Anisotropy of compressional wave velocities, complex electrical resistivity and magnetic susceptibility of mylonites from the deeper crust and their relation to the rock fabric

Details Anisotropy of compressional wave velocities, complex electrical resistivity and magnetic susceptibility of mylonites from the deeper crust and their relation to the rock fabric Anisotropy of compressional wave velocities, complex electrical resistivity and magnetic susceptibility of mylonites from the deeper crust and their relation to the rock fabric

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.105..247s&link_type=abstract

Earth and Planetary Science Letters, Volume 105, Issue 1-3, p. 247-259.

Physics

6

Scientific paper

Laboratory measurements of compressional wave velocities (VP) complex electrical resistivity and magnetic susceptibility have been carried out on a mylonitic clinopyroxene amphibolite (MCA) and an epidote-muscovite-quartz ultramylonite (MQU) from the Ivrea Zone. Both mylonites exhibit significant anisotropies that are related to the rock fabric. At low pressure of about 50 MPa the anisotropy of VP for the MCA and MQU is 17 and 34%, respectively. It is due to oriented microcracks (intragranular, transgranular, grain boundary cracks and cleavage cracks), in addition to preferred orientation of anisotropic rock-forming minerals. At high pressure (600 MPa) where most of the cracks are closed a residual anisotropy of about 10 and 12%, respectively, is observed, that is mainly controlled by preferred orientations of mineral constituents.
The anisotropies of the complex electrical resistivity measured with an electrolyte (tap water) at 0.1 MPa are 40 and 36% for the MCA and MQU, whereas at 80 MPa these values increase to 44% for both samples. In contrast, measured with an electrolyte of 0.1 M NaCl solution the resistivity is lower and gives anisotropies of 71% (MCA) and 63% (MQU) at 0.1 MPa.
The anisotropies of the magnetic susceptibility (AMS) are about 27% (MCA) and 14% (MQU). For both mylonites the axes of the AMS ellipsoid coincide with the macroscopic fabric elements, where the main axis of magnetic susceptibility (Kmax) lies approximately parallel to the lineation.
An intercorrelation of the different physical properties in terms of rock composition and anisotropic rock fabric is difficult. Nevertheless, the laboratory determination of anisotropic in-situ physical properties provide more objective data for the modelling of in-situ crustal conditions.

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