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Supermagnetic enhancement, superparamagnetism, and archaeological soils

✍ Scribed by Clare Peters; Roy Thompson

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
137 KB
Volume
14
Category
Article
ISSN
0883-6353

No coin nor oath required. For personal study only.

✦ Synopsis

A range of mineral magnetic measurements have been carried out on archaeological sediments from Orkney and Cyprus. In a soil profile from Orkney, a magnetic enhancement factor of over 200 is observed in susceptibility data between the bedrock and a Norse sediment. The magnetic enhancement is associated with an increase in superparamagnetic grains probably caused by burning. Until now it has proved difficult to confirm the presence of superparamagnetic grains in natural samples using room temperature magnetic measurements. However, clear differences are to be found between the hysteresis loops of various magnetic domain states, including superparamagnetism. An algorithm has been developed to unmix hysteresis loops in terms of constituent domain states of ferrimagnetic iron oxides. Unmixing 128 hysteresis loops of archaeological sediments has shown that the dominant domain state in all sediments is superparamagnetic. Remarkably uniform superparamagnetic grain sizes of between 80 and 95 A ˚were found for all 128 sediments.

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