The Younger Dryas saw global temperatures drop by about 10oC in under a year, with cold conditions persisting for roughly 1,200 years. Many scientists attribute this to glacial meltwater disrupting Atlantic Ocean currents, but the Younger Dryas Impact Hypothesis suggests Earth encountered debris from a disintegrating comet, causing impacts that destabilized ice sheets and shut down key currents.
Until now, ocean sediment evidence for the impact theory was lacking. Moore's team analyzed four seafloor cores from Baffin Bay using advanced techniques including scanning electron microscopy, mass spectrometry, and spectroscopy. Radiocarbon dating confirmed the sediments coincided with the onset of the Younger Dryas.
Researchers identified metallic debris with geochemistry matching comet dust, along with microspherules of mainly terrestrial origin but containing some extraterrestrial material. These particles likely formed when comet fragments exploded in the atmosphere or struck Earth, fusing materials together. Nanoparticles enriched in platinum, iridium, nickel, and cobalt - elements often linked to extraterrestrial sources - were also found.
The data reveal a geochemical anomaly at the start of the Younger Dryas, but do not definitively prove an impact. Further studies are needed to confirm the link between the debris and climate change.
Christopher Moore noted: "Our identification of a Younger Dryas impact layer in deep marine sediments underscores the potential of oceanic records to broaden our understanding of this event and its climatological impacts."
Mohammed Baalousha added: "It is great to implement our unique nano-analytical tools in a new area of study, namely the analysis of nanoparticles generated or transported to the Baffin Bay core site during the Younger Dryas. We are always happy to implement our tools to support our colleagues and explore new frontiers."
Vladimir Tselmovich stated: "Collisions of the Earth with comets led to catastrophes leading to climate change, to the death of civilizations. One of these events was a catastrophe that occurred about 12,800 years ago. Having studied in detail the microscopic traces of this disaster in Baffin Bay, we were able to find multiple traces of cometary matter, which was identified by the morphology and composition of the microparticles found. The amount of comet dust in the atmosphere was enough to cause a short-term impact winter, followed by a 1,400-year cooling period. The results obtained confirm the hypothesis that the Earth collided with a large comet about 12,800 years ago."
Research Report:A 12,800-year-old layer with cometary dust, microspherules, and platinum anomaly recorded in multiple cores from Baffin Bay
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