Relative paleointensity of the Earth's magnetic field from marine sedimentary records: a global perspective

Details Relative paleointensity of the Earth's magnetic field from marine sedimentary records: a global perspective Relative paleointensity of the Earth's magnetic field from marine sedimentary records: a global perspective

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...56...59t&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 56, Issue 1-2, p. 59-68.

Physics

25

Scientific paper

To assess the potential of marine sediments as a source of relative paleointensity information, we have undertaken an investigation of selected box cores stored in the Scripps core repository. We present here new results from two North Atlantic box cores. Magnetic remanence in the sediments is carried by magnetite and is univectorial during alternating field and thermal demagnetization. The median destructive field is 25-30 mT. Normalization by anhysteretic remanent magnetization yields relative paleointensity data that are highly concordant within and between cores. Age control provided by oxygen isotope data from both cores allows comparison of these relative paleointensity data with contemporaneous archeomagnetic data from Czechoslavakia. Both data sets indicate a peak in paleofield intensity at around 8-10 ka. This peak is less prominent in box core data from the western Pacific and global averages of archeomagnetic and lava flow data. However, the peak is evident in data estimating changes in production of radiocarbon, which is controlled in part by changes in the dipole moment of the geomagnetic field. The excellent agreement between production variations predicted by the changes in dipole moment and those observed suggests that long-term variations in atmospheric radiocarbon are dominated by geomagnetic field variations.

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