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In situ stress-strain measurements in a deformation-DIA apparatus at P-T conditions of the upper part of the mantle transition zone

  • Takaaki Kawazoe EMAIL logo , Yu Nishihara , Tomohiro Ohuchi , Norimasa Nishiyama , Yuji Higo , Ken-ichi Funakoshi and Tetsuo Irifune
Published/Copyright: April 2, 2015
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Abstract

We report on technical improvements in experiments with a deformation-DIA (D-DIA) apparatus, which enable the study of the rheology of solid materials at P-T conditions of the Earth’s mantle transition zone. Dimensions of the anvil truncation, pressure medium, and gasket were optimized to achieve deformation experiments above 13 GPa with a relatively low press load (<0.7 MN) to minimize the damage of the X‑ray transparent second-stage anvils. The adoption of low X‑ray absorbing material (e.g., cubic BN anvils, graphite window in a LaCrO3 heater) along the X‑ray path enabled quantitative determination of stress and strain of a sample by means of simultaneous in situ X‑ray radial diffraction and radiography using synchrotron radiation at SPring-8. Based on the new technique, a uniaxial deformation experiment with a strain rate of 3.88 × 10−5 s−1 and strains up to 25.5% was carried out on wadsleyite at a pressure of 14.5 GPa and a temperature of 1700 K.

Received: 2011-2-27
Accepted: 2011-7-28
Published Online: 2015-4-2
Published in Print: 2011-11-1

© 2015 by Walter de Gruyter Berlin/Boston

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