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Datation par archéomagnétisme des terres cuites archéologiques en France au premier millénaire av. J.-C. : étalonnage des variations du champ géomagnétique en direction et intensité

Abstract : This study aims to improve the Western Europe secular variation curve of the direction (inclination I and declination D) and the intensity (F) of the Earth’s magnetic field during the first millennium BC. New archaeomagnetic reference data were obtained from 47 kilns, hearths and sets of pottery sherds with precise magnetization acquisition ages determined through a comprehensive review of available archaeological and chronometric informations. 39 new archaeodirections were computed after thermal and alternating field demagnetizations and 18 new archaeointensities were determined by the Thellier-Thellier protocol with anisotropy and cooling rate corrections. The new French secular variation curves, built using hierarchical bayesian statistics, were extended to 1500BC for the direction and to 800BC for the intensity. Inclination vary non-monotonously (between 65 and 75°) between 1500BC and 0AD. Variations in declination and intensity are very strong with a maximum at 800BC (30° for D and 90µT for F) and a minimum at 250BC (-5° for D and 60µT for F). Interpreting the geomagnetic significance of this strong variation is hindered by the scarcity of data outside Europe. However it provides a useful marker for reliable archaeomagnetic dating in Western Europe during the Iron Age, especially during the Early Iron Age thanks to the strong secular variation. The new directional curve also allows the extension of archaeomagnetic dating to the Final Bronze Age.
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Submitted on : Wednesday, October 3, 2012 - 2:50:32 PM
Last modification on : Thursday, January 14, 2021 - 11:44:59 AM
Long-term archiving on: : Friday, January 4, 2013 - 3:58:22 AM

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  • HAL Id : tel-00738129, version 1

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Gwenaël Hervé. Datation par archéomagnétisme des terres cuites archéologiques en France au premier millénaire av. J.-C. : étalonnage des variations du champ géomagnétique en direction et intensité. Archéologie et Préhistoire. Université Michel de Montaigne - Bordeaux III, 2012. Français. ⟨NNT : 2012BOR30011⟩. ⟨tel-00738129⟩

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