Periodicity of magnetic intensities in magnetic anomaly profiles: the Cenozoic of the South Atlantic |
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| Authors: | B D'Argenio M Iorio D H Tarling |
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| Institution: | Geomare sud, Research Institute, C.N.R., Via Vespucci 10, Napoli, Italy;Department of Geological Sciences, University of Plymouth PL4 8AA, UK;Dip. Scienze della Terra, University of Napoli, Largo San Marcellino 10, Napoli, Italy |
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| Abstract: | Spectral analyses of several published magnetic anomaly profiles from Candé & Kent (1992a) were undertaken prior to analysing, in the same way, raw magnetic anomaly data from similar parts of the South Atlantic. It was found that similar and distinct medium and short wavelengths were present in both the published and raw data. When these are converted into the time domain using the average rate of spreading for each profile, these periodicities appear similar, possibly identical, to those expected from the long-term eccentricity orbital parameters (Fischer, DeBoer & Premoli Silva 1990). While such correlations are not necessarily causative, they suggest that magnetohydro-dynamical processes near the core-mantle boundary may be affected by gravitational changes due to planetary orbital perturbations. |
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| Keywords: | Key words: Cenozoic geomagnetic reversals geomagnetism magnetic anomalies magnetostratigraphy |
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