Abstract
CSDP core Yaxcopoil-1 was drilled to a depth of 1,511 m within the Chicxulub crater. An organic-rich marly limestone near the base of the hole (1,495 to 1,452 m) was deposited in an open marine shelf environment during the latest Cenomanian (uppermost Rotalipora cushmani zone). The overlying sequence of limestones, dolomites and anhydrites (1,495 to 894 m) indicates deposition in various carbonate platform environments (e.g., sabkhas, lagoons). A 100-m-thick suevite breccia (894–794 m) identifies the Chicxulub impact event. Above the suevite breccia is a dolomitic limestone with planktic foraminiferal assemblages indicative of Plummerita hantkeninoides zone CF1, which spans the last 300 ky of the Maastrichtian. An erosional surface 50 cm above the breccia/dolomite contact marks the K/T boundary and a hiatus. Limestones above this contact contain the first Tertiary planktic foraminifera indicative of an upper P. eugubina zone P1a(2) age. Another hiatus 7 cm upsection separates zone P1a(2) and hemipelagic limestones of planktic foraminiferal Zone P1c. Planktic foraminiferal assemblages of Zone Plc to P3b age are present from a depth of 794.04 up to 775 m. The Cretaceous carbonate sequence appears to be autochthonous, with a stratigraphic sequence comparable to late Cretaceous sediments known from outside the Chicxulub crater in northern and southern Yucatan, including the late Cenomanian organic-rich marly limestone. There is no evidence that these sediments represent crater infill due to megablocks sliding into the crater, such as major disruption of sediments, chaotic changes in lithology, overturned or deep dipping megablocks, major mechanical fragmentation, shock or thermal alteration, or ductile deformation. Breccia units that are intercalated in the carbonate platform sequence are intraformational in origin (e.g., dissolution of evaporites) and dykes are rare. Major disturbances of strata by the impact therefore appear to have been confined to within less than 60 km from the proposed impact center. Yaxcopoil-1 may be located outside the collapsed transient crater cavity, either on the upper end of an elevated and tilted horst of the terrace zone, or even outside the annular crater cavity. The Chicxulub site thus records a large impact that predates the K/T boundary impact and mass extinction.
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Acknowledgements
We gratefully acknowledge access to the Yaxcopoil-1 core and logistic support during on site core analysis by the Instituto de Geofísica of the Universidad Nacional Autónoma de México.
This study has benefited from critical comments and suggestions by reviewer Paul Wignall and from discussions with A. Schafhauser, M. Caron, J.G. Lopez-Oliva, O. Morton and J. Urrutia-Fucugauchi. We thank M. Dadras (Institut de Microtechnique, Neuchâtel University, Switzerland for ESEM-EDX analyses. Research was supported by the German Science Foundation grants STI 128/7-1 to 3 (WS), and STU 169/10-1 to 3 (DS), the US NSF grant EAR-0207407 (GK), and the Swiss National Fund No. 8220-028367 (TA).
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Stinnesbeck, W., Keller, G., Adatte, T. et al. Yaxcopoil-1 and the Chicxulub impact. Int J Earth Sci (Geol Rundsch) 93, 1042–1065 (2004). https://doi.org/10.1007/s00531-004-0431-6
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DOI: https://doi.org/10.1007/s00531-004-0431-6