Geomagnetic reversals in the paleozoic: A transitional field,polarity bias,and mantle convection |
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| Authors: | A N Khramov |
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| Institution: | (1) All-Russia Petroleum Research Exploration Institute (ARPREI), Liteinyi pr. 39, St. Petersburg, 191104, Russia |
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| Abstract: | The paper analyzes previously published results of studies of detailed records of geomagnetic reversals in sedimentary and volcanic sequences of the Paleozoic in the Siberian and Eastern European platforms. It is shown that the processes of geomagnetic reversals, both in the Early Paleozoic and at the end of this era, are well described by a model in which the transitional field is controlled by an equatorial dipole. During a reversal, this dipole maintained a magnetic field at the Earth’s surface whose intensity amounted to about 20% of the intensity before and after the reversal. The equatorial dipole existed before and during the reversal and was responsible for the deviation from antipodality of paleomagnetic poles of adjacent polarity chrons (the so-called reversal bias). The position of the equatorial dipole axis during the Paleozoic correlates with the supposed geometry of convective motions in the mantle at that time. |
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