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Geology; April 2000; v. 28; no. 4; p. 319-322; DOI: 10.1130/0091-7613(2000)28<319:IMWATK>2.0.CO;2
© 2000 Geological Society of America
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Impact-induced mass wasting at the K-T boundary: Blake Nose, western North Atlantic

Adam Klaus*,1, Richard D. Norris*,2, Dick Kroon*,3 and Jan Smit*,4

1 Ocean Drilling Program and Department of Oceanography, Texas A&M University, 1000 Discovery Drive, College Station, Texas 77845, USA
2 Mail Stop 23, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA
3 Department of Geology and Geophysics, University of Edinburgh, Edinburgh, Scotland
4 Department of Sedimentology, Faculty of Earth Sciences, Vrije Universiteit, de Boelelaan 1085, 1081HV Amsterdam, Netherlands

Seismic reflection data combined with results from ocean drilling document regional-scale slumping associated with the Cretaceous-Tertiary (K-T) impact event. The K-T boundary is biostratigraphically complete at three Ocean Drilling Program sites (1049, 1050, and 1052) located on Blake Nose (30°N, 75°W) off eastern Florida in water depths of 1300–2600 m. Maastrichtian chalk is folded and fractured below the K-T boundary at all three sites, whereas lowermost Paleocene clays and chalks are undeformed. Deformation is pervasive in Maastrichtian at the deepest water site (Site 1049), whereas at the shallower water sites (Sites 1050 and 1052) thick intervals of structurally intact Maastrichtian chalk are separated by thinner intervals of highly deformed sediments. Correlation of core to seismic reflection data indicates that the K-T boundary immediately overlies seismic facies characteristic of mass wasting that extend across most of the ~55 km distance of the depth transect. Maastrichtian sediments appear to have moved as large slump blocks on the upper part of Blake Nose but deformed more uniformly in the deeper water parts of the transect. We suggest that mass wasting occurred on the Blake Nose >1600 km from the Chicxulub crater in response to the cataclysmic seismicity generated by the impact.

Key Words: K-T boundary • Cretaceous-Tertiary boundary • mass wasting • slumps




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