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Early Cretaceous geomagnetic behaviour compared to a computer model (Articolo in rivista)
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- Early Cretaceous geomagnetic behaviour compared to a computer model (Articolo in rivista) (literal)
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- 2001-01-01T00:00:00+01:00 (literal)
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M. Iorio,, D.H. Tarling, B. D?Argenio (2001)
Early Cretaceous geomagnetic behaviour compared to a computer model
in Journal of geodynamics
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- M. Iorio,, D.H. Tarling, B. D?Argenio (literal)
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- Presentazione orale all' European Geophysical Society(EGS),24th General Assembly, Nizza, Francia, 19-23 Aprile 1999 (literal)
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- Twelve patterns of geomagnetic dipole behaviour are recorded in a 88 m bore-core penetrating some 3.2 Ma of shallow water carbonates in Southern Italy, around 127 Ma (Early Cretaceous). Each pattern sequence represents a complete reversal cycle that lasts for ca. 660 ka, formed of ca. 300 ka of predominantly normal polarity and ca. 330 ka of mainly reversed polarity, while virtual Geomagnetic Pole (VGP) excursions mostly last 525 ka. The succession of excursions within the reversed sequences, appears to occur as harmonics of about 20, 44 and 64 ka. These are comparable to the Earths orbital frequencies (precession and obliquity). We consider very significant for further investigations that geomagnetic behaviour predicted from 3-D computer simulations by Glatzmaier et al. (1999), based on the geophysical properties of the present-day core-mantle boundary, has very close similarities to that observed in the bore-core remanence and occurs on almost identical time-scales to those previously determined for the bore-core VGP and intensity. (literal)
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- IAMC-Geomare, Istituto di Ricerca CNR,Napoli, Italy
Department of Geological Sciences, University of Plymouth, PL4 8AA, UK
Dipartimento di Scienze della Terra, Univ. di Napoli, Italy
(literal)
- Titolo
- Early Cretaceous geomagnetic behaviour compared to a computer model (literal)
- Abstract
- Twelve patterns of geomagnetic dipole behaviour are recorded in a 88 m bore-core penetrating some 3.2 Ma of shallow water carbonates in Southern Italy, around 127 Ma (Early Cretaceous). Each pattern sequence represents a complete reversal cycle that lasts for ca. 660 ka, formed of ca. 300 ka of predominantly normal polarity and ca. 330 ka of mainly reversed polarity, while virtual Geomagnetic Pole (VGP) excursions mostly last 525 ka. The succession of excursions within the reversed sequences, appears to occur as harmonics of about 20, 44 and 64 ka. These are comparable to the Earths orbital frequencies (precession and obliquity). We consider very significant for further investigations that geomagnetic behaviour predicted from 3-D computer simulations by Glatzmaier et al. (1999), based on the geophysical properties of the present-day core-mantle boundary, has very close similarities to that observed in the bore-core remanence and occurs on almost identical time-scales to those previously determined for the bore-core VGP and intensity. (literal)
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