Paleomagnetic excursion recorded in latest Pleistocene deep-sea sediments,Gulf of Mexico |
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| Authors: | HC Clark JP Kennett |
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| Institution: | Department of Geology, Rice University, Houston, Texas, USA;Graduate School of Oceanography, University of Rhode Island, Kingston, Rhode Island, USA |
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| Abstract: | Paleomagnetic and/or micropaleontological studies have been carried out on approximately 28 sedimentary cores of latest Pleistocene age from the Gulf of Mexico. Sedimentation rates range from 9 cm to 20 cm/1000 yr. A distinct excursion in the earth's magnetic field occurs in the upper parts of 8 of 15 cores for which paleomagnetic studies were conducted and is independently correlated with planktonic foraminiferal zones. An inclination change to zero or negative inclination is often associated with a declination change. The age of the excursion was determined by extrapolation of sedimentation rates from the Z-Y paleontological boundary which is dated at 11,000 B.P. The magnetic excursion occurred between 12,500 and 17,000 yr ago within the upper part of zone Y. This falls within the age range of the Laschamp Event as originally defined. |
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