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- From physics org.
" researchers says evidence suggests this mass extinction was not a single event but two, separated by nearly 3 million years.
By studying uranium isotope profiles of marine samples collected in the South China Sea, scientists identified two "pulses" in which the oceans became deprived of oxygen.
https://www.sciencedirect.com/science/article/abs/pii/S0012821X23001413?via%3Dihub
In a study published in the journal Earth and Planetary Science Letters, researchers say their analysis provides evidence that the oxygen-deprived oceans precipitated two mass extinctions around 259 million and 262 million years ago during the Middle Permian Period.
"We are studying the biocrisis in the Permian Period, but similar warming is happening today because of human events," said Thomas Algeo, a study co-author and University of Cincinnati professor of geosciences. "Humans are mimicking the effects of volcanic eruptions as a consequence of the release of carbon into the atmosphere."
The study was led by researcher Huyue Song at the China University of Geosciences, a former postdoctoral researcher at UC.
"Today, we are facing several global change issues, including global warming, ocean hypoxia, seawater acidification and biodiversity decline, which are similar to the environmental changes during the Middle Permian biological crisis interval," Song said."
"We are studying the biocrisis in the Permian Period, but similar warming is happening today because of human events," said Thomas Algeo, a study co-author and University of Cincinnati professor of geosciences. "Humans are mimicking the effects of volcanic eruptions as a consequence of the release of carbon into the atmosphere."
The study was led by researcher Huyue Song at the China University of Geosciences, a former postdoctoral researcher at UC.
"Today, we are facing several global change issues, including global warming, ocean hypoxia, seawater acidification and biodiversity decline, which are similar to the environmental changes during the Middle Permian biological crisis interval," Song said."