Cretaceous-Paleogene boundary exposed; Campeche Escarpment, Gulf of Mexico

Online Access: Get full text
doi: 10.1016/j.margeo.2014.10.002
Author(s): Paull, Charles K.; Caress, David W.; Gwiazda, Roberto; Urrutia-Fucugauchi, Jaime; Rebolledo-Vieyra, Mario; Lundsten, Eve; Anderson, Krystle; Sumner, Esther J.
Author Affiliation(s): Primary:
Monterey Bay Aquarium Research Institute, Moss Landing, CA, United States
Other:
Universidad Nacional Autónoma de México, Mexico
Centro de Investigación Científica de Yucatán, Mexico
Volume Title: Marine Geology
Source: Marine Geology, Vol.357, p.392-400. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. 42 refs.; illus., incl. sketch map
Summary: We present the first multibeam bathymetric maps of the Campeche Escarpment, a Mesozoic carbonate platform in the Gulf of Mexico, which represents the closest Cretaceous-Paleogene (K-Pg) boundary outcrops to the Chicxulub impact structure. The impact of an extraterrestrial-body ∼ 65 million years ago on top of this platform is implicated in the end of the Cretaceous mass extinction and caused the largest debris flow yet described on Earth, which is found across the floor of the Gulf of Mexico and the Caribbean Sea. The location of the K-Pg boundary has been identified in the escarpment face by combining the new multibeam data with existing information from boreholes. The boundary is represented by an abrupt change in gradient on the escarpment face. The morphology of the escarpment combined with seismic data reveals that a significant amount of material is missing from the face, which failed catastrophically due to seismic shaking produced by the impact. The escarpment face is inferred to be an important source for the extensive debris flows triggered by the impact, whose deposits are found throughout much of the Gulf of Mexico. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: DSDP Deep Sea Drilling Project
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Bathymetry; Boreholes; Campeche Bank; Campeche Scarp; Carbonate platforms; Cenozoic; Chicxulub Crater; Continental margin; Cores; Cretaceous; DSDP Site 86; DSDP Site 94; Debris flows; Deep Sea Drilling Project; Gulf of Mexico; Impacts; K-T boundary; Leg 10; Lithostratigraphy; Lower Paleocene; Mass movements; Mesozoic; Mexico; North Atlantic; Paleocene; Paleogene; Stratigraphic boundary; Tertiary; Upper Cretaceous; Yucatan Peninsula
Coordinates: N225229 N225229 W0905745 W0905745
N234434 N234434 W0854548 W0854548
Record ID: 2015023697
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands