The Cambrian Explosion – around 541 million years ago – was when life and organisms really got going on planet Earth. Now new research has revealed how that explosion of life has left behind traces deep within Earth's mantle.
– around 541 million years ago – was when life and organisms really got going on planet Earth. Now new research has revealed how that explosion of life has left behind traces deep within Earth's mantle.For scientists, it shows the connected interplay between Earth's surface and what lies beneath, as sediments carrying organic material are pushed under the ground over vast geological timescales throughThe new study looked at rare, diamond-filled volcanic rocks called kimberlites.
Yet here the researchers found a shift in the ratio of specific carbon isotopes around 250 million years ago, about the time that sediment from the Cambrian Explosion would've been folded into the mantle. It's a shift potentially caused by the immense changes in the carbon cycle during a time when the biosphere was increasing in mass and diversity.
It does seem clear though that dead creatures trapped in sediment found their way into the mantle through plate tectonics. Their carbon remains mixed with other material before eventually reaching the surface again through events like volcanic eruptions.
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