Stratospheric sulfur after the Chicxulub impact may have extended climate change, contributing to mass extinction

Closeup of the rocks exposed along Darting Minnow Creek. The round, white ejecta “spherules” condensed out of ejecta plume from the vaporized Chicxulub rocks and rained down on the Earth in the period after the impact. The ejecta materials at Darting Minnow Creek contain the sulfur that was derived from the Chicxulub crater and the sulfur isotope anomalies that confirm the formation of abundant stratospheric sulfur aerosols that caused extended cooling after the impact.

"The impact blast and fallout ignited widespread fires, which together with rock dust, soot and volatiles ejected from the crater, blotted out the sun globally in an impact winter that may have lasted years, resulting in the extinction," says Christopher Junium, an associate professor of Earth and Environmental sciences who leads the Geobiology, Astrobiology, Paleoclimate, Paleoceanography research group in the College of Arts and Sciences at Syracuse University.

Outcrop location containing the K-Pg boundary event deposits in Rosebud, Texas along Darting Minnow Creek, a tributary of the Brazos River.

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