‘Superdeep’ diamonds provide new insight into earth’s carbon cycle
Researchers at the University of Bristol have discovered new insights into previously hidden parts of the earth’s carbon cycle. The team found that carbon recycling extends into the deep mantle by plate subduction, but is still primarily constrained to upper mantle depths, above 700km. The researchers made the discovery that certain rare diamonds are formed when carbon that was sequestered from seawater into the Earth’s shifting tectonic plates reacts with the mantle after the plate is subducted – a process by which it moves under another tectonic plate and sinks into the mantle as the plates converge.
