Intensity of the earth's magnetic field - Evidence for a Mesozoic dipole low

Details Intensity of the earth's magnetic field - Evidence for a Mesozoic dipole low Intensity of the earth's magnetic field - Evidence for a Mesozoic dipole low

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..97..129p&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 97, no. 1-2, Feb. 1990, p. 129-139.

Computer Science

79

Cretaceous Period, Dipole Moments, Geomagnetism, Magnetic Anomalies, Magnetic Flux, Mesozoic Era, Dynamo Theory, Earth Mantle

Scientific paper

All of the Triassic and younger paleointensity determinations made using the Thellier (1959) method have been compiled. The data set shows the occurrence of large, long-term changes of geomagnetic dipole strength with time. Although the average dipole strength has been approximately constant since the Late Cretaceous, a dipole strength only one third of the Cenozoic value prevailed during most of the Mesozoic, following a period of larger strength possibly ending during Early Jurassic times. The Mesozoic dipole low is correlated with a cessation of relative motion between the geomagnetic axis and the mantle. The results suggest that the terrestrial dynamo exhibits different long-term stable states that are probably controlled by the thermal structure in the lowermost mantle.

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