The Role of Volcanoes and Asteroids in the Extinction of Dinosaurs


As children, we often imagine the extinction of dinosaurs as a single catastrophic event, typically involving a massive asteroid hurtling toward Earth. However, recent scientific research suggests that the story may be more complex than that. Although the asteroid impact certainly played a significant role, a growing body of geological evidence indicates that relentless volcanic activity might have set the stage for this mass extinction.

“Sometimes the smallest things can turn our world upside down.”

The Backdrop of Extinction: Volcanism and Climate Chaos

The relentless volcanic activity in India’s Deccan Traps that spanned 800,000 years—300,000 years before the asteroid impact and 500,000 years after—emitted vast clouds of carbon dioxide (CO2) and sulfur dioxide (SO2). This prolonged period of volcanism might have created a climatic seesaw that pushed many species towards extinction.

Alexander Cox, a computational geologist at Dartmouth College, argues that the evidence supports the idea that “volcanism was disturbing the atmosphere and the climate way before the asteroid.” The extensive volcanic activity could have created the environmental conditions that led to a dinosaur extinction, regardless of the asteroid impact.

However, the story continues. The asteroid, when it finally hit, intensified the ongoing climate crisis.

The Coup de Grâce: The Asteroid Impact

The asteroid impact, which occurred around 66 million years ago on the coast of the Yucatán Peninsula, instantly obliterated nearby organisms and filled the sky with material that plunged the planet into a species-dooming winter. The aftermath of the asteroid impact was so intense that it may have triggered more volcanic activity at the Deccan Traps, fueling the already raging fire of climatic chaos.

Paul Renne, director of the Berkeley Geochronology Center, explains that the asteroid’s impact released so much energy that it could have jostled the plumbing in the volcanoes, driving magma to the surface. “When you perturb that system violently, you can do several things, one of which is you induce gases to be released from the liquid. That triggers eruptions,” says Renne.

The Aftermath: A World Forever Changed

Following the asteroid impact, the Earth was enveloped in a haze that blotted out the sun. The sudden shift from a gradually heating planet to a sudden, drastic cooling caused by the asteroid’s impact led to a full-tilt climate anarchy. The effects of this climatic chaos and the ongoing volcanic activity caused a mass extinction that wiped out the dinosaurs.

“The Deccan Traps are still erupting after that event,” says Jennifer Kasbohm, a geochronologist at Yale University. “It was a terrible day, but things continue to be rough on planet Earth for a few hundred thousand years more. And then maybe you’re returning to normal, although missing some of your old friends, in terms of species that used to be around.”

In sum, the extinction of dinosaurs was not a single event but rather a series of catastrophic occurrences that drastically altered the Earth’s climate. This new perspective subtly adds to the longstanding debate on the cause of dinosaur extinction. It highlights the need for further research into the nuanced relationship between volcanism and asteroid impact and underscores the critical issue of climate change in species survival.



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