Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 46608 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Orientation distribution function of biotite platelets based on optical, thin sections and $\mu$-CT image analysis in an Outokumpu (Finland) biotite gneiss: Comparison with neutron diffraction texture analysis Orientation distribution function of biotite platelets based on optical, thin sections and $\mu$-CT image analysis in an Outokumpu (Finland) biotite gneiss: Comparison with neutron diffraction texture analysis Duliu Octavian G Duliu Octavian G Ivankina Tatiana I Ivankina Tatiana I Herman Edward Herman Edward Ricman Calin Ricman Calin Tiseanu Ion Tiseanu Ion University of Bucharest, Faculty of Physics ru University of Bucharest, Faculty of Physics ru Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research ru Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research ru University of Bucharest, Doctoral School of Physics ru University of Bucharest, Doctoral School of Physics ru Geological Institute of Romania, National Museum of Geology ru Geological Institute of Romania, National Museum of Geology ru National Institute for Laser, Plasma and Radiation Physics ru National Institute for Laser, Plasma and Radiation Physics ru 16 3 1 6 29 10 2021 https://rjes.ru/en/nauka/article/46608/view

The results of the neutron diffraction investigation were compared with similar results obtained by analysing more $\mu$-CT, high resolution photographic and thin section images of a cylindrical sample of the textured Outokumpu (Finland) biotite gneiss. All data were interpreted by means of corresponding orientation distribution function (ODF). Both Rayleigh $R$ test of uniformity and Rao's $U$ test for homogeneity of the corresponding ODF confirmed the existence of a real anisotropic distribution of mineralogical phases within investigated specimens. Together with the neutron diffraction pole figures, ODF, unambiguously proved the existence of a lattice as well as of the shape preferred orientations of the mineralogical components of the complex Outokumpu gneiss.

The results of the neutron diffraction investigation were compared with similar results obtained by analysing more $\mu$-CT, high resolution photographic and thin section images of a cylindrical sample of the textured Outokumpu (Finland) biotite gneiss. All data were interpreted by means of corresponding orientation distribution function (ODF). Both Rayleigh $R$ test of uniformity and Rao's $U$ test for homogeneity of the corresponding ODF confirmed the existence of a real anisotropic distribution of mineralogical phases within investigated specimens. Together with the neutron diffraction pole figures, ODF, unambiguously proved the existence of a lattice as well as of the shape preferred orientations of the mineralogical components of the complex Outokumpu gneiss.

 Outokumpu mica gneiss neutron diffraction computed tomography foliation lineation orientation distribution function Outokumpu mica gneiss neutron diffraction computed tomography foliation lineation orientation distribution function

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