Transitional field behaviour from Southern Hemisphere lavas Evidence for two-stage reversals of the geodynamo

Details Transitional field behaviour from Southern Hemisphere lavas Evidence for two-stage reversals of the geodynamo Transitional field behaviour from Southern Hemisphere lavas Evidence for two-stage reversals of the geodynamo

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..228h&link_type=abstract

Nature (ISSN 0028-0836), vol. 320, March 20, 1986, p. 228-232. Research supported by the U.S.-Australia Cooperative Science Prog

Computer Science

37

Dynamo Theory, Geomagnetism, Lava, Magnetic Field Inversions, Paleomagnetism, Australia, Magnetic Field Configurations, Northern Hemisphere, Southern Hemisphere, Volcanoes

Scientific paper

Palaeomagnetic records from Australasian basalts provide a rare view of transitional field behavior, as seen from mid-southern latitudes. These data suggest that a geomagnetic reversal is accomplished in two steps, separated by an interval of relative dynamo quiescence. A potentially long-lived field configuration, developed early, is observed to be the 'stepping stone' from which both successful and unsuccessful reversal attempts are made. Several aborted attempts involving the same intermediate field geometry may precede an actual polarity transition.

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