TY - JOUR

T1 - The Early Cretaceous Absolute Geomagnetic Paleointensity Based on Results for Traps of the Franz Josef Land Archipelago

AU - Abashev, V. V.

AU - Metelkin, D. V.

AU - Eliseev, A. A.

AU - Vernikovsky, V. A.

AU - Mikhaltsov, N. E.

AU - Vinogradov, E. V.

N1 - This study was supported by the Russian Science Foundation, project 23-77-01065 (experiments on the study of paleointensity on the FJL traps and regional analysis of the obtained data) and 24-17-00057 (analysis of the geological structure and geodynamic events in the high-latitude Arctic), and the Ministry of Education and Science of Russia, FSUS-2020-0039 (analysis of the dependence of the geomagnetic field intensity and the evolution of mantle plumes). This research topic is coordinated with the basic research program RAS FWZZ-2022-0001.

PY - 2024

Y1 - 2024

N2 - 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.

AB - 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.

KW - Cretaceous superchron C34n

KW - Franz Josef Land archipelago

KW - Thellier–Coe method

KW - large igneous provinces

KW - paleointensity

KW - paleomagnetism

KW - traps

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85203169595&origin=inward&txGid=ad6d6bce421b57083d1d59055605711b

UR - https://www.mendeley.com/catalogue/17c7c9db-e4ab-3c9d-84fb-a103434db2eb/

U2 - 10.1134/S1028334X2460275X

DO - 10.1134/S1028334X2460275X

M3 - Article

JO - Doklady Earth Sciences

JF - Doklady Earth Sciences

SN - 1028-334X

ER -