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TitleSize and structure of the Chicxulub crater revealed by horizontal gravity gradients and cenotes
AuthorHildebrand, A R; Pilkington, M; Connors, M; Ortiz-Aleman, C; Chavez, R E
SourceNature vol. 376, no. 6539, 1995 p. 415-417,
Alt SeriesGeological Survey of Canada, Contribution Series 66994
PublisherSpringer Nature
Mediapaper; on-line; digital
File formatpdf
AreaYucatán Peninsula; Mexico
Lat/Long WENS -90.2500 -89.2500 21.5000 20.5000
Subjectsgeophysics; extraterrestrial geology; meteorite craters; sinkholes; gravity anomalies; bouguer anomalies; groundwater flow; Cretaceous; Tertiary
Illustrationscross-sections; sketch maps
Released1995 08 03
AbstractIT 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 order of magnitude variation in impact energy. Here we show the diameter of the crater to be ~ 180 km by examining the horizontal gradient of the Bouguer gravity anomaly over the structure. This size is confirmed by the distribution of karst features in the Yucatan region (mainly water-filled sinkholes, known as cenotes). The coincidence of cenotes and peripheral gravity-gradient maxima suggests that cenote formation is closely related to the presence of slump faults near the crater rim.

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