Physics
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012geoji.189..383k&link_type=abstract
Geophysical Journal International, Volume 189, Issue 1, pp. 383-390.
Physics
Palaeointensity, Palaeomagnetic Secular Variation, Impact Phenomena
Scientific paper
We carried out palaeointensity experiments on 45 samples collected throughout the ca. 15 Ma Ries crater (Germany) to test whether meteorite impacts can influence the geodynamo. A Thellier-Thellier procedure with alteration, tail and additivity checks yields a weighted average palaeointensity of 19.1 ± 1.1 μT from 15 samples that pass stringent data selection criteria. The corresponding virtual dipole moment of 3.2 ± 0.2 × 1022 Am2 is relatively low, but indistinguishable from the global palaeointensity database between 20 and 10 Ma. Our results suggest that either the energy released during the Ries meteorite impact event was too low to affect the geodynamo, the Ries impact lithologies cooled too fast to record any effect, or the time averaged by the impact lithologies was long enough to record secular variation, but that the geodynamo was remarkably stable over that time.
Gilder Stuart A.
Koch Stephan A.
Pohl J. J.
Trepmann Claudia
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