Geochemical evidence for volcanic signatures in sediments of the Younger Dryas event

•Absence of Os isotope and highly siderophile element evidence of extraterrestrial input for the Younger Dryas sediments.•Unradiogenic Os isotope ratios and highly siderophile element concentrations fingerprint volcanic aerosols.•Correlated unradiogenic Os peaks supports the proposed distant and episodic volcanic mechanisms for the Younger Dryas event.