Earth's first continents may have emerged from the oceans roughly 750 million years earlier than previously thought, rising from the seas in a manner completely unlike modern continents. Via InsideScience.
Wikus De Wet/AFP via Getty ImagesEarth's first continents may have emerged from the oceans roughly 750 million years earlier than previously thought, rising from the seas in a manner completely unlike modern continents. These early masses of solid rock may have floated buoyantly atop magma welling up from below, a new study finds.
When and how Earth's earliest continents, the cratons, first rose above the oceans remains uncertain. Previous research suggested this emergence began roughly 2.5 billion years ago and was driven by plate tectonics -- the drifting, crashing and diving of the giant plates of rock that now make up Earth's surface.
The new work suggests Earth's cratons first started emerging up to 3.3 billion years ago, roughly three-quarters of a billion years earlier that most prior models predicted. In addition, the researchers noted that plate tectonics likely did not play a major role in the rise of these cratons.
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