RT Journal Article
T1 Preferred orientation of anorthite deformed experimentally in Newtonian creep
A1 Gómez Barreiro, Juan
A1 Lonardelli, I.
A1 Wenk, H.-R
A1 Dresen, G.
A1 Rybacki, E.
A1 Ren, Y.
A1 Tomé, C.N.
AB 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.
PB Elsevier
SN 0012-821X
YR 2007
FD 2007
LK https://hdl.handle.net/20.500.14352/104190
UL https://hdl.handle.net/20.500.14352/104190
LA eng
NO Barreiro, J. Gómez, et al. «Preferred Orientation of Anorthite Deformed Experimentally in Newtonian Creep». Earth and Planetary Science Letters, vol. 264, n.o 1-2, diciembre de 2007, pp. 188-207. DOI.org (Crossref), https://doi.org/10.1016/j.epsl.2007.09.018.
NO Department of Energy (United States)
NO National Science Foundation (United States)
NO Ministerio de Educación y Ciencia
DS Docta Complutense
RD 31 dic 2025