A model for gouge deformation - Implications for remanent magnetization

Details A model for gouge deformation - Implications for remanent magnetization A model for gouge deformation - Implications for remanent magnetization

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1499r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 14, p. 1499-1502.

Mathematics

Logic

6

Geological Faults, Magnetization, Rock Mechanics, Silicates, Deformation, Power Series, Remanence

Scientific paper

Using a two-dimensional construction for space-filling bearings (SFB) recently proposed by Herrmann et al. (1990), as an idealized description of the texture of gouge-like material, we study the effect of grain rotations in a shear band. The SFB model is by construction self-similar, and the disk-size distribution follows a power-law in good agreement with the observed particle-size distribution of natural gouges. The kinematics of the model is described by a single degree of freedom (i.e., each disk can only rotate, with no slip at the contact points). We investigate the isothermal remanent magnetization (IRM) reduction during such a cataclastic shearing. The problem can be solved analytically for this model. The magnetization loss, due to a disorientation of the grains can be shown to be a power law as a function of the shear. The exponent of the power law is simply related to the fractal dimension of the particle-size distribution in the gouge. This result may stimulate experimental investigations using IRM to gain new insight into the gouge texture and kinematics.

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