Thackeray syllogism links Younger Dryas onset to combined impact and volcanic activity

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Thackeray syllogism links Younger Dryas onset to combined impact and volcanic activity. Syllogism proposes: platinum peak is close in time to onset of Younger Dryas cooling (OYD); sulfate spike from volcanic activity is also close in time to OYD; therefore platinum peak is close in time to sulfate spike Charlotte Green et al. (2024) claimed volcanic sulfate spike occurred 45 years before platinum spike in Greenland ice core Thackeray and Chris Moore independently question the dating precision of this correlation

Thackeray proposes a syllogism linking the Younger Dryas onset to combined extraterrestrial and volcanic activity. Charlotte Green et al. 2025 claimed a sulfate spike occurred 45 years before the platinum spike, but Thackeray and Moore question this dating precision. Mechanism: impacts could trigger volcanism via seismic shock waves.

Key Facts

Syllogism proposes: platinum peak is close in time to onset of Younger Dryas cooling (OYD); sulfate spike from volcanic activity is also close in time to OYD; therefore platinum peak is close in time to sulfate spike
Charlotte Green et al. (2024) claimed volcanic sulfate spike occurred 45 years before platinum spike in Greenland ice core
Thackeray and Chris Moore independently question the dating precision of this correlation
Proposed mechanism: extraterrestrial impacts may trigger volcanic activity through shock waves and seismic tremors releasing pressure on deep magma, potentially within a day
Forthcoming paper titled "The onset of the Younger Dryas cooling episode, extraterrestrial impact and/or volcanic eruptions" to be published by South African Archaeological Society

Source: The Younger Dryas Impact Evidence Has Reached Africa by The Cosmic Summit