Diamonds are evidence of a cooler ancient Earth
Today’s Video of the Day from the Queensland University of Technology (QUT) describes a new theory that the Earth’s upper mantle was a lot cooler 2.5 billion years ago than previously thought.
The researchers studied thousands of volcanic rocks from around the world to analyze their magnesium oxide levels.
While scientists have traditionally believed that the Earth’s mantle was much hotter up until 2.5 billion years ago, the results of the QUT analysis suggest that the upper mantle was no hotter than it is today.
The cool upper mantle theory helps to explain how diamonds formed in the upper mantle, which would have otherwise turned out to be lumps of graphite.
Video Credit: Queensland University of Technology