The early cretaceous absolute geomagnetic paleointensity based on results for traps of the franz josef land archipelago

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Data on the absolute value of the geomagnetic field intensity at the beginning of the Cretaceous Normal Superchron (C34n) was obtained from basalts of Hooker Island of the Franz Josef Land archipelago (FJL). These basalts are considered as one of the manifestations of the High Arctic Large Igneous Province. The record of the ancient geomagnetic field in the studied Early Cretaceous basalts was preserved well due to the presence of pseudo-single domain grains of primary magmatic titanomagnetite. The paleointensity, obtained by the Thellier–Coe method, satisfies the generally accepted reliability criteria, taking into consideration other necessary evidence. This information indicates that 125 Ma, during the formation of the FJL traps, the intensity of the geomagnetic field was four times lower than today. Our estimates show that the mean value of the virtual dipole moment was 1.7 × 10²² Am². These results support the views about the low paleointensity at the Barremian–Aptian boundary and indicate a correlation between the intensity of the geomagnetic field, the frequency of reversals, and the formation of mantle plumes.

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作者简介

V. Abashev

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Science; Novosibirsk State University

编辑信件的主要联系方式.
Email: abashevvv@ipgg.sbras.ru

Corresponding Member of the RAS

俄罗斯联邦, Novosibirsk; Novosibirsk

D. Metelkin

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Science; Novosibirsk State University

Email: abashevvv@ipgg.sbras.ru
俄罗斯联邦, Novosibirsk; Novosibirsk

A. Eliseev

Novosibirsk State University; Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Science, Novosibirsk

Email: abashevvv@ipgg.sbras.ru

Academician of the RAS

俄罗斯联邦, Novosibirsk; Novosibirsk

V. Vernikovsky

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Science; Novosibirsk State University

Email: abashevvv@ipgg.sbras.ru
俄罗斯联邦, Novosibirsk; Novosibirsk

N. Mikhaltsov

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Science; Novosibirsk State University

Email: abashevvv@ipgg.sbras.ru
俄罗斯联邦, Novosibirsk; Novosibirsk

E. Vinogradov

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Science; Novosibirsk State University

Email: abashevvv@ipgg.sbras.ru
俄罗斯联邦, Novosibirsk; Novosibirsk

参考

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2. Fig. 1. Geological structure of the northern part of Hooker Island, Tikhaya Bay area. a – diagram of the location of the Franz Josef Land archipelago; b – diagram of the geological structure of Hooker Island: 1 – Early Cretaceous basalts and dolerites, undifferentiated; 2 – stock of the Rubini Rock; 3 – paleomagnetic sampling points; c – general view of the Tikhaya Bay cliff indicating the location of outcrop ١1z01, 02; c – photo of the section at Cape Albert Markam indicating the location of outcrop ١١z18, 19; d – photo of the section at Cape Medvezhiy indicating the location of outcrop 11z22.

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3. Fig. 2. Typical graphs based on the results of paleomagnetic experiments for the Early Cretaceous basalts of FJL, from left to right: orthogonal Zijderveld diagram (in sample coordinates) based on the results of stepwise thermal demagnetization; Arai–Nagata diagrams based on the assessment of paleointensity Вanc by the Thellier–Coe method (filled and empty dots are experimental values ​​that were and were not included in the approximation interval, the red straight line is the trend line, triangles are check-points); thermomagnetic curves NRM, TRM and TRM* and a graph of the dependence of NRM and TRM for assessing paleointensity В*anc by the Wilson–Burakov method.

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4. Fig. 3. Comparison of the obtained VDM values ​​(red circles) (see Table 1) with the available definitions (white circles) for the period of 80–200 million years according to [5]. At the bottom is the geomagnetic polarity time scale according to [13], black color corresponds to intervals of direct, white – reverse, gray – mixed (frequent inversions out of scale) polarity. The red dotted line shows the modern VDM value, the blue vertical stripes highlight the intervals of ultra-low VDM values.

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