A refined age calibrated paleosecular variation and relative paleointensity stack for the NW Barents Sea: Implication for geomagnetic field behavior during the Holocene

Reconstruction of Paleomagnetic Secular Variation (PSV) of the geomagnetic field is fundamental both to assess geodynamo models and to obtain age constraints for rocks, sediments and archaeological material. We present refined age-calibrated Holocene PSV and relative paleointensity (RPI) stack curve...

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Bibliographic Details
Published in:Quaternary Science Reviews
Main Authors: Caricchi, Chiara, Sagnotti, Leonardo, Campuzano, Saioa Arquero, Lucchi, Renata Giulia, Macrì, Patrizia, Rebesco, Michele, Camerlenghi, Angelo
Other Authors: Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia, Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Trieste, Italia
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2020
Subjects:
Paleomagnetism
Geomagnetic paleosecular variation
Relative paleointensity
Marine sediment cores
Arctic region
Barents Sea
Holocene
Solid Earth
Arctic
Online Access:http://hdl.handle.net/2122/13610
https://doi.org/10.1016/j.quascirev.2019.106133
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Summary:Reconstruction of Paleomagnetic Secular Variation (PSV) of the geomagnetic field is fundamental both to assess geodynamo models and to obtain age constraints for rocks, sediments and archaeological material. We present refined age-calibrated Holocene PSV and relative paleointensity (RPI) stack curves derived from Arctic marine sediments (Northwestern Barents Sea). The Holocene sections of four sedimentary cores were correlated on the basis of paleomagnetic trends and age models, and stacked. The resultant composite PSV and RPI Holocene records (NBS stack) and the reconstructed Holocene Virtual Geomag- netic Pole (VGP) path were evaluated in comparison with the most recent paleomagnetic stack curves and geomagnetic field models. The data indicate that during the Holocene time, the VGPs moved within the superficial projection of the inner core tangent cylinder, with the exception of short time intervals around 5600 and 3200 cal yr BP when VGPs extended to lower latitudes. These deviations might reflect regional geomagnetic features, such as persistent geomagnetic flux lobes at core-mantle boundary. Our data confirm that the large VGP shift observed around 5600 cal yr BP is the result of an increased radial magnetic field at the core-mantle boundary over North America, whilst the VGP shift around 3200 cal yr BP represents a major swing to middle latitudes toward the Middle East and might be associated to a regional high paleointensity peak, known as Levantine Iron Age Anomaly (LIAA). Published 106133 1A. Geomagnetismo e Paleomagnetismo JCR Journal

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