Geomagnetic reversal spurts and episodes of extraterrestrial catastrophism

Details Geomagnetic reversal spurts and episodes of extraterrestrial catastrophism Geomagnetic reversal spurts and episodes of extraterrestrial catastrophism

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..148p&link_type=abstract

Nature (ISSN 0028-0836), vol. 320, March 13, 1986, p. 148-150.

Mathematics

Logic

21

Catastrophe Theory, Geomagnetism, Impact Melts, Magnetic Field Inversions, Tektites, Geological Surveys, Hypervelocity Impact

Scientific paper

The temporal relation between geomagnetic reversals and those catastrophic episodes which occurred during periods of frequent reversals is examined, based on the hypothesis that the geomagnetic field should be most susceptible to catastrophism during its relatively unstable periods of frequent reversals. Spurts in the frequency of geomagnetic reversals are found at approximately 30-Myr intervals, correlated with catastrophic episodes. These spurts can be seen as the geomagnetic signatures of terrestrial catastrophism, and they are tentatively ascribed here to enhanced core turbulence during episodes of bombardment. The absence of reversal spurts during long intervals of fixed polarity is attributed to the failure during these intervals of the geomagnetic dynamo's bistable oscillations.

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