Preferred orientation of anorthite deformed experimentally in Newtonian creep

Details Preferred orientation of anorthite deformed experimentally in Newtonian creep Preferred orientation of anorthite deformed experimentally in Newtonian creep

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007e%26psl.264..188g&link_type=abstract

Earth and Planetary Science Letters, Volume 264, Issue 1-2, p. 188-207.

Mathematics

Logic

7

Scientific paper

Synthetic anorthite aggregates were deformed in a Paterson gas deformation apparatus at confining pressures up to 400 MPa in torsion and axial compression at temperatures between 950 °C and 1200 °C. Samples deformed in torsion under Newtonian creep display development of texture (or crystallographic preferred orientation) as documented with synchrotron X-ray diffraction measurements. Complex diffraction patterns were deconvoluted with the Rietveld method to obtain quantitative texture information. Torsion samples deformed up to shear strains of 4 and samples deformed in compression at higher stresses to total strains of 0.3 develop clear textures. Texture and shape preferred orientation (SPO) of torsion samples display a monoclinic pattern with an asymmetry inclined against the sense of shear, consistent with polycrystal plasticity simulations that assume the deformation is accomplished by dislocation glide. These results show that a material deforming in linear-viscous creep can develop a strong texture, in striking contrast to the paradigm that the presence of a texture precludes low-stress Newtonian behavior. Our observations show that the presence or absence of crystallographic preferred orientation is not sufficient to uniquely infer the dominant rheological/mechanical regime, as sometimes applied for interpretation of seismic anisotropy in the Earth.

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