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

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-09-04 DOI:10.1134/s1028334x2460275x

V. V. Abashev, D. V. Metelkin, A. A. Eliseev, V. A. Vernikovsky, N. E. Mikhaltsov, E. V. Vinogradov

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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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基于弗朗兹约瑟夫地群岛陷阱结果的早白垩世绝对地磁古强度

摘要从弗朗兹约瑟夫地群岛（FJL）胡克岛的玄武岩中获得了白垩纪正常超同步（C34n）开始时地磁场强度绝对值的数据。这些玄武岩被认为是高纬度北极大火成岩带的表现之一。在所研究的早白垩世玄武岩中，由于存在原生岩浆榍石的伪单域晶粒，古地磁场的记录保存完好。考虑到其他必要的证据，通过 Thellier-Coe 方法获得的古地磁强度符合公认的可靠性标准。这些信息表明，125 Ma 时，在 FJL 陷阱形成期间，地磁场强度比现在低四倍。我们的估算表明，虚拟偶极矩的平均值为 1.7 × 1022 Am2。这些结果支持了关于巴里米亚-安普顿边界古强度低的观点，并表明地磁场强度、反转频率和地幔羽流的形成之间存在相关性。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.