Improving our knowledge of rapid geomagnetic field intensity changes observed in Europe between 200 and 1400 AD

Gomez-Paccard, Miriam; Chauvin, Annick; Lanos, Philippe; Dufresne, Philippe; Kovacheva, Meri; Hill, Mimi; Beamud, E; Blain, Sophie; Bouvier, Armel; Guibert, Pierre

doi:10.1016/j.epsl.2012.08.037

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Improving our knowledge of rapid geomagnetic field intensity changes observed in Europe between 200 and 1400 AD

Gomez-Paccard, Miriam; Chauvin, Annick; Lanos, Philippe et al.

2012 • In Earth and Planetary Science Letters, 355-356, p. 131–143

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https://hdl.handle.net/2268/175993

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10.1016/j.epsl.2012.08.037

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Keywords :

archaeomagnetism; archaeointensity; secular variation; dipole moment; Thellier; Europe

Abstract :

[en] vailable archaeomagnetic data indicate that during the past 2500 yr there have been periods of rapid geomagnetic field intensity fluctuations interspersed with periods of almost constant field strength. Despite Europe being the most widely covered region in terms of archaeomagnetic data the occurrence and the behaviour of these rapid geomagnetic field intensity changes is under discussion and the challenge now is to precisely describe them. The aim of this study is to obtain an improved description of the sharp intensity change that took place in western Europe around 800 AD as well as to investigate if this peak is observed at the continental scale. For this purpose 13 precisely dated early medieval Spanish pottery fragments, four archaeological French kilns and three collections of bricks used for the construction of different French historical buildings with ages ranging between 335 and 1260 AD have been studied. Classical Thellier experiments performed on 164 specimens, and including anisotropy of thermoremanent magnetisation and cooling rate corrections, gave 119 reliable results. The 10 new high-quality mean archaeointensities obtained confirm the existence of an intensity maximum of ∼85 μT (at the latitude of Paris) centred at ∼800 AD and suggest that a previous abrupt intensity change occurred around 600 AD. Together with previously published data from western Europe that we deem to be the most reliable, the new data also suggest the existence of two other abrupt geomagnetic field intensity variations during the 12th century and around the second half of the 13th century AD. High-quality archaeointensities available from eastern Europe indicate that very similar geomagnetic field intensity changes occurred in this region. European data indicate that very rapid intensity changes (of at least 20 μT/century) took place in the recent history of the Earth's magnetic field. The results call for additional high-quality archaeointensities obtained from precisely dated samples and for a selection of the previously published data if a refined description of geomagnetic field intensity changes at regional scales is to be obtained.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Gomez-Paccard, Miriam

Chauvin, Annick

Lanos, Philippe

Dufresne, Philippe

Kovacheva, Meri

Hill, Mimi

Beamud, E

Blain, Sophie ; Université de Liège - ULiège > Département des sciences historiques > Labo de dendrochronologie

Bouvier, Armel

Guibert, Pierre

Language :

English

Title :

Improving our knowledge of rapid geomagnetic field intensity changes observed in Europe between 200 and 1400 AD

Publication date :

15 November 2012

Journal title :

Earth and Planetary Science Letters

ISSN :

0012-821X

eISSN :

1385-013X

Publisher :

Elsevier Science, Amsterdam, Netherlands

Volume :

355-356

Pages :

131–143

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://hal.archives-ouvertes.fr/insu-00790431/

Available on ORBi :

since 08 January 2015

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