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RESEARCH REPORT: MAGNETIC INVESTIGATIONS AND THE AGE OF A MEDIEVAL KILN AT KUNGAHÄLLA (SOUTH-WEST SWEDEN)

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The results from a magnetic survey and archaeomagnetic investigation of a medieval brick kiln at Kungahälla in Bohuslän (south-west Sweden) are reported. Detailed magnetic total field and magnetic gradient measurements over known traces of the kiln showed marked local magnetic anomalies of up to 200 nT, revealing the rectangular shape of the kiln remains.

 Palaeomagnetic investigations of the remanent magnetization of 12 bricks from the kiln floor gave precise definitions of both the direction of the archaeomagnetic field [(Dm, Im) = (66.7°, 8.8°), k = 655, α95= 1.7°] and the palaeointensity [Bm= 69.0 ± 3.6 µT]. An archaeomagnetic date is obtained by comparing the direction of the archaeomagnetic field found in the kiln with a geocentral dipole-transformation of the British master-curve for secular variation. Of two possible archaeomagnetic dates (ad1280 ± 50 orad1480 ± 50), thead1280 ± 50 age is in good accordance with the C-14 ages and archaeological dates as well as with direct historical evidence, whereas a c. 100 years younger TL date appears to be too young.
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Keywords: ARCHAEOMAGNETISM; DATING; KILN; MEDIEVAL; PALAEOINTENSITY; SCANDINAVIA; SURVEYING

Document Type: Research Article

Affiliations: 1: Department of Earth Sciences, Aarhus University, Finlandsgade 8, DK-8200 Århus N, Denmark. 2: Directorate for Cultural Heritage, District Office North, Kjøpmannsgata 25, N-7013 Trondheim, Norway

Publication date: November 1, 2003

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