Multidomain behavior in paleointensity experiments

Details Multidomain behavior in paleointensity experiments Multidomain behavior in paleointensity experiments

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....3052c&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #3052

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Scientific paper

Dacitic lava from the summit of Mt. Lassen in northern California, erupted in 1915 in a known field, exhibits highly non-ideal behavior in paleointensity experiments. Thellier experiments conducted on 11 samples from 8 cores yielded continuously curved Arai diagrams that were either concave up or S-shaped (first concave up, then concave down), but the mean paleointensity derived from the slopes of straight lines drawn through the initial and final points is very close to the correct value. The initial slopes were almost always steeper than the ideal straight line, whereas the final slope was sometimes shallower and sometimes steeper. The departures were often large, with maximum and minimum slopes for a single sample corresponding to field intensities 100 percent or more too high and 30 percent too low. This behavior cannot be explained by alteration of magnetic minerals during heating in the laboratory, but instead suggests a multidomain (MD) mechanism. The Fabian (2001) phenomenological theory of MD pTRM can account elegantly for the concave up portions of the Arai diagrams, but not for the concave-down portions. We suggest that the latter behavior could be caused by the tail of pTRM*, that is, the tail with unblocking temperature greater than the blocking temperature of the pTRM produced during each Thellier step by heating to an intermediate temperature and cooling back down to room temperature in the laboratory field. Fabian, K., 2001, A theoretical treatment of paleointensity determination experiments on rocks containing pseudo-single or multidomain magnetic particles, Earth Planet. Sci. Lett. 188, 45-55.

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