1. Introduction

[2]  Revealing of the periodicity in the dynamics of the geomagnetic field intensity makes it possible to compare it with geodynamical processes. Such comparison is an important element in studying mechanisms governing the evolution of our planet. According to recent estimates, in the Quaternary the intensity of some geotectonic processes and paleointensity have similar by duration recurrence changes. For example, according to Kozhemyaka [2001] and Chernyshev et al. [2002] the volcanogenic activity in Quaternary was not permanent but was manifested in the form of bursts with duration usually not exceeding 100 millennia. Guyodo and Valet [1999] and Petrova et al. [2002] (curves Sint 800, Vadm 21) showed that the duration of the cycles of paleointensity variation also was from a few tens to a few hundreds millennia. Apparently, the dynamics of these events is determined by a series of common causes: processes within the Earth and cosmogenic factors. The results of Herrero-Bervera and Valet [2002] indicated a close periodicity of the volcano activity and paleointensity dynamics. It follows from their paper that in the current magnetopolar epoch most part of the Hawaii volcano lava flows has been formed at relatively high values of the geomagnetic field intensity. According to Herrero-Bervera and Valet [2002] the averaging of the results of paleointensity determination from volcanogenesis provides an overestimated evaluation of its mean value as compared to the paleointensity value derived from sediments. Therefore a complete picture of the paleointensity behavior cannot be obtained without attracting data obtained from sediment rocks.

[3]  At the same time, permanent data on the dynamics of the magnetic field intensity obtained from sediments are few. The behavior of the paleointensity is studied in detail only during the recent 4 Myr [Valet and Meynadier, 1993]. They determined the behavior of the paleointensity during three recent magnetopolar intervals. It follows from their results that the geomagnetic field intensity is varying cyclically. However, the paleointensity behavior is strongly complicated by frequent events of changes of its polarity, so it seems impossible to reveal a periodicity exceeding 100-200 millennia at this time interval.

[4]  The paleointensity of some fragments of the Cretaceous period obtained from marine sediments of the Russian platform was determined in a series of our publications [Guzhikov et al., 2002; Kurazhkovskii et al., 2002, 2003]. A compilation of these results into a joint picture would make it possible to obtain at least relatively complete representation of the dynamics of the magnetic field intensity in Barremian-Cenomanian (a time interval 20-30 Myr long) and to find new features in its behavior.

[5]  This paper is dedicated to a compilation of fragmentary information on the paleointensity of the Cretaceous period (Barremian-Cenomanian), to searches for the recurrence in its dynamics, and to an attempt to compare it with geotectonic processes.