Here’s what you’ll learn when you read this story:
Experts believe a giant mass of hot rock known as the North Atlantic Anomaly (NAA) is heading toward New York City.
A new study suggests that the NAA could be responsible for the split between Canada and Greenland 80 million years ago.
The recent research adds to previous studies, pointing to a new hypothesis in geological history.
The theory of continental drift was proposed by German meteorologist Alfred Wegener more than a century ago in 1912. According to the theory, the continents we know today were once connected as one big “supercontinent” called Pangea. The theory explains why continental coasts align like puzzle pieces, and why fossils from certain species are found in vastly different places.
Experts suggest that the supercontinent began breaking apart around 200 million years ago—a timeline that has been widely accepted as geological history for decades. But an international research team may be challenging that notion. A new study published in the journal Geology suggests that a giant, hot blob split Greenland from North America 80 million years ago—and now, it’s heading toward New York.
“This thermal upwelling has long been a puzzling feature of North American geology.” lead author of the study Tom Gernon said in a press release. “Our research suggests it’s part of a much larger, slow-moving process deep underground that could potentially help explain why mountain ranges like the Appalachians are still standing.”
The hot zone on which the study focused is a feature called the North Atlantic Anomaly (NAA), residing deep beneath the crust. Experts estimate that the molten rock mass is around 350 kilometers (218 miles) wide, and it currently sits 200 kilometers (124 miles) beneath the Appalachian Mountains in New England.
Using geodynamic simulations, tectonic plate reconstructions, and seismic tomography data, researchers traced the origins of the mass back to the Labrador Sea, where Canada and Greenland began splitting around 80 million years ago. Researchers estimate that the blob migrates at a rate of 20 kilometers (12 miles) per million years. Per the team’s calculations, the mass is steadily heading toward New York City—but Yankees fans, fear not! Experts anticipate the center of the anomaly won’t pass through the Big Apple for the next 15 trillion years.
The study expands on recent research that proposed a new idea called the “mantle wave” theory, which posits that the molten material beneath Earth’s surface behaves almost like a lava lamp. When continents divide, hot, dense rock bubbles off the base of tectonic plates, and the “waves” move across continents’ lower surfaces. Once beneath the base of a continent, the heat from the blob works like the fire in a hot air balloon, making the continent more buoyant. Researchers believe this phenomenon could’ve caused ancient mountains to be “further uplifted” over the past few million years.
“Our earlier research shows that these ‘drips’ of rock can form in series, like domino stones when they fall one after the other, and sequentially migrate over time,” co-author Sascha Brune said in the press release. “The feature we see beneath New England is very likely one of these drips, which originated far from where it now sits.”
Needless to say, this is certainly an example of “slow and steady wins the race”—at least when it comes to forming the continents. According to Gernon, there is still a lot to learn about how the continents came to be arranged in the way we see them today.
“Even though the surface shows little sign of ongoing tectonics, deep below, the consequences of ancient rifting are still playing out,” he explained in the release. “The legacy of continental breakup on other parts of the Earth system may well be far more pervasive and long-lived than we previously realised.”
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