Mathematics – Logic
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9913147p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. E6, p. 13147-13162
Mathematics
Logic
57
Gravity Anomalies, Magnetic Anomalies, Meteorite Craters, Mexico, Structural Properties (Geology), Three Dimensional Models, Crustal Fractures, Geological Surveys, Magnetic Fields, Mathematical Models, Potential Fields, Seismology
Scientific paper
The Chicxulub crater is an approximately 180-km-diameter peak-ring crater based on drill hole logs and samples, potential fields, seismic reflection profiles, and surface fracture patterns. A structural cross section produced based on these constraints has the features expected for a large complex impact crater. The Bouguer-gravity anomaly consists of a broad approximately 90-km radius, approximately-30-mGal low with a central approximately 20-km radius, approximately 20-mGal high and two less than 5-mGal concentric lows at approximately 35- and approximately 60-km radius. The gravity anomaly is disrupted by large-scale basement anomalies and possibly by large-scale slumping and backwash erosion effects. The magnetic field anomaly over the crater consists of three zones, an outer zone from approximately 45- to approximately 90-km radius of low-amplitude, short-wavelength anomalies with an irregular perimeter, a middle zone from approximately 20- to approximately 45-km radius of high-amplitude, short-wavelength anomalies slightly elongated NNW-SSE, and an inner approximately 20-km-radius single large-amplitude anomaly. Magnetic field modeling indicates that the melt pool averages approximately 90 km in diameter and the melt volume in the crater is estimated at approximately 20,000 cu km. The melt pool size constrains the collapsed transient cavity diameter to approxiamtely 90 km. Gravity and magnetic field modeling indicate that the structural uplift is irregular in shape but approximately 40 km in diameter and underlies or protrudes into the melt pool. The preliminary structural cross section indicates that the inferred peak-ring is decoupled from the structural uplift. The geometry and Bouguer gravity signature of the crate indicate that no significant uplift of the Moho or relaxation of the crater has occurred.
Hildebrand Alan Russell
Ortiz-Aleman Carlos
Pilkington Mark
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