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

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Abstract

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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About the authors

V. V. Abashev

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

Author for correspondence.
Email: abashevvv@ipgg.sbras.ru

Corresponding Member of the RAS

Russian Federation, Novosibirsk; Novosibirsk

D. V. Metelkin

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

Email: abashevvv@ipgg.sbras.ru
Russian Federation, Novosibirsk; Novosibirsk

A. 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

Russian Federation, Novosibirsk; Novosibirsk

V. A. Vernikovsky

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

Email: abashevvv@ipgg.sbras.ru
Russian Federation, Novosibirsk; Novosibirsk

N. E. Mikhaltsov

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

Email: abashevvv@ipgg.sbras.ru
Russian Federation, Novosibirsk; Novosibirsk

E. V. Vinogradov

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

Email: abashevvv@ipgg.sbras.ru
Russian Federation, Novosibirsk; Novosibirsk

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