Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.139..131g&link_type=abstract
Geophysical Journal International, Volume 139, Issue 1, pp. 131-151.
Astronomy and Astrophysics
Astronomy
4
Crust, Free Core Nutation, Geomagnetic Reversals, Resonances
Scientific paper
We suggest that some major geological events observed during the history of the Earth such as the worldwide continental-crust-forming episodes could result from very large oscillations of the fluid core induced by the luni-solar tidal forces. As a consequence of the secular deceleration of the time-dependent axial rotation of the Earth, the rotational free core nutation of the fluid core and some solar tidal waves were in resonance around 3.0 Gyr, 1.8 Gyr and 300 Myr ago. The associated viscomagnetic frictional power may be converted into heat and may, on the one hand, create instability of the D'' thermal layer, leading to the generation of a deep mantle plume, and, on the other hand, increase the temperature at the top and bottom of the fluid core, perturbing the core dynamo processes.
Greff-Lefftz Marianne
Legros Hilaire
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