Time-domain magnetization of soiIs (VRM), experimental relationship to quadrature susceptibility - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Geophysics Année : 1993

Time-domain magnetization of soiIs (VRM), experimental relationship to quadrature susceptibility

Michel Dabas

Résumé

A comparison is made between measurements with a multichannel bipolar pulsed-induction meter (PIM) and measurements made with a phase-sensitive susceptibility bridge on more than 21 1 soil samples from a variety of archaeological sites in Europe. Eddy currents originating from the decay of viscous remanent magnetization (VRM) were measured with the PIM. The in-phase and out-of-phase (K,) magnetic mass sus-ceptibilies were measured with the susceptibility bridge. Viscous remanent magnetization was measured through eight time sampling intervals on the pulsed-induction meter, and the linearity of VRM for selected samples was tested at various field strengths (200 to 2300 pT). It is believed that this extension of the reversible range indicates a high coercive strength of the magnetic grains in the soil samples involved. Whatever the origin of the soil sample, a constant decay of VRM with time was observed between 56 and 417 ps, after switching off the inducing field. This relation is shown to be a power law with exponent-1.4. This roughly agrees with a theoretical model that takes into account a finite-energizing time of the transmitter pulse and single-domain (SD) behavior of particles. Finally, a comparison is made between VRM and quadrature susceptibility (K,). This comparison is in accordance with well dispersed single-domain theory, and was found to be a linear relationship.
Fichier principal
Vignette du fichier
1993, Time domain magnetization of soil, experimental relationship to quad susceptibility.pdf (361.39 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02926431 , version 1 (31-08-2020)

Identifiants

  • HAL Id : hal-02926431 , version 1

Citer

Michel Dabas, John R Skinner. Time-domain magnetization of soiIs (VRM), experimental relationship to quadrature susceptibility. Geophysics, 1993, 58 (3). ⟨hal-02926431⟩
22 Consultations
52 Téléchargements

Partager

Gmail Facebook X LinkedIn More