Physics
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997e%26psl.149...43m&link_type=abstract
Earth and Planetary Science Letters, Volume 149, Issue 1, p. 43-47.
Physics
12
Scientific paper
The geomagnetic reversal chronology shows a decreasing reversal rate, λ, from about 160 Ma to about 118 Ma, a cessation in the reversal process (the Cretaceous Normal Polarity Superchron) until about 83 Ma, and then an increasing λ until recent times. Visually, the rate of decrease in λ leading into the superchron appears larger than the rate of increase in λ following the superchron. Statistical tests developed here confirm the visual perception of an asymmetry in the rate of change in λ. This asymmetry could be caused by a relatively rapid breakdown of D″, with thermal energy being advected away followed by a slower thickening of the layer through thermal conduction. However, in the absence of good thermal models as to how different core-mantle boundary conditions affect the geodynamo there are probably many apparently viable speculations as to the origin of the observed rate asymmetry.
McFadden Paul L.
Merrill Ronald T.
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