Volcanic Fissures Displace Cosmic Impact Theory as Cause of Ancient Greenland Platinum Spike and Climate Shift

New research proves a 12,800-year-old platinum spike in Greenland came from Icelandic volcanoes, debunking the theory of a catastrophic comet impact.

By: AXL Media

Published: Mar 20, 2026, 11:09 AM EDT

Source: Information for this report was sourced from The Conversation

The Deconstruction of a Cosmic Catastrophe Theory

For years, a sharp concentration of platinum buried deep within the Greenland ice sheet served as the cornerstone for the Younger Dryas Impact Hypothesis, which proposed that a comet or asteroid decimated the northern hemisphere. However, a comprehensive study published in The Conversation indicates that this chemical anomaly is actually terrestrial in origin. By re-examining ice core cylinders dating back nearly 13,000 years, scientists have found that the platinum signature lacks the iridium levels typically associated with extraterrestrial debris. This shift in perspective suggests that the dramatic cooling event, which returned the Earth to glacial conditions, was likely driven by the planet’s own internal geological volatility.

Disproving the Laacher See Volcanic Connection

In a quest to identify the specific source of the platinum, researchers initially turned their attention to the Laacher See eruption in modern day Germany, a massive volcanic event that occurred around the same period. By analyzing 17 samples of volcanic pumice from the region, the team built a detailed chemical fingerprint to compare against the Greenland ice samples. The results were definitive, showing that the German pumice contained virtually no platinum. This finding eliminated the Laacher See eruption as the source of the specific platinum spike, forcing scientists to look further north toward the unique volcanic systems of Iceland.

Chronological Evidence Challenges the Impact Timeline

One of the most significant blows to the comet theory comes from updated dating techniques that place the platinum spike approximately 45 years after the Younger Dryas cooling had already commenced. For a meteorite or comet to have triggered the climate shift, the chemical evidence would need to appear at the exact onset of the temperature drop. Instead, the 14 year duration of the elevated platinum levels suggests a sustained environmental process, such as a long lived volcanic fissure eruption, rather than the instantaneous flash of a cosmic collision. This chronological gap confirms that while the platinum event was significant, it was a consequence or a secondary development rather than the initial cause.