“It doesn’t alter our theory of what caused the extinction event—but it makes it less likely that sulphur contained in the impactor was the smoking gun,” co-author Philippe Claeys, a planetary scientist and professor at the Free University of Brussels in Belgium, said in a statement. “The fine debris thrown into the atmosphere would have [been] the primary factor.”

https://gizmodo.com/the-asteroid-that-killed-the-dinosaurs-may-not-have-done-it-exactly-how-we-thought-2000787712

How would they distinguish bolide sourced sulphur from the oto 10¹⁴ kg of SO₂ estimated to have been sourced from the extensive anhydrite deposits below Chicxulub?

Ref: Emission spectra of a simulated Chicxulub impact-vapor plume at the Cretaceous–Paleogene boundary

Edited 10 hours ago10 hr by sethoflagos

I would think the impact crater itself would have a massive amount of sulfur, but there would be a thin film deposited all over the world at strata corresponding to 65M years.
Then again Sulfur 'melts at 115^o and burns at 200^o, while its dust is explosive, so what would atmospheric entry have done to this 'sulfur' asteroid if it wasn't mostly rock/metal ?