Thackeray argues a speculative impact–volcanism link to the Younger Dryas

Thackeray argues that if the Younger Dryas onset, Greenland platinum peak and volcanic sulfate spike are each close in time, the platinum and sulfate peaks should also be close together. Green et al. (2024), not 2025, dated the sulfate spike about 45 years before the platinum spike; Thackeray and Chris Moore question whether the chronology can resolve that gap. Thackeray’s proposed mechanism—an extraterrestrial impact triggering volcanism through seismic shocks and magma decompression, potentially within a day—is speculative, not an established cause. A forthcoming South African Archaeological Society paper is titled “The onset of the Younger Dryas cooling episode, extraterrestrial impact and/or volcanic eruptions.”