ASYMMETRY IN THE REVERSAL RATE BEFORE AND AFTER THE CRETACEOUS NORMAL POLARITY SUPERCHRON
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dc.contributor.author | McFadden P.L. | |
dc.contributor.author | Merrill R.T. | |
dc.date.accessioned | 2020-12-14T10:49:47Z | |
dc.date.available | 2020-12-14T10:49:47Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=267760 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1997, , 1, 43-47 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20781 | |
dc.description.abstract | 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. | |
dc.subject | DYNAMOS | |
dc.subject | REVERSALS | |
dc.subject | CORE-MANTLE BOUNDARY | |
dc.subject | PALEOMAGNETISM | |
dc.title | ASYMMETRY IN THE REVERSAL RATE BEFORE AND AFTER THE CRETACEOUS NORMAL POLARITY SUPERCHRON | |
dc.type | Статья |
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