Mass wasting of Atlantic continental margins following the Chicxulub impact event

Author(s): Norris, R. D.; Firth, J. V.
Author Affiliation(s): Primary:
Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Other:
University of Missouri-Columbia, United States
Ocean Drilling Program, United States
Volume Title: Catastrophic events and mass extinctions; impacts and beyond
Volume Author(s): Koeberl, Christian, editor; MacLeod, Kenneth G.
Source: Catastrophic events and mass extinctions; impacts and beyond, edited by Christian Koeberl and Kenneth G. MacLeod. Special Paper - Geological Society of America, Vol.356, p.79-95. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0072-1077. ISBN: 1-8137-2356-6 CODEN: GSAPAZ
Note: In English. 68 refs.; illus., incl. sects., strat. cols., sketch map
Summary: The Chicxulub impact 65 Ma triggered massive submarine failure of continental margins around the North Atlantic. Slumped sediments associated with impact ejecta and geochemical tracers of the bolide are present on the Blake Plateau, the mid-Atlantic continental slope and rise, Bermuda Rise, and the Iberian Abyssal Plain more than 6000 km from the impact crater. Evidence from deep-sea drilling and seismic stratigraphy suggests that much of the eastern seaboard of North America and at least parts of the eastern margin of the North Atlantic must have failed catastrophically because of the ∼10-13 magnitude earthquake associated with the impact event, and created one of the largest, composite mass-wasting deposits on Earth. We infer that mass failure of the eastern margin of North America can account for elevated extinction rates and delayed recovery of North American invertebrates compared to other places during the Cretaceous-Paleogene mass extinction. Slumping on the margins also redeposited large volumes of carbonates into the deep sea below the Cretaceous carbonate compensation depth (CCD), giving the false impression of a drop in the CCD during the Maastrichtian.
Year of Publication: 2002
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Bermuda Rise; Blake Plateau; Cenozoic; Chicxulub Crater; Continental margin; Cretaceous; DSDP Site 385; DSDP Site 386; DSDP Site 387; DSDP Site 603; Deep Sea Drilling Project; Dinoflagellata; Earthquakes; Eastern North America; Extinction; Foraminifera; IPOD; Iberian abyssal plain; Impact craters; Impact features; Invertebrata; K-T boundary; Leg 171B; Leg 43; Leg 93; Leg 95; Lower Paleocene; Magnitude; Mass extinctions; Mass movements; Mesozoic; Mexico; Microfossils; North America; North Atlantic; Northeast Atlantic; ODP Site 1049; ODP Site 1050; ODP Site 1052; Ocean Drilling Program; Paleocene; Paleogene; Palynomorphs; Plantae; Protista; Rates; Slumping; Stratigraphic boundary; Tertiary; Upper Cretaceous; Yucatan Peninsula
Coordinates: N352939 N352940 W0700142 W0700143
N295500 N300900 W0760600 W0763800
N310000 N410000 W0510000 W0680000
N352939 N384432 W0700142 W0723633
N352900 N384930 W0700100 W0724700
Record ID: 2002073203
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