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Verifying the mesozoic dipole low hypothesis by the Siberian trap data

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Abstract

A complex study is carried out for the collection of trap rocks sampled from two sequences in the geographically distant regions of the Siberian trap province: the Ergalakh section (Norilsk region) and Tyvankitskii and Delkanskii formations (Maymecha-Kotuy region). The magnetic and thermomagnetic properties are studied, petrographic and microscopic investigations are carried out, the paleointensities are determined, and the domain structure of ferromagnetics is assessed using the Day diagram and the thermomagnetic criterion. It is shown that small single-domain and/or pseudo-single-domain grains are the carriers of remanent magnetization. The absolute paleointensities H anc are determined by the Thellier-Coe method with test heating of the samples to lower temperatures (check-point procedure). The paleointensity estimates that meet the modern reliability criteria are obtained in more than 130 samples. The mean H anc values in the lava flows from the Ergalakh section and the TyvankittskiiFormation, as well as in samples from the Delkanskii Formation, vary within 2.1–24.6 mkT, which is considerably lower than the present magnetic field at the sampling site (∼ 50 mkT). The corresponding mean VDM values in these sites vary within (0.54–3.2) × 1022 Am2 (with a dispersion of ∼0.9 × 1022 Am2), which is far lower than the mean VDM value (∼8 × 1022 Am2) in the Late Cenozoic. The agreement of low H anc and VDM determined in the Ergalakh section, Tyvankitskii, and Delkanskii formations with the previous similar data on the traps (Solodovnikov, 1994; Heunemann et al., 2004; Shcherbakova et al., 2005; 2013) supports the Mesozoic Dipole Low (MDL) hypothesis. In the Ergalakh section, low and extremely low H anc (11.2 and 2.7 mkT) are determined in two pulses (five flows) of the Ivakinskii Formation, which precedes the geomagnetic reversal. This probably indicates that these flows recorded a sharp decrease in H anc prior to the geomagnetic reversal (or at its beginning), which occurred at the earliest stage of the Norilsk tuff-lava sequence formation. The abnormal values of paleodirections and paleointensities in the group of the flows of the Tyvankitskii Formation suggest that they could have been formed during the anomalous nonstationary state of the geomagnetic field such as the excursion.

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Authors and Affiliations

  1. Borok Geophysical Observatory, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Borok, 152742, Russia

    V. V. Shcherbakova, G. V. Zhidkov & V. P. Shcherbakov

  2. Schmidt Institute of Physics of the Earth, ul. Bol’shaya Gruzinskaya 10, Moscow, 123995, Russia

    A. V. Latyshev

  3. Faculty of Geology, Moscow State University, Moscow, 119991, Russia

    A. V. Latyshev & A. M. Fetisova

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  1. V. V. Shcherbakova
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  2. G. V. Zhidkov
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  3. V. P. Shcherbakov
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  4. A. V. Latyshev
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  5. A. M. Fetisova
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Correspondence to V. V. Shcherbakova.

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Original Russian Text © V.V. Shcherbakova, G.V. Zhidkov, V.P. Shcherbakov, A.V. Latyshev, A.M. Fetisova, 2015, published in Fizika Zemli, 2015, No. 3, pp. 47–67.

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Shcherbakova, V.V., Zhidkov, G.V., Shcherbakov, V.P. et al. Verifying the mesozoic dipole low hypothesis by the Siberian trap data. Izv., Phys. Solid Earth 51, 362–382 (2015). https://doi.org/10.1134/S1069351315030155

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