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Modelling the gravity and magnetic field anomalies of the Chicxulub craterThe approximately 180-km-diameter Chicxulub crater lies buried by approximately 1 km of sediment on the northwestern corner of the Yucatan Peninsula, Mexico. Geophysical, stratigraphic and petrologic evidence support an impact origin for the structure and biostratigraphy suggests that a K/T age is possible for the impact. The crater's location is in agreement with constraints derived from proximal K/T impact-wave and ejecta deposits and its melt-rock is similar in composition to the K/T tektites. Radiometric dating of the melt rock reveals an age identical to that of the K/T tektites. The impact which produced the Chicxulub crater probably produced the K/T extinctions and understanding the now-buried crater will provide constraints on the impact's lethal effects. The outstanding preservation of the crater, the availability of detailed gravity and magnetic data sets, and the two-component target of carbonate/evaporites overlying silicate basement allow application of geophysical modeling techniques to explore the crater under most favorable circumstances. We have found that the main features of the gravity and magnetic field anomalies may be produced by the crater lithologies.
Document ID
19940016195
Document Type
Conference Paper
Authors
Aleman, C. Ortiz (Ciudad Univ. Mexico City, Mexico)
Pilkington, M. (Geological Survey of Canada Ottawa, Ontario., Canada)
Hildebrand, A. R. (Geological Survey of Canada Ottawa, Ontario., Canada)
Roest, W. R. (Geological Survey of Canada Ottawa, Ontario., Canada)
Grieve, R. A. F. (Geological Survey of Canada Ottawa, Ontario., Canada)
Keating, P. (Geological Survey of Canada Ottawa, Ontario., Canada)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z
Subject Category
GEOPHYSICS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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