Physics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....8911573b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Dec. 10, 1984, p. 11573-11579. NASA-supported research.
Physics
3
Basalt, Coercivity, Lunar Rocks, Remanence, Thermal Cycling Tests, Analogs, Demagnetization, Iron, Magnetic Effects, Microcracks, Thermal Stresses
Scientific paper
An experimental study has been performed to determine whether stresses associated with thermal cycling cracks can affect the coercivity of remanence carried by iron in lunar samples. Initially, samples were cycled up to 100 times in a refrigerator over a period of about 30 min per cycle. In a second set of experiments, samples were dipped directly into liquid nitrogen up to 100 times at about 1 min per cycle. Comparison of AF demagnetization curves of weak field anhysteretic remanent magnetization before and after cycling revealed no systematic differences. Calculations based on a model of spherical iron grains within olivine or troilite indicate that it is unlikely that the iron will crack under thermal stress. Thus, thermal cycling does not appear to provide an explanation for increasing the stability of remanence in samples from the lunar surface.
Barron A. M.
Shive Peter N.
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