Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmgp72a0992f&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #GP72A-0992
Other
1521 Paleointensity
Scientific paper
The ratio of Natural Remanent Magnetization (NRM) to saturation Isothermal Remanent Magnetization (IRMs) of a rock is dependent upon the magnetic material in it, the mechanism of magnetization, and the field in which the rock is magnetized. In calibration experiments, a variety of rocks given Thermal Remanent Magnetization (TRM) in a field of order 0.01 mT gave ratios of NRM:IRMs of order 0.01, when the NRM and IRMs were demagnetized to 20mT to eliminate the effect of very soft multidomain material. The method was initially used with lunar samples because standard methods that involved heating the samples proved impossible, whereas many analyses had presented the critical values of NRM and IRMs after 20mT. In this case, to know the field to an order of magnitude was important and led to the notion that there was a strong field on the moon, comparable with the geomagnetic field, from about 3.9 to 3.6 Gyr (Cisowski and Fuller 1986). Similarly, it is useful to know the martian field in which NRM was acquired by ALH84001 at 4.0 Gyr was one order less than the geomagnetic field, as has been suggested by studies of that meteorite. Clearly, the method is a simple normalization and should not be relied upon as anything more.
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