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⁸⁷Sr/⁸⁶Sr test of the degree of impact-induced slope failure in the Maastrichtian of the western North Atlantic

¹ Department of Geological Sciences, University of Missouri, Columbia, Missouri 65211, USA
² Department of Geological Sciences, University of North Carolina, Chapel Hill, North Carolina 27599, USA
³ Department of Paleobiology, Smithsonian Institution, Washington, D.C. 20560, USA

Analyses of ⁸⁷Sr/⁸⁶Sr in foraminifera and sedimentological observations suggest that the Chicxulub impact was not the trigger for slumps or a hiatus within the Maastrichtian section recovered at Ocean Drilling Program Sites 1049, 1050, and 1052 (subtropical western North Atlantic). The slumps and hiatus occur within a sequence dominated by pelagic chalk. The ⁸⁷Sr/⁸⁶Sr measurements show a general increase through the Maastrichtian at each site, but suggest chronostratigraphic gaps on the order of 10⁶ yr across the slumps. Some of the slumps have burrowed upper surfaces and are composed of material that is older and coarser grained than the bounding chalks. Pelagic deposition punctuated by gravity flows easily explains the Maastrichtian record on Blake Nose, whereas an impact-based explanation for slumping is difficult to reconcile with sedimentological and geochemical observations.

Key Words: Cretaceous-Tertiary boundary • strontium isotopes • slump • Maastrichtian • Ocean Drilling Program

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