The Hirnantian (Late Ordovician) and ...
Document type :
Compte-rendu et recension critique d'ouvrage
DOI :
Title :
The Hirnantian (Late Ordovician) and end-Guadalupian (Middle Permian) mass-extinction events compared
Author(s) :
Isozaki, Yukio [Auteur]
Servais, Thomas [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Servais, Thomas [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Journal title :
LETHAIA
Pages :
173-186
Publisher :
Wiley
Publication date :
2018-04
ISSN :
0024-1164
HAL domain(s) :
Planète et Univers [physics]
English abstract : [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) ...
Show more >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.Show less >
Show more >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.Show less >
Language :
Anglais
Popular science :
Non
Source :