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Authors: | Caricchi, Chiara* Campuzano, Saioa Arquero* Sagnotti, Leonardo* Macrì, Patrizia* Lucchi, Renata Giulia* |
Title: | Reconstruction of the Virtual Geomagnetic Pole (VGP) path at high latitude for the last 22 kyr: The role of radial field flux patches as VGP attractor | Journal: | Earth and Planetary Science Letters | Series/Report no.: | /595 (2022) | Publisher: | Elsevier | Issue Date: | 2022 | DOI: | 10.1016/j.epsl.2022.117762 | Keywords: | geomagnetic paleosecular variation relative paleointensit flux lobes Levantine Iron Age Anomaly marine sediment cores arctic region |
Subject Classification: | solid earth paleomagnetism |
Abstract: | Reconstruction of geomagnetic field changes has a strong potential to complement geodynamo modeling and improve the understanding of Earth’s core dynamics. Recent works based on geomagnetic measure-ments pointed out that over the last two decades the position of the north magnetic pole has been largely determined by the influence of two competing flux lobes under Canada and Siberia. In order to understand if the waxing and waning of magnetic flux lobes have driven the path of geo-magnetic paleopoles in the past, we present an augmented and updated record of the chronology and paleosecular variation of geomagnetic field for the last 22 kyr derived from sedimentary cores collected along the north-western margin of Barents Sea and western margin of Spitsbergen (Arctic). The path of the virtual geomagnetic pole (VGP) has been reconstructed over this time period and compared with the maps of the radial component of the geomagnetic field at the core-mantle boundary, obtained from the most recent models. The VGP path includes centuries during which the VGP position is stable and cen-turies during which its motion accelerates. We recognize both clockwise and counterclockwise VGP paths, mostly developing inside the surface projection of the inner core tangent cylinder in the Arctic region. The VGP path seems to follow the appearance of Brpatches of normal magnetic flux, especially those located under Siberia and Canada areas, but also those that may cause peculiar paleomagnetic features such as the Levantine Iron Age Anomaly. |
Appears in Collections: | Article published / in press |
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File | Description | Size | Format | Existing users please Login |
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Caricchi_et_al_2022.pdf | Restricted Paper | 5.37 MB | Adobe PDF | |
Caricchi_et_al_Manuscript.pdf | Preprint version | 3.03 MB | Adobe PDF | View/Open |
Supplementary_Material.pdf | Supplementary material_Normalization method for relative paleointensity curves and models Figs. S1to S8. | 8.18 MB | Adobe PDF | View/Open |
Table_S1_Cores information and age models.xlsx | Table S1. Details of sedimentary cores (Spreadsheet 1), age models (Spreadsheet 2) and tie points (Spreadsheet 3). | 996.06 kB | Microsoft Excel XML | View/Open |
Table_S2_FCF_global and Canadian-Siberian hemispheres.xlsx | Table S2. Global Flux Concentration Factor (FCF) calculated for maps in Figs.7, 8, S7 and S8. | 10.83 kB | Microsoft Excel XML | View/Open |
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