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Northeastern Greenland Paleomagnetic Records Indicate the Influence of Geomagnetic Flux Lobe Intensity on Virtual Geomagnetic Pole Migration During the Holocene
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DOI：10.1029/2025JB031768.png)
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Abstract
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Paleomagnetic and rock magnetic analyses were conducted on sediment cores from the northeastern Greenland Shelf and Young Sound along the western edge of Fram Strait. The paleomagnetic signal in all three sediment cores is characterized by a strong and stable single component magnetization carried by low coercivity ferrimagnetic single domain or vortex state grains, attesting to the quality of the recorded relative paleointensity (RPI) and paleomagnetic secular variation (PSV) signals. Comparison with other archives from the northern North Atlantic, northern Greenland, and northern Europe and with geomagnetic field model outputs indicates broad similarities between the records, particularly with Finnish, Swedish and southern Greenland records. Comparison of the new RPI records with global geomagnetic field models and cosmogenic isotope production rates highlights the global character of the geomagnetic variations from the northeastern Greenland Shelf. Virtual geomagnetic pole (VGP) paths for the last 8 kyr compared to geomagnetic field strength maps at the core-mantle boundary over the same time interval illustrate that, at times of high intensity, geomagnetic flux lobes could have an effect on VGP migration. We suggest that High Arctic PSV is most likely driven by millennial-scale hemispheric geomagnetic flux lobe geometry changes.
Keywords:
paleomagnetic secular variation
relative paleointensity
northeastern Greenland
marine sediment cores
Holocene
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