The Case of the Missing Diamonds and the Younger Dryas Impact

The Science paper argued that a shower of exploding comet fragments over the North American ice sheet had triggered a sudden climate reversal called the Younger Dryas. Having read the paper, Daulton told the reporter, “It looks interesting, [but] there’s not enough information in this paper to say whether they found diamonds.”

Since then, Daulton has periodically been asked to evaluate Younger Dryas sediments for nanodiamonds. In the issue of the Journal of Quaternary Science released online Dec.19, he reviews the accumulated evidence and reports on his own analysis of new samples from California and Belgium.

For the second time in 10 years, Daulton has carefully reviewed the evidence, and found no evidence for a spike in nanodiamond concentration in Younger Dryas sediments. Since nanodiamonds are the strongest piece of evidence for the impact hypothesis, their absence effectively discredits it.

And so a great idea apparently has been brought low by the humblest of evidence.

What went wrong?

Nanodiamonds, it bears emphasizing, are tiny — smaller than bacteria. Impact supporters often claim to find them inside small spheres of carbon, and those spheres are about the size of the period at the end of this sentence.

Even so, how is it possible for some scientists to find diamonds in samples and others to find none? One answer is that carbon atoms can arrange themselves in many different configurations. These arrangements, which make the difference between pencil lead and diamond, can be confused with one another.
 

Credit: Hiroaki Ohfuji et al.

Impact supporters often claim to have found lonsdaleite, a rare form of diamond that has a hexagonal rather than the common, cubic atomic structure. “Lonsdaleite is usually reported in the literature associated with impact sites or in meteorites that were shock processed,” Daulton said. “It can also be formed by detonation in the laboratory, so the presence of lonsdaleite to me would be a strong suggestion of an impact.”

But when he examined Younger Dryas samples reported to contain lonsdaleite, Daulton couldn’t find it. Instead, he found aggregates of single-atom-thick sheets of carbon atoms (graphene) and sheets of carbon atoms with attached hydrogen atoms (graphane) that looked “very, very similar to lonsdaleite.” So the claim of lonsdaleite was based on a misidentification: Daulton published this result in 2010.

End of story? Not so fast.

In 2014, a group of researchers reported that they had found a nanodiamond-rich sediment layer that spanned three continents. While claiming to find cubic and hexagonal diamond, they also claimed to find much more abundant n-diamond, a controversial form of diamond characterized by electron diffraction patterns similar to diamond, but with extra “forbidden” reflections that diamond does not exhibit.