Abstract
The study of magnetization of the ceramic material from 21 archeological monuments of Portugal (the Evora province), dated archeologically from the Bronze Age to the end of the Iron Age has been carried out. For the purpose of more detailed timing of the material from the monuments the method of ceramic age dating on the basis of its porosity has been used. In order to take into account the distorted factors in the determination of the parameters of the ancient geomagnetic field with the aim of the maximal approximation to the actual values the diagnostic features of magnetite weathering have been considered and the level of weathering of the magnetic fraction in the ceramics from archeological monuments has been determined. The data of geomagnetic field-strength variation in the time interval of the 12th century BC to the beginning of the Common Era have been obtained. The field-strength at this time interval varied in the range of 60–90 micro Tesla with the maximal values in the 9th, 8th, and the second half of the 5th to the beginning of the 4th century BC. In addition, the timing of the ceramic material from the urns of the megalithic complex Monte de Tera of the Evora province has been clarified.
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Original Russian Text © I.E. Nachasova, K.S. Burakov, 2009, published in Fizika Zemli, 2009, No. 7, pp. 54–62.
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Nachasova, I.E., Burakov, K.S. Variation of the intensity of the Earth’s magnetic field in Portugal in the 1st millennium BC. Izv., Phys. Solid Earth 45, 595–603 (2009). https://doi.org/10.1134/S1069351309070040
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DOI: https://doi.org/10.1134/S1069351309070040