Intermittent non-axial dipolar-field dominance of twin Laschamp excursions
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Published:2022-04-04
Issue:1
Volume:3
Page:
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ISSN:2662-4435
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Container-title:Communications Earth & Environment
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language:en
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Short-container-title:Commun Earth Environ
Author:
Hyodo MasayukiORCID, Nakagawa TakeshiORCID, Matsushita Hayato, Kitaba Ikuko, Yamada KeitaroORCID, Tanabe Shota, Bradák BalázsORCID, Miki Masako, McLean Danielle, Staff Richard A.ORCID, Smith Victoria C.ORCID, Albert Paul G., Bronk Ramsey ChristopherORCID, Yamasaki Akiteru, Kitagawa Junko, Schlolaut Gordon, Gotanda Katsuya, Tsumura Kosuke, Inagawa Kaito, Kumazawa Koyo, Abe Haruka, Sugo Saki, Takahashi Koki, Kitamura Atsumi,
Abstract
AbstractGeomagnetic excursions represent the dynamic nature of the geodynamo. Accumulated palaeomagnetic records indicate that such excursions are dominated by dipolar-fields, but exhibit different structures. Here we report a palaeomagnetic record from the varved sediments of Lake Suigetsu, central Japan, which reveals fine structures in the Laschamp Excursion and a new post-Laschamp excursion that coincides with the Δ14C maxima. The record’s high-resolution chronology provides IntCal20 mid-ages and varve-counted durations. Both excursions comprise multiple subcentennial directional-swings. Simulations of filtering effects on sediment-magnetisations demonstrate that this high-resolution record replicates most of the features in existing, lower-resolution Laschamp excursion records, including the apparent clockwise open-loop of the virtual geomagnetic pole pass. The virtual geomagnetic poles during the ‘swing’ phases make four clusters centred in hemispherically-symmetric regions, three of which encompass the virtual geomagnetic poles associated with the Laschamp Excursion recorded in lavas at various locations. The stationary dipolar-field sources under each cluster should have intermittently dominated one after another during the excursions.
Funder
MEXT | Japan Society for the Promotion of Science
Publisher
Springer Science and Business Media LLC
Subject
General Earth and Planetary Sciences,General Environmental Science
Reference63 articles.
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