Discovery and focused study of the Chicxulub impact crater

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doi: 10.1029/2011EO250001
Author(s): Urrutia-Fucugauchi, Jaime; Camargo-Zanoguera, Antonio; Pérez-Cruz, Ligia
Author Affiliation(s): Primary:
Proyecto Universitario de Perforaciones en Océanos y Continentes, Instituto de Geofisica, Universidad Nacional Autónoma de México, Mexico City, Mexico
Other:
Petróleos Mexicanos, Mexico
Volume Title: Eos, Transactions, American Geophysical Union
Source: Eos, Transactions, American Geophysical Union, 92(25), p.209-210. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0096-3941 CODEN: EOSTAJ
Note: In English. 14 refs.; strat. col., sketch maps
Summary: Three decades ago a landmark paper by Alvarez et al. (1980) proposed that an asteroid impact 65.5 million years ago was the cause of the mass extinction of about 75% of species, including the dinosaurs, at the boundary between the Cretaceous and Paleogene periods (K-Pg), formerly known as the Cretaceous-Tertiary (K-T) boundary. Alvarez et al. used geochemical studies on carbonate sequences from Italy, Denmark, and New Zealand to study the boundary layer, which was enriched in iridium and other platinum group elements (PGEs) at concentrations well above background levels. They associated these enrichments with the collision of an asteroid that injected large amounts of pulverized debris into the atmosphere, resulting in blockage of solar radiation, global cooling, and a shutdown of photosynthesis.
Year of Publication: 2011
Research Program: ODP Ocean Drilling Program
Key Words: 23 Surficial Geology, Geomorphology; Atlantic Ocean; Bolides; Breccia; Buried features; Carbonate platforms; Cenozoic; Chicxulub Crater; Cretaceous; Drilling; Ejecta; Geophysical surveys; Gravity anomalies; Gulf of Mexico; Impact breccia; Impact craters; Impact features; Impact melts; Impactites; International Continental Scientific Drilling Program; Iridium; K-T boundary; Lower Paleocene; Magnetic anomalies; Mass extinctions; Melts; Mesozoic; Metals; Metamorphic rocks; Metamorphism; Meteors; Mexico; North Atlantic; Numerical models; Ocean Drilling Program; Paleocene; Paleogene; Platinum group; Shock metamorphism; Stratigraphic boundary; Surveys; Tertiary; Upper Cretaceous; Yucatan Peninsula
Coordinates: N180000 N230000 W0860000 W0920000
Record ID: 2012004775
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