Behavior of paleointensity during the Paleogeneстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:Behavior of the intensity of geomagnetic field in the Paleogene was studied by the analysis of the sedimentary rocks of the Russian Plate. It is revealed that in the beginning of the Paleogene the variations
of little-amplitude paleointensity (about 0.5H0, where H0 is the value of modern geomagnetic field taken
as 40 lT) were alternating with bursts of large amplitude (up to 5H0). By the end of the Paleogene only
the paleointensity variations with a little amplitude were revealed.
The relation between behavior of the paleointensity and the polarity regime is analyzed. On the basis of
the behavior of the reversal frequency and asymmetry of the polarity and according to Molostovskii et al.
(2007) the Paleogene was divided into two hyperchrons. In the first hyperchron (66–40) Ma the polarity
of the geomagnetic field was predominantly reverse. In the second hyperchron (40–22) Ma the intervals
of normal and reverse polarity alternated. The bursts of the paleointensity were revealed only in the
beginning of the first hyperchron. In addition, during the first hyperchron both the average values (for
the geological age) and the amplitude of the paleointensity variations decreased; within the interval of
(40–22) Ma both the amplitude and its mean values were changing inconsiderably.