Effects of experimental deformation on the remanent magnetization of sediments

Details Effects of experimental deformation on the remanent magnetization of sediments Effects of experimental deformation on the remanent magnetization of sediments

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...58..255p&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 58, Issue 2-3, p. 255-266.

Physics

10

Scientific paper

Changes in direction and in intensity of the remanent magnetization of sediments were studied during experimental deformation leading to an axial shortening of 20-30%. The remanence was produced before shortening by anhysteretic magnetization in an alternating field of 90 mT superimposed on a parallel steady field of 1 mT at various inclinations with respect to the sample. The samples were sandstones, marls and volcanic sediments.
The results show that the direction of magnetization is stable during the deformation within the experimental precision. The intensity of magnetization decreases during shortening by an amount which depends on the type of rock: about 30% for sandstones and about 5% for marls and volcanic sediments. The March model does not account for the data and a discontinuous deformation must be invoked.
The evolution of the Young modulus of sandstones during cyclic loading and unloading shows first a decrease in relation to crack density growth, then an increase showing a localization of the fracturation and finally a deformation by displacement of microblocks.
An interpretation is given after a discussion of the results obtained by other authors with plasticine and artificial clays. The amplitude of the decrease and of the rotation of the remanent magnetization could be a function of the size of the magnetic grains compared with the scale of the fracturation during non-homogeneous processes of deformation.

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