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Article Dans Une Revue Physics of the Earth and Planetary Interiors Année : 2010

Unraveling the simultaneous shock magnetization and demagnetization of rocks

Résumé

In the natural case of an hypervelocity impact on a planetary or asteroidal surface, two competing phenomena occur: partial or complete shock demagnetization of pre-existing remanence and acquisition of shock remanent magnetization (SRM). In this paper, to better understand the effects of shock on the magnetic history of rocks, we simulate this natural case through laser shock experiments in controlled magnetic field. As previously shown, SRM is strictly proportional to the ambient field at the time of impact and parallel to the ambient field. Moreover, there is no directional or intensity heterogeneity of the SRM down to the scale of ∼0.2mm. We also show that the intensity of SRM is independent of the initial remanence state of the rock. Shock demagnetization and magnetization appear to be distinct phenomena that do not necessarily affect identical populations of grains. As such, shock demagnetization is not a limiting case of shock magnetization in zero field.
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Dates et versions

hal-00675795 , version 1 (02-03-2012)

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J. Gattacceca, M. Boustie, E. Lima, B.P. Weiss, T. de Resseguier, et al.. Unraveling the simultaneous shock magnetization and demagnetization of rocks. Physics of the Earth and Planetary Interiors, 2010, 182 (1-2), pp.42. ⟨10.1016/j.pepi.2010.06.009⟩. ⟨hal-00675795⟩
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