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Late Holocene Paleomagnetic Secular Variation in the Chukchi Sea, Arctic Ocean

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Peer-reviewed

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Article

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Abstract

jats:titleAbstract</jats:title>jats:pThe geomagnetic field behavior in polar regions remains poorly understood and documented. Although a number of Late Holocene paleomagnetic secular variation (PSV) records exist from marginal settings of the Amerasian Basin in the Arctic Ocean, their age control often relies on a handful of radiocarbon dates to constrain ages over the past 4,200 years. Here we present well‐dated Late Holocene PSV records from two sediment cores recovered from the Chukchi Sea, Arctic Ocean. The records are dated using 26 jats:sup14</jats:sup>C measurements, with local marine reservoir corrections calibrated using tephra layers from the 3.6 cal ka BP Aniakchak eruption in Northern Alaska. These jats:sup14</jats:sup>C‐based chronologies are extended into the post‐bomb era using caesium‐137 dating, and mercury isochrons. Paleomagnetic measurements and rock magnetic analyses reveal stable characteristic remanent magnetization directions, and a magnetic mineralogy dominated by low‐coercivity minerals. The PSV records conform well to global spherical harmonic field model outputs. Centennial to millennial scale directional features are synchronous between the cores and other Western Arctic records from the area. Due to the robust chronology, these new high‐resolution PSV records provide a valuable contribution to the characterization of geomagnetic field behavior in the Arctic over the past few thousand years, and can aid in developing age models for suitable sediments found in this region.</jats:p>

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Keywords

3709 Physical Geography and Environmental Geoscience, 37 Earth Sciences, 3703 Geochemistry, 3705 Geology, 3706 Geophysics, 13 Climate Action

Journal Title

Geochemistry, Geophysics, Geosystems

Conference Name

Journal ISSN

1525-2027
1525-2027

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Publisher

American Geophysical Union (AGU)
Sponsorship
Swedish Research Council (DNR‐ 2016‐05092)
Danish Council for Independent Research, Natural Sciences (DFF‐4002‐00098_FNU)