On the coherence between changes in biota and geomagnetic reversals in the Phanerozoic |
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| Authors: | D M Pechersky A A Lyubushin Z V Sharonova |
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| Institution: | 1.Institute of Physics of the Earth,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | The data on geomagnetic reversals, organic changes, and lower-mantle plume magmatism in the Phanerozoic are collected and
correlated. No direct relationship is revealed between the geomagnetic reversals, plumes, and biozones. However, the frequency
of geomagnetic reversals is found to correlate to the frequency of biozonal alterations. We relate this inconsistency to the
coupling of the two processes, which are mutually independent, with the long-term changes in the Earth’s rotation. The plumes
are formed at the core-mantle boundary and, thus, the reversals should have a different source. We hypothesize that the change
in the geomagnetic polarity is due to the nonuniform rotation of the inner core relative to the mantle in combination with
the changes in the axial tilt of the Earth’s rotation. |
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