Theoretical background of ARM correction in the Shaw palaeointensity method

Details Theoretical background of ARM correction in the Shaw palaeointensity method Theoretical background of ARM correction in the Shaw palaeointensity method

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.137..261t&link_type=abstract

Geophysical Journal International, Volume 137, Issue 1, pp. 261-265.

Astronomy and Astrophysics

Astronomy

6

Arm, Palaeointensity, Trm

Scientific paper

The theoretical background of ARM correction in Shaw's palaeointensity method was examined by a computer simulation. A case study using Jaep's ARM model, which is based on Néel's relaxation theory, was made for an ensemble of single-domain grains of magnetite which have a log-normal grain distribution (d=0.050 rommu m and barH_C=50 mT with a relative standard deviation of 36 per cent). Variations in the capacities of ARM and TRM were calculated when volume or coercivity was changed up to +/- 50 per cent. If the grain interaction effect is ignored in ARM, the change in ARM capacity due to a change in volume is almost identical to that of TRM. For a more realistic case with grain interaction effects in ARM, the change in capacity due to a change in volume is different in ARM and TRM, although the difference is about 6-7 per cent at most for a change of +/- 20 per cent in ARM capacity. When coercivity is changed, the difference is within about 5 per cent for the 20 per cent change in ARM capacity, although the difference is larger when grain interaction is ignored in ARM. It is suggested that ARM correction should be limited to those results in which the ratio of ARM1/ARM2 is moderately close to unity.

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