A grueling journey across the ice sheets of Greenland has paid off for a team of scientists, who have located some diamonds in the rough glacial climate.
The 21-person team, which included UCSB professor emeritus James Kennett and his son, University of Oregon geology professor Douglas Kennett, recently published a paper in the Journal of Glaciology on their discovery of nano-sized diamonds in the ice sheet in a location near the city of Kangerlussuaq.
According to James Kennett, the expedition involved traversing a good amount of difficult terrain, as the ice sheets of Greenland are significantly remote.
“The area is cold, remote and [mostly] inaccessible,” James Kennett said. “Looking for a potential layer of diamonds in an ice sheet is like trying to find a needle in a haystack.”
The results provide more evidence for the controversial hypothesis that a comet struck the Earth approximately 12,900 years ago, causing massive changes to the climate and resulting in the mass extinction of approximately 35 mammal species, 19 bird species, and the human Clovis culture of North America.
The nanodiamonds were found in the Younger Dryas Boundary, or YDB, layer, which dates to the approximate time of the comet impact and has been of great interest to Kennett and his team. The Greenland expedition is a continuation of the team’s research, which included a find of the nanodiamonds in the YDB layer on Santa Rosa Island, providing scientists with a better look into the state of the planet at the time.
The nanodiamonds were also found with hexagonal diamonds, which have only been known to form as a result of the intense conditions produced by a cosmic impact — such as one produced by a comet colliding with the Earth.
In addition to their findings, the team was the first to locate free diamonds within a glacial ice sheet.
“The most exciting thing that has emerged from this expedition is that we have discovered free diamonds in glacial ice for the first time on Earth,” Kennett said.
The expedition, which occurred in 2008, was organized by researchers from the University of Maine. Kennett has recently returned from another expedition to Greenland in August, and his team is currently processing the samples collected from the trip to find more evidence of the comet collision and determine the ecological conditions of the Earth 12,900 years ago.