Periodicity of magnetic intensities in magnetic anomaly profiles: the Cretaceous of the Central Pacific

Details Periodicity of magnetic intensities in magnetic anomaly profiles: the Cretaceous of the Central Pacific Periodicity of magnetic intensities in magnetic anomaly profiles: the Cretaceous of the Central Pacific

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.133..233i&link_type=abstract

Geophysical Journal International, Volume 133, Issue 2, pp. 233-244.

Astronomy and Astrophysics

Astronomy

2

Cretaceous, Geomagnetic Reversals, Geomagnetism, Magnetic Anomalies, Orbital Cycling

Scientific paper

Spectral analyses of long magnetic anomaly profiles of Cretaceous age in the Phoenix and Hawaiian lineations within the Pacific Basin show two to five non-harmonic wavelength peaks, with probabilities >90 per cent, within the range of several tens to hundreds of kilometres for each profile. For each profile with four peak wavelengths, their ratios correlate strongly (r > 0.98) with the ratios for the Earth's orbital eccentricity periodicities for this time, and hence the profile peaks necessarily correlate with each other. These observations suggest that the magnetic anomaly signal is influenced by the Earth's changing orbital parameters, probably through their influence on the internal geomagnetic field. This implies that assumptions usually made to convert the magnetic signal to the magnetization of the oceanic crust may be suspect. The observations, if confirmed, indicate that orbital periodicities can assist in improving the age calibration of the global polarity timescale and that the predicted orbital behaviour of the Earth is confirmed for the last 150Ma.

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