The Toarcian Oceanic Anoxic Event occurred about 183 million years ago during the Early Jurassic period and represents possibly the most extreme case of widespread ocean deoxygenation of the entire Phanerozoic eon. It was triggered by massive volcanic eruptions from the Karoo-Ferrar large igneous province, which released enormous quantities of carbon dioxide, pushing atmospheric levels from roughly 500 to 1,000 parts per million and driving global warming of 3 to 7 degrees Celsius depending on location. The resulting warming intensified weathering, flooding the oceans with nutrients that caused eutrophication and oxygen depletion, devastating brachiopods and corals, of which about 91 percent of Tethyan species vanished, while numerous dinosaur groups and many plant communities on land also suffered losses. The event lasted about 500,000 years, with recovery spanning millions of years afterward.
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Source Toarcian Oceanic Anoxic Event (Wikipedia)
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Source Toarcian Oceanic Anoxic Event (Wikipedia)
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Wikidata: Toarcian Oceanic Anoxic Event
Wikidata Q116446247, class allow-list match (w-wdresolver-0926)View the Source Toarcian Oceanic Anoxic Event (Wikipedia)
In Discipline: Stratigraphy, Lead paragraph
The Toarcian extinction event, also called the Pliensbachian-Toarcian extinction event, the Early Toarcian mass extinction, the Early Toarcian palaeoenvironmental crisis, or the Jenkyns Event, was an extinction event that occurred during the early part of the Toarcian age, approximately 183 million years ago, during the Early Jurassic.
In Group: Mass Extinction Events, Lead sentence
The Toarcian extinction event, also called the Pliensbachian-Toarcian extinction event, the Early Toarcian mass extinction, the Early Toarcian palaeoenvironmental crisis, or the Jenkyns Event, was an extinction event that occurred during the early part of the Toarcian age, approximately 183 million years ago, during
Caused By: Volcanism, Lead sentence
Occurring during the supergreenhouse climate of the Early Toarcian Thermal Maximum (ETTM), the Early Toarcian extinction was associated with large igneous province volcanism, considerable CO2 emissions which elevated global temperatures, acidified the oceans, increased continental weathering and nutrients fluxes
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