Paleomagnetic tomography of the core-mantle boundary

Details Paleomagnetic tomography of the core-mantle boundary Paleomagnetic tomography of the core-mantle boundary

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pepi...64...87m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 64, Issue 1, p. 87-101.

Physics

17

Scientific paper

Analysis of updated global paleomagnetic data indicates that over the last 5 million years the normal and reverse polarity states are discernibly different. This difference, which can be characterized by a higher ratio of the axial quadrupole to dipole field for the reverse polarity relative to the normal polarity, is attributed to lateral variations in temperature or composition at or near the core-mantle boundary. Although several mechanisms are considered, thermal electric effects associated with core-mantle topography and/or with chemical variations in D'', the seismic layer (approximately 150 km thick) at the base of the mantle, are judged to be the most likely sources of the observed polarity asymmetry. This asymmetry should not necessarily be expected to give rise to systematic trends in polarity transitions.

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