Major Early-Middle Devonian oceanic ...
Type de document :
Compte-rendu et recension critique d'ouvrage
Titre :
Major Early-Middle Devonian oceanic oxygenation linked to early land plant evolution detected using high-resolution U isotopes of marine limestones
Auteur(s) :
Elrick, Maya [Auteur]
The University of New Mexico [Albuquerque]
Gilleaudeau, Geoffrey [Auteur]
George Mason University [Fairfax]
Romaniello, Stephen [Auteur]
The University of Tennessee [Knoxville]
Algeo, Thomas [Auteur]
University of Cincinnati [UC]
Morford, Jennifer [Auteur]
Sabbatino, Monia [Auteur]
Università degli studi di Trieste = University of Trieste
Goepfert, Tyler [Auteur]
Cleal, Christopher [Auteur]
Cascales Minana, Francisco De Borja [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Chernyavskiy, Pavel [Auteur]
The University of New Mexico [Albuquerque]
Gilleaudeau, Geoffrey [Auteur]
George Mason University [Fairfax]
Romaniello, Stephen [Auteur]
The University of Tennessee [Knoxville]
Algeo, Thomas [Auteur]
University of Cincinnati [UC]
Morford, Jennifer [Auteur]
Sabbatino, Monia [Auteur]
Università degli studi di Trieste = University of Trieste
Goepfert, Tyler [Auteur]
Cleal, Christopher [Auteur]
Cascales Minana, Francisco De Borja [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Chernyavskiy, Pavel [Auteur]
Titre de la revue :
Earth and Planetary Science Letters
Pagination :
117410
Éditeur :
Elsevier
Date de publication :
2022
ISSN :
0012-821X
Mot(s)-clé(s) en anglais :
euxinia
seawater redox
middle Paleozoic
terrestrialization
seawater redox
middle Paleozoic
terrestrialization
Discipline(s) HAL :
Planète et Univers [physics]/Océan, Atmosphère
Planète et Univers [physics]/Sciences de la Terre/Climatologie
Planète et Univers [physics]/Sciences de la Terre/Paléontologie
Planète et Univers [physics]/Sciences de la Terre/Climatologie
Planète et Univers [physics]/Sciences de la Terre/Paléontologie
Résumé en anglais : [en]
The middle Paleozoic (∼420-350 Myr) records a major increase in ocean-atmosphere oxygen levels; however, the timing and pattern of oxygenation are poorly constrained. Two well-dated North American locations in Nevada and ...
Lire la suite >The middle Paleozoic (∼420-350 Myr) records a major increase in ocean-atmosphere oxygen levels; however, the timing and pattern of oxygenation are poorly constrained. Two well-dated North American locations in Nevada and Illinois were used to generate a high-resolution U-isotopic profile (δ 238 U) spanning ∼70 Myr of the middle Paleozoic. Stratigraphic and geochemical data support the interpretation that the Nevada profile represents a near-primary record of global-ocean redox variations. First-order δ 238 U trends indicate strongly reducing oceans during the late Silurian and Early Devonian, terminated by a major oxygenation event near the Emsian-Eifelian boundary (∼395 Ma). More oxic seawater conditions persisted for the next 30+ Myr, but were punctuated by multiple Myr-scale anoxic events during the Middle-Late Devonian and Early Mississippian that correlate with known global biotic crises, positive δ 13 C excursions, and widespread organic-rich facies deposition. The timing of the ∼395 Ma oxygenation event suggests that the O 2 rise was the result of increased photosynthesis and organic carbon burial linked to diversification of late Silurian to earliest Middle Devonian terrestrial plants, rather than to subsequent Devonian increases in terrestrial plant root depth, tree height, lignin content, or seed reproduction. These findings demonstrate that early colonization of continents by relatively small, shallowly rooted plants with geographically limited ranges was sufficient to drive long-term oxygenation of the ocean-atmosphere system, paving the way for the evolution of large, mobile animals that have dominated the Earth's surface since the middle Paleozoic.Lire moins >
Lire la suite >The middle Paleozoic (∼420-350 Myr) records a major increase in ocean-atmosphere oxygen levels; however, the timing and pattern of oxygenation are poorly constrained. Two well-dated North American locations in Nevada and Illinois were used to generate a high-resolution U-isotopic profile (δ 238 U) spanning ∼70 Myr of the middle Paleozoic. Stratigraphic and geochemical data support the interpretation that the Nevada profile represents a near-primary record of global-ocean redox variations. First-order δ 238 U trends indicate strongly reducing oceans during the late Silurian and Early Devonian, terminated by a major oxygenation event near the Emsian-Eifelian boundary (∼395 Ma). More oxic seawater conditions persisted for the next 30+ Myr, but were punctuated by multiple Myr-scale anoxic events during the Middle-Late Devonian and Early Mississippian that correlate with known global biotic crises, positive δ 13 C excursions, and widespread organic-rich facies deposition. The timing of the ∼395 Ma oxygenation event suggests that the O 2 rise was the result of increased photosynthesis and organic carbon burial linked to diversification of late Silurian to earliest Middle Devonian terrestrial plants, rather than to subsequent Devonian increases in terrestrial plant root depth, tree height, lignin content, or seed reproduction. These findings demonstrate that early colonization of continents by relatively small, shallowly rooted plants with geographically limited ranges was sufficient to drive long-term oxygenation of the ocean-atmosphere system, paving the way for the evolution of large, mobile animals that have dominated the Earth's surface since the middle Paleozoic.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Projet ANR :
Source :
Fichiers
- https://hal.archives-ouvertes.fr/hal-03781208/document
- Accès libre
- Accéder au document
- https://hal.archives-ouvertes.fr/hal-03781208/document
- Accès libre
- Accéder au document
- document
- Accès libre
- Accéder au document
- Elrick%20et%20al.%202022_Earth%20Planet%20Sci%20Lett.pdf
- Accès libre
- Accéder au document