Physics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...71..189m&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 71, Issue 3-4, p. 189-204.
Physics
6
Scientific paper
Alternating field (AF) demagnetization of chondritic samples often shows anomalous results such as large directional and intensity changes; `saw-tooth' intensity vs. demagnetizing field curves are also prevalent. An attempt to explain this behaviour is presented, using a computer model in which individual `mineral grains' can be `magnetized' in a variety of different ways. A simulated demagnetization can then be carried out to examine the results.
It was found that the experimental behaviour of chondrites can be successfully mimicked by loading the computer model with a series of randomly orientated and sized vectors. The parameters of the model can be changed to reflect different trends seen in experimental data.
Many published results can be modelled using this method. A known magnetic mineralogy can be modelled, and an unknown mineralogy deduced from AF demagnetization curves. Only by comparing data from mutually orientated samples can true stable regions for palaeointensity measurements be identified, calling into question some previous estimates of field strength from meteorites.
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