Size and structure of the Chicxulub crater revealed by horizontal gravity gradients and cenotes

  title={Size and structure of the Chicxulub crater revealed by horizontal gravity gradients and cenotes},
  author={Alan Russell Hildebrand and Mark Pilkington and Megan Elizabeth Connors and Carlos Ortiz-Alem{\'a}n and Ren{\'e} E. Ch{\'a}vez},
IT is now widely believed that a large impact occurred on the Earth at the end of the Cretaceous period, and that the buried Chicxulub structure in Yucatán, Mexico, is the resulting crater24. Knowledge of the size and internal structure of the Chicxulub crater is necessary for quantifying the effects of the impact on the Cretaceous environment. Although much information bearing on the crater's structure is available, diameter estimates range from 170 to 300 km (refs 1á¤-7), corresponding to an… 
Yucatán karst features and the size of Chicxulub crater
SUMMARY The buried Chicxulub impact structure is marked by a dramatic ring of sinkholes (called cenotes if containing water), and adjacent less prominent partial rings, which have been shown to
Mapping Chicxulub crater structure with gravity and seismic reflection data
Abstract Aside from its significance in establishing the impact-mass extinction paradigm, the Chicxulub crater will probably come to exemplify the structure of large complex craters. Much of
Geophysical data indicate that the 65.5 million years ago Chicxulub impact structure is a multi‐ring basin, with three sets of semicontinuous, arcuate ring faults and a topographic peak ring (PR).
Shallow crustal structure of Chicxulub impact crater imaged with seismic, gravity and magnetotelluric data: inferences about the central uplift
SUMMARY The structure of the onshore portion of the Chicxulub impact crater (Yucatan, Mexico) has been studied with seismic, gravity and magnetotelluric (MT) exploration methods. A dispersion
Shiva structure : a possible KT boundary impact crater on the Western Shelf of India /
Evidence is accumulating for multiple impacts across the Cretaceous-Tertiary transition, such as the Chicxulub crater in Yucatan Peninsula, Mexico, the Shiva crater offshore western India, and the
Empirical and theoretical comparisons of the Chicxulub and Sudbury impact structures
Abstract— Chicxulub and Sudbury are 2 of the largest impact structures on Earth. Research at the buried but well‐preserved Chicxulub crater in Mexico has identified 6 concentric structural rings. In
The petrology and geochemistry of the impactite sequence and selected target rocks from the Yaxcopoil-1 borehole, Chicxulub Impact Structure, Yucatan Peninsula, Mexico
Geological and geophysical investigations of the Chicxulub meteorite impact structure have been ongoing since its scientific recognition in 1991 (Hildebrand et al. 1991). The structure is of
Size and morphology of the Chicxulub impact crater
The Chicxulub impact in Mexico has been linked to the mass extinction of species at the end of the Cretaceous period. From seismic data collected across the offshore portion of the impact crater, the
Candidates for multiple impact craters?: Popigai and Chicxulub as seen by the global high resolution gravitational field model EGM2008
Abstract. In 2008 the new Earth Gravitational Model (EGM2008) was released. It contains a complete set of spherical harmonic coefficients of the Earth's gravitational potential (Stokes parameters) to


Surficial geology of the Chicxulub impact crater, Yucatan, Mexico
The Cenote Ring provides the most accurate position of the Chicxulub crater's center, and the associated faults, fractures, and stratigraphy indicate that the crater may be ∼240 km in diameter.
Chicxulub Crater: A possible Cretaceous/Tertiary boundary impact crater on the Yucatán Peninsula, Mexico
We suggest that a buried 180-km-diameter circular structure on the Yucatan Peninsula, Mexico, is an impact crater. Its size and shape are revealed by magnetic and gravity-field anomalies, as well as
Ring of Cenotes (sinkholes), northwest Yucatan, Mexico: Its hydrogeologic characteristics and possible association with the Chicxulub impact crater
A 180-km-diameter semicircular band of abundant karst sinkholes (Ring of Cenotes) in northwest Yucatan, Mexico, coincides approximately with a concentric ring of the buried Chicxulub structure, a
Mexican site for K/T impact crater?
Research throughout the Caribbean suggests that the geophysical anomalies in the Yucatan first noted by Penfield and Camargo (1981) and called the Chicxulub crater could be the site of the impact
Chicxulub Multiring Impact Basin: Size and Other Characteristics Derived from Gravity Analysis
Reprocessed gravity data over Northern Yucatan reveal three major rings and parts of a fourth ring, spaced similarly to those observed at multiring impact basins on other planets.
Horizontal gravity gradient - An aid to the definition of crustal structure in North America
A map of the magnitude of the horizontal Bouguer gravity gradient over the North American continent is used to delineate lateral discontinuities in upper crustal density and/or thickness associated
Terrace width variations in complex lunar craters
The widths of terrace structures in complex craters on the moon are compared to existing theoretical models of their origin. Terrace widths in an individual crater increase monotonically outward
Impact Cratering: A Geologic Process
The mechanisms involved in the formation of impact craters are examined theoretically, reviewing the results of recent investigations. Topics addressed include crater morphology, stress waves in