Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p22b0405u&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P22B-0405
Other
1540 Rock And Mineral Magnetism, 5420 Impact Phenomena (Includes Cratering), 6022 Impact Phenomena, 6205 Asteroids And Meteoroids, 6215 Extraterrestrial Materials
Scientific paper
Cretaceous/Tertiary \(K/T\) boundary sections worldwide are characterized by the well-known geochemical anomaly, with high contents of iridium and other platinum group elements related to a large bolide impact. Here we show that the K/T boundary units in southern Mexico present sharp rock-magnetic anomalies. The impact site located in northwestern Yucatan peninsula has attracted attention to the crater and to K/T sections of the circum-Gulf of Mexico and the Caribbean. Results of rock-magnetic and stratigraphic studies of the Bochil and Guayal carbonate sections, located at about 540 and 600 km away from the Chicxulub crater center in southern Mexico are presented. The K/T boundary units present sharp \(10-20 cm wide\) rock-magnetic anomalies, with high values of low-field susceptibility and intensities of natural remanent \(NRM\), isothermal \(IRM\) and anhysteretic \(ARM\) magnetizations. In the Guayal section, low-field susceptibility increases an order of magnitude at the K/T boundary, with two smaller anomalies occurring above and below the boundary unit. NRM intensity increases some 6 times background with a small anomaly below the K/T unit. IRM intensity increases some 10 times background with a small anomaly above the K/T unit. The magnetic signal is associated with low-coercivity minerals, likely magnetite or iron-rich titanomagnetite with single or pseudo-single domain behavior. Magnetic minerals reflect rapid cooling of high temperature melts generated by the Chicxulub bolide impact.
Martinez-Lopez M.
Rebolledo-Vieyra Mario
Soler-Arechalde A. M.
Urrutia-Fucugauchi J. U.
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