The effect of shock on the magnetism of terrestrial rocks

Details The effect of shock on the magnetism of terrestrial rocks The effect of shock on the magnetism of terrestrial rocks

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.3441c&link_type=abstract

Journal of Geophysical Research, vol. 83, July 10, 1978, p. 3441-3458.

Physics

45

Meteorite Craters, Remanence, Rocks, Shock Loads, Coercivity, Earth (Planet), Impact Loads, Pressure Effects

Scientific paper

Experimental projectile impacts into solid intrusive rocks are studied, and it is shown that shock pressures on the order of tens of kilobars are sufficient to affect the natural remanent magnetism of terrestrial materials. In addition to the demagnetization of the preexisting remanence, an additional component of remanence is produced; the direction of this remanence is related to the ambient field direction at the time of impact. The low-coercivity fraction is more sensitive than the higher-coercivity fractions to magnetic resetting by shock. Low-remanent-coercive-force igneous rocks, besides being more disposed toward magnetic recording of low-pressure shock events, are also apparently capable of recording the remanent field of a magnetized projectile at the time of impact. The remanent magnetism of rocks from meteorite craters are examined, and the effect of shock on remanent magnetism in lunar samples is considered.

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