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oai:docta.ucm.es:20.500.14352/1041902024-05-17T23:49:03Zcom_20.500.14352_14col_20.500.14352_15

Preferred orientation of anorthite deformed experimentally in Newtonian creep Gómez Barreiro, Juan Lonardelli, I. Wenk, H.-R Dresen, G. Rybacki, E. Ren, Y. Tomé, C.N. 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. 2024-05-17T17:59:57Z 2024-05-17T17:59:57Z 2007 journal article 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. 0012-821X 10.1016/j.epsl.2007.09.018 https://hdl.handle.net/20.500.14352/104190 1385-013X https://doi.org/10.1016/j.epsl.2007.09.018 eng DOE-BES (DEFG02-05ER15637) NSF (EAR-0337006) MEC (#EX-2005-0490) restricted access Elsevier