Estimating the Variations in Paleointensity from the Siberian
Traps of MaymechaKotui and Norilsk Regions

V. V. Scherbakova^a, G. V. Zhidkov^a, A. V. Latyshev^b, and V. P. Scherbakov^a

^aBorok Geophysical Observatory of the Institute of Physics of the Earth, Russian Academy of Sciences,
Borok, Nekouz region, Yaroslavl oblast, Russia

e-mail: valia@borok.yar.ru

^b Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, ul. B. Gruzinskaya 10, Moscow, 123995 Russia

e-mail: anton.latyshev@gmail.com

Received July 16, 2012; in final form, December 12, 2012

Abstract—The results of determining the paleointensity of the Siberian traps sampled from the Kotui
sequence, Truba ravine, Onkuchak Suite, and dated to Permian–Triassic are presented. Most of the H_anc values
for separate lava flows are significantly lower than the values of the present geomagnetic field at the observation
point (approximately 50 T). This is consistent with the known conclusion that the intensity of the geomagnetic
field at the Permian–Triassic boundary was lower by a factor of two to three lower than its present value. We
carried out the comparative analysis of the behavior of H_an and VDM for two trap sequences (Kotui (the
Onkuchak Suite) and Norilsk) from the standpoint of the eruptive pulse hypothesis. In both sections, the aver-
age VDM values and their dispersion are similar. For comparison, similar analysis of the VDM behavior is con-
ducted for the Brunhes epoch and Miocene in the interval of 5–10 Ma. It is hypothesized that during the three
considered periods, namely, the eruption of the Siberian traps, in the Brunhes epoch, and in Miocene (in the
interval of 5–10 Ma), the time behavior of the geomagnetic field was close to a stationary stochastic process.

DOI: 10.1134/S1069351313030142

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