The massive asteroid that slammed into Earth and wiped out the dinosaurs might never have triggered a mass extinction had it struck almost any other part of the planet, scientists claim.
Researchers at Tohoku University has found evidence suggesting that if the asteroid that struck the Earth near Chicxulub 66 million years ago had landed almost anywhere else, it would not have been nearly as destructive. In their paper published in the journal Scientific Reports, Kunio Kaiho and Naga Oshima suggest that had the asteroid struck another part of the planet it is likely the dinosaurs would have survived.
Scientists around the world have reached a consensus regarding the reason that the dinosaurs (except for bird relatives) went extinct—a large asteroid struck the Earth just off what is now the Yucatan peninsula, hurling so much soot and other material into the atmosphere that the planet became too cold (for approximately three years) for the dinosaurs and most other land animals to survive. But now, it appears that they might have survived had the asteroid struck almost anywhere else.
To learn more about the event that had such a huge impact on the history of our planet, Kaiho and Oshima used a computer to analyze multiple data sources surrounding the impact and the location where it struck—the resulting simulation showed how much soot would have been generated based on the amount of hydrocarbon material in the ground near the impact site. Such hydrocarbons would include not just oil or coal deposits, but other rocks that also contained oil—more hydrocarbons would mean more soot and gases making their way into the atmosphere. The research pair also created a map showing surface hydrocarbon densities across the globe at the time.
During the study, Kaiho thought that the amount of soot and temperature anomaly might have been affected by the amount of sedimentary organic-matter. So, he analyzed the amount of sedimentary organic-matter in the Earth to obtain readings of temperature anomaly caused by soot in the stratosphere.
They found that the site where the asteroid struck was particularly dense in hydrocarbons—87 percent of the planet surface was less dense. That means, they claim, that if the asteroid had struck a place where it was less dense (which would have been almost anywhere else), much less soot would have been generated, and thus, the planet would not have cooled as much. And if the planet had not cooled so much, the dinosaurs might have survived, and that might have meant that we humans would never have had a chance to evolve.
Writing in the journal, the scientists argue that stratospheric soot may have been the main driver for the death of the dinosaurs. “The site of asteroid impact, therefore, changed the history of life on Earth,” they add.
Sources: Scientific Reports