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• W2036822148 abstract "Abstract The crystalch emistry and crystal structure of naturalky anite crystals from the Eclogitic Micaschists Complex of the Sesia-Lanzo Zone, Western Italian Alps, have been investigated by means of optical microscopy, wavelength dispersive X-ray microanalysis, and single-crystal X-ray diffraction. The association of kyanite + garnet + phengitic-mica + chloritoid suggests that the eclogite-facies stages occurred at P ≤ 2.1 GPa and T ≤ 650ºC. Kyanite grains are large (cm-sized) porphyroblasts grown dynamically during one of the deformational events related to the subduction of the Austroalpine continentalcr ust. Under the polarizing microscope, kyanite grains show almost homogeneous cores, whereas rims are sometimes symplectitic aggregates of quartz and kyanite, confirming at least two stages of growth most likely related to the multistage deformational history of these rocks. Chemical analysis shows that Fe 3+ is the major substituting cation for Al 3+ , ranging between 0.038 and 0.067 a.p.f.u. The single-crystal X-ray diffraction investigation of the kyanites shows severely textured patterns on the ( h 0 l ) * -plane. Such evidence is not observed in the unwarped diffraction patterns on (0 kl ) * and ( hk 0) * . The most significant difference between the structuralp arameters refined in this study, with respect to those of previously published unstrained gem-quality crystals, concerns the displacement parameters. The anisotropic displacement ellipsoids of all the atomic sites are significantly larger than those previously described, and systematically oriented with the largest elliptical section almost perpendicular to [010]. The larger ellipsoids in the kyanite crystal investigated here reflect the displacement of the centre of gravity of the electron distribution, rather than an anomalous atomic thermal motion. The magnitude and orientation of the displacement parameters and the textured/strained diffraction pattern may be the result of two combined effects: (1) that the kyanite crystals are actually composed of several blocks; (2) the crystals are affected by a pervasive residual strain, as a result of tectonometamorphic plastic deformations and re-crystallization." @default.
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• W2036822148 date "2009-06-01" @default.
• W2036822148 modified "2023-09-24" @default.
• W2036822148 title "Plastic deformations in kyanites by tectonometamorphic processes: a single-crystal X-ray diffraction study" @default.
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• W2036822148 doi "https://doi.org/10.1180/minmag.2009.073.3.359" @default.
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