Chicxulub impact ejecta from the Cretaceous-Paleogene (K-P) boundary in northeastern México
Published:January 01, 2005
Peter Schulte, Agnes Kontny, 2005. "Chicxulub impact ejecta from the Cretaceous-Paleogene (K-P) boundary in northeastern México", Large Meteorite Impacts III, Thomas Kenkmann, Friedrich Hörz, Alex Deutsch
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The combined petrological and rock magnetic study of the Cretaceous-Paleogene (K-P) boundary in northeastern México revealed compositionally and texturally complex Chicxulub ejecta deposits. The predominant silicic ejecta components are Fe-Mg–rich chlorite and Si-Al-K–rich glass spherules with carbonate inclusions and schlieren. Besides these silica phases, the most prominent ejecta component is carbonate. Carbonate occurs as lithic clasts, accretionary lapilli, melt globules (often with quench textures), and as microspar. The composition of the spherules provides evidence for a range of target rocks of mafic to intermediate composition, presumably situated in the northwestern sector of the Chicxulub impact structure. The abundance of carbonate...