Antarctic ice core 10Be records reveal geomagnetic dipole intensity variations from 170 to 270 ka BP
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Summary
This study presents high-resolution 10Be concentration and flux records from the Talos Dome ice core in East Antarctica, covering 170 to 270 ka BP. The research identifies three distinct geomagnetic events: the Iceland Basin Excursion (IBE) showing a clear 10Be peak flux 1.59-2.08 times above background with asymmetric structure, the Pringle Falls Excursion (PFE), and the Mamaku Excursion (ME). The study also identifies 40 short-term 10Be concentration minima linked to post-depositional effects. Comparisons with Dome Fuji ice core and oceanic authigenic 10Be/9Be records show strong agreement, supporting the use of 10Be for synchronizing ice and marine archives and reconstructing past geomagnetic dipole moment variations.
Key quotes
· 4 pulledThe dipole collapse linked to the Iceland Basin Excursion (IBE) is clearly recorded as a 10Be peak flux 1.59 to 2.08 times above background between (192.0±1.4) ka BP and (185.6±1.4) ka BP.
A clear asymmetric structure is observed, with a rapid decline of the geomagnetic dipole, followed by a three-step recovery.
Comparison with Dome Fuji ice core and oceanic authigenic 10Be/9Be records reveals strong agreement in the timing and structure of the dipole moment collapses linked with these excursions.
These results further support the use of 10Be for synchronizing ice and marine archives as well as to reconstruct past geomagnetic dipole moment variations and refining age models over the Pleistocene.
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