This new paper written with a large number of colleagues from the IODP-ICDP expedition 364 describes how the Chicxulub impact vaporized sediments from the target rock and injected a large volume of S-rich components into the atmosphere leading to the mass extinction. AMGC researchers used micro-XRF analyses to demonstrate the absence of S-rich material in the core drilled within the crater peak-ring
The image on the left shows the diversity of material recovered in the cores, but no S-rich sediment is preserved.
This PNAS articles made de news all around the world, see below. Also check Brussels Science webpage (in Dutch); http://dailyscience.brussels/nl/steenanalyse-uit-megakrater-geeft-unieke...
Or VUB Today http://vubtoday.com/en/content/vub-researchers-achieve-breakthrough-stud...