Variations of the geomagnetic field during the Cretaceousстатья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:This study provides a compilation of the paleointensity records for the Cretaceous period derived from sediments of the Russian Plate and
adjacent areas. The paleoinetensity values were calibrated using the laboratory redeposition experiments. Remarkable differences in the relative
paleointensity variations were detected at the Berriasian–Early Barremian, Late Barremian–Santonian and Early–Late Maastrichtian boundaries.
In the Berriasian–Early Barremian interval, the paleointensity varied stochastically, with the amplitude of about 1Ho and the mean value of
0.63Ho (Ho is the present-day geomagnetic field intensity assumed to be 40 µT). The records for the Barremian–Santonian give a picture of
the geomagnetic field with alternating high- and low-amplitude features. The mean paleointensities remain constantly high (being on average
0.87Ho), and intervals of low-amplitude variation alternate with the pronounced bursts (3.5Ho). The Late Maastrichtian interval is characterized
by high-amplitude paleointensity variations (4Ho) and a sharp drop towards the end of the interval. All records show remarkable similarities
near the boundaries between geological time intervals, which are an increase in the amplitude and mean values of intensity at the end of
intervals followed by a decrease towards the beginning of the subsequent interval.