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Geomagnetic Dipole Strength During the Cretaceous Normal Superchron Recorded by Baked Sediments From Hainan (SE Asia)статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 15 октября 2025 г.
- Авторы: Chi Yuchen, Lhuillier Florian, Meng Jun, Zhang Chunyang, Shcherbakov Valeriy P.
- Журнал: Geophysical Research Letters
- Том: 52
- Номер: 17
- Год издания: 2025
- Издательство: American Geophysical Union
- Местоположение издательства: United States
- Номер статьи: e2025GL116894
- DOI: 10.1029/2025gl116894
- Аннотация: The Cretaceous Normal Superchron constitutes an enigmatic ∼37-Myr interval of stable polarity in the history of the Earth's magnetic field. The strength of the geomagnetic dipole moment during this interval is controversial, with absolute paleointensity determinations on crystallized volcanic rocks, volcanic glasses, and silicate crystals yielding statistically different averages. In this study, we present the first paleointensities in the mid of the superchron conducted on baked sediments from Hainan (SE Asia). This hitherto underexploited material, akin to baked clays used in archeomagnetism, produces unambiguous linear Arai-Nagata diagrams over 60%–90% of the fraction of natural remanent magnetization. Using strict selection criteria, we show that baked sediments, volcanic glasses, and silicate crystals are consistent with a dipole moment ∼40% higher than the present-day value. Relying on 22 independent determinations only, this combined data set leaves open the question of the dependency between geomagnetic dipole strength and reversal frequency.
- Добавил в систему: Афиногенова Наталья Александровна