On correction of loss of mass during Thellier experiments |
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| Authors: | Elisabeth Schnepp |
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| Institution: | a Institut für Geophysik, Herzberger Landstrasse 180, 37075 Göttingen, Germany
b GGA-Institut, Arbeitsbereich Grubenhagen, OT Rotenkirchen, 37574 Einbeck, Germany |
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| Abstract: | Determination of geomagnetic paleointensity by the Thellier method compares the decay of natural remanent magnetisation with the gain of a laboratory induced thermoremanent magnetisation. If fragile samples lose some amount of their material after each heating step, the Thellier experiment will be systematically disturbed and paleointensity will be over-estimated. For a lost of 5% of the sample’s mass an over-estimate of 10% in paleointensity is observed. This can easily be corrected by a normalisation to the initial mass of the unheated sample. This is necessary for any fragile materials such as baked clays or when a specimen breaks into pieces during the Thellier experiment. |
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| Keywords: | Paleointensity Archaeomagnetism Thellier experiment |
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