Other
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1455u&link_type=abstract
In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1455-1456 (SEE N94-20636 05-91
Other
Geomagnetism, Impact Melts, Mineralogy, Polarity, Remanence, Rocks, Shock Heating, Breccia, Core Sampling, Cretaceous-Tertiary Boundary, Iridium, Paleomagnetism
Scientific paper
Further paleomagnetic data for core samples of melt rock recovered in the Petroleos Mexicanos (PEMEX) exploratory wells within the Chicxulub structure, northern Yucatan peninsula, Mexico are reported. A previous report by Sharpton showed that the rocks studied contain high iridium levels and shocked breccia clasts, and an Ar-40/Ar-39 age of 65.2 plus or minus 0.4 Ma. The geomagnetic polarity determined for two samples is reverse (R) and was correlated with chron 29R that includes the K/T boundary. Our present analysis is based on two samples from each of three clasts of the melt rock from PEMEX well Y6-N17 (1295 to 1299 m b.s.l.). This study concentrates on the vectorial nature and stability of the remanence (NRM), the magnetic mineralogy and remanence carriers (i.e., the reliability and origin of the record), and on the implications (correlation with expected paleolatitude and polarity). The relative orientation of the drill core samples with respect to the horizontal is known. Samples were stable under alternating field (AF) and thermal treatments, and after removal of a small component they exhibited single-vectorial behavior. The characteristic remanence inclinations show small dispersion and a mean value (-43 deg) in close agreement with the expected inclination and paleolatitude (derived from the North American apparent polar wander path). Isothermal remenence (IRM) acquisition experiments, Lowrie-Fuller tests, coercivity and unblocking temperature spectra of NRM and saturation IRM, susceptibility and Q-coefficient analyses, and the single-component nature indicate a dominant mineralogy of iron-rich titanomagnetites with single or pseduo-single domain states. The stable characteristic magnetization may be interpreted as a result of shock heating of the rock at the time of formation of the inpact structure and its polarity, age, and paleolatitude are consistent with a time about the K/T boundary.
Marin Luis E.
Quezada Juan Manuel
Sharpton Virgil L.
Urrutia-Fucugauchi Jaime
No associations
LandOfFree
Reverse polarity magnetized melt rocks from the Chicxulub impact structure, Yucatan Peninsula, Mexico does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Reverse polarity magnetized melt rocks from the Chicxulub impact structure, Yucatan Peninsula, Mexico, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reverse polarity magnetized melt rocks from the Chicxulub impact structure, Yucatan Peninsula, Mexico will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1450893