GEOSCAN Search Results: Fastlink


TitleYucatán karst features and the size of Chicxulub crater
AuthorConners, M; Hildebrand, A R; Pilkington, M; Ortiz-Aleman, C; Chavez, R E; Urrutia-Fucugauchi, J; Graniel-Castro, E; Camara-Zi, A; Vasquez, J; Halpenny, J F
SourceGeophysical Journal International vol. 127, 1996 p. F11-F14,
Alt SeriesGeological Survey of Canada, Contribution Series 1996197
PublisherOxford University Press (OUP)
Mediapaper; on-line; digital
File formatpdf
AreaYucatán Peninsula; Gulf of Mexico; Mexico
Lat/Long WENS -90.6667 -87.0000 21.7500 19.7500
Subjectsstructural geology; geophysics; extraterrestrial geology; karst topography; sinkholes; gravity anomalies; geophysical surveys; bouguer anomalies; topography; craters; meteorite craters; faults; faults, block; structural features; Chicxulub crater; Tertiary; Cretaceous
Illustrationssketch maps
Released2007 04 03
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 coincide with maxima in horizontal gravity gradients and a topographic depression. These observations, along with the discreteness and spacing of the features, suggest a formation mechanism involving faulting in the outer slump zone of the crater, which would thus have a diameter of approximately 180 km. An opposing view, based primarily on the interpretation of gravity data, is that (he crater is much larger than the cenote ring implies. Given the association of the known cenote ring with faults, we here examine northern Yucatan for similar rings in gravity, surface features and elevation, which we might expect to be associated with outer concentric faults in the case of a larger, possibly multiring, structure. No such outer rings have been found, although definite patterns are seen in the distribution of karst features outside the crater rim. We explain these patterns as resulting mainly from deformation related to the block fault zone that parallels tbe shelf edge of eastern Yucatan.

Date modified: