Estimate of the length of day and geodynamical parameters near to the time of Earth formation

Details Estimate of the length of day and geodynamical parameters near to the time of Earth formation Estimate of the length of day and geodynamical parameters near to the time of Earth formation

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....1054v&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #1054

Physics

Scientific paper

The history of the length of day (LOD) is of central interest for understanding of the origin and evolution of the Earth. It was discovered by us that the despinning rate was on the average five times smaller during the Proterozoic than during the Phanerozoic (Journal of Geodynamics, 34 (2002), 667-685). The extrapolation of the despinning data deduced from fossils and tidal deposits allows us to conclude, that the LOD was 4.5 Ga BP between 17.5 and 19.5 hours. Similar values can be obtained from the study of the tidal characteristic time. With the use of LOD 4.5 Ga BP the geometrical flattening and the Earth-Moon distance can be estimated together with the loss of the rotational energy during the lifetime of our planet.

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