Guadalupian (=Capitanian) extinction,rather than to the end-Permian (Permo-Triassic boundary; PTB) extinction. The end-Guadalupian extinction, ca. 8 Myr before the PTB extinction, occurred as an independentepisode under extremely unique global setting with the lowest sea level and lowestSr isotopic ratios in seawater of the Phanerozoic. Multiple similarities exist betweenthe end-Ordovician (Hirnantian) and the end-Guadalupian (Capitanian) events, suchas the preferential elimination of sessile biota in the tropics, a global sea-level dropand secular changes in seawater C and Sr isotope ratios, occurring under global cooling.The limited development of land vegetation suggests that the Ordovician extinctionwas restricted solely to the marine realm, with no prominent damages on land,and no large igneous province (LIP) recognized in the Ordovician. The comparisonindicates that the two extinctions of the Hirnantian and of the Capitanian have beenessentially triggered by similar causes/processes; nonetheless, biotic responses were different,owing to the more oxygenated status of surface environments in the Permianafter the mid-Palaeozoic terrestrialization. □ Atmospheric oxygen level, Capitanian,carbon isotope, global cooling, Hirnantian, mass extinction, Ordovician, Permian, superchron,terrestrialization.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Source :