Evidence for an increase in cosmogenic 10Be during a geomagnetic reversal
G.M. Raisbeck; F. Yiou; D. Bourles; Dennis V. Kent
- Evidence for an increase in cosmogenic 10Be during a geomagnetic reversal
Kent, Dennis V.
- Lamont-Doherty Earth Observatory
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- Reversals in the geomagnetic field, which occur every few hundred thousand years, represent a dramatic change in the Earth's environment. Although there is no satisfactory theory for such reversals, it is generally accepted that the dipole field intensity decreases to s atmosphere during the Brunhes-Matuyama reversal 730,000 yr ago. In addition to confirming an increase in cosmogenic isotope production, the results provide information on the magnitude and duration of the geomagnetic intensity decrease during such an event, and the depth at which remanent magnetism is acquired in marine sediments.
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