#oxygenation

2025-06-04

Ces résultats remettent en cause ce que l’on savait de l’ des océans il y a plus de 2 milliards d’années sci3nc.es/TL9G6T

Lukas VFN 🇪🇺animalculum@scholar.social
2024-04-06

Ancient #ocean oxygenation timeline revealed
phys.org/news/2024-04-ancient-

Late Paleozoic #oxygenation of marine environments supported by #dolomite U-Pb dating nature.com/articles/s41467-024

"Their record indicates a dramatic increase in the oxygenation of the #oceans during the Late #Paleozoic era, hundreds of millions of years after the emergence of the first #animals. This aligns with other evidence... supports the hypothesis that animals have evolved in oceans that were mostly oxygen-limited"

Rock sample under microscope
Lukas VFN 🇪🇺animalculum@scholar.social
2023-09-25

#Ediacaran #fossils reveal origins of #biomineralization that led to expansion of life on Earth
phys.org/news/2023-09-ediacara

Constraining the onset and environmental setting of #metazoan biomineralization sciencedirect.com/science/arti

"#Cloudina originated in a low #oxygen environment with periods of notably higher #oxygenation... it was not a case of sustained oxygenation that resulted in the appearance of #skeletonization... high #carbonate concentrations in the ocean were necessary"

Schematic interpretation of depositional environments across the study area in Tsau Khaeb National Park, Namibia, during which Cloudina biomineralisation occurred. A) Marine transgression led to deposition of sandstones and siltstones in a shallow shoreface; b) continued marine transgression forming an evaporite basin partially restricted from the open ocean; c) peak sea level with open marine conditions and extensive carbonate deposits; d) sea level fall during which Cloudina biomineralisation occurred in periods of oxygenation
ImaWorldWatcher🌏MeloneyBG@mastodon.world
2023-05-15

Great #Oxygenation #Event, which occurred around 2.4 billion years ago, was one of the biggest #transformations of our planet. Before it, there was practically no oxygen in the #atmosphere; after, there wa. Tthe rise of oxygen is sen as life triumphantly terraforming a passive planet. But we’re learning now that Earth was an active participant, and it took two more big lifts of oxygen over the succeeding #2billionyears before it reached breathable levels.

arstechnica.com/science/2023/0

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