Preferred orientation in experimentally deformed stishovite: implications for deformation mechanisms

• Published in: Physics and chemistry of minerals Vol. 42; no. 4; pp. 275 - 285
• Main Authors: Kaercher, Pamela M., Zepeda-Alarcon, Eloisa, Prakapenka, Vitali B., Kanitpanyacharoen, Waruntorn, Smith, Jesse S., Sinogeikin, Stanislav, Wenk, Hans-Rudolf
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.04.2015; Springer Nature B.V; Springer
• Subjects: Ambient temperature; Crystal structure; Crystallography; Crystallography and Scattering Methods; Deformation; Deformation mechanisms; diamond anvil cell; Diamond anvil cells; Diffraction patterns; Earth and Environmental Science; Earth Sciences; Flint; Geochemistry; High pressure; high pressure/stress; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Laser beam heating; MATERIALS SCIENCE; Mineral Resources; Mineralogy; Original Paper; Preferred orientation; Silicon dioxide; Slip; slip systems; Stishovite; Diamond anvil cell; Stishovite; Preferred orientation; High pressure/stress; Slip systems
• ISSN: 0342-1791; 1432-2021
• DOI: 10.1007/s00269-014-0718-5

Although the crystal structure of the high-pressure SiO 2 polymorph stishovite has been studied in detail, little is known about the development of crystallographic preferred orientation (CPO) during deformation in stishovite. Insight into CPO and associated deformation mechanics of stishovite would provide important information for understanding subduction of quartz-bearing crustal rocks into the mantle. To study CPO development, we converted a natural sample of flint to stishovite in a laser-heated diamond anvil cell and compressed the stishovite aggregate up to 38 GPa. We collected diffraction patterns in radial geometry to examine in situ development of crystallographic preferred orientation and find that (001) poles preferentially align with the compression direction. Viscoplastic self-consistent modeling suggests the most likely slip systems at high pressure and ambient temperature are pyramidal and basal slip.