Investigations of texture formation in geomaterials by neutron diffraction with high pressure chambers |
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| Authors: | A. N. Nikitin W. A. Sukhoparov J. Heintz K. Walther |
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| Affiliation: | 1. Joint Institute for Nuclcar Research, Frank Laboratory of Neutron Physics , Dubna, Russia;2. Institute for High-Pressure Physics of the Russian Academy of Science , Troizk, Russia;3. Research Center Rosscntlorf, Institute of Ion Beam Physics arid Materials Research , Dresden, Germany |
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| Abstract: | Abstract This paper suggests a classification of texture in quartzitic rocks. Possible mechanisms of texture formation and their relation to tectonic processes are discussed. A scheme for the experimental varification of some models describing the evolution of deformation structures in geological materials in dependence on various erxternal conditions (high pressures, temperatures, various loadings, etc.) acting on a sample is proposed. To investigate “in situ” the mechanisms of texture formation in rocks, high pressure devices are under construction. They will be built of a special Ti ? Zr alloy, which has zero coherent scattering lenght and therefore is well suited for neutron diffraction investigations. Two different devices are proposed. The first one allows neutron diffraction measurements of sample volumes up to 4 cm3, a hydrostatic pressure of 1, 5 GPa, a temperature of 300° C, and uniaxial compression up to 50 kN. Pressure temperature and axial load are measured inside the chamber. Besides during the experiment, diagrams of load, elastic wave velocities and acoustic emission will be recorded. The second chamber is designed to investigate the mechanisms of texture formation in polycrystal samples (rocks or their imitations) at temperatures up to 800° C and axial compression with a force of up to 150 kN. |
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