In situ X–ray diffraction studies of hydrous aluminosilicate at high pressure and temperature

• ABE Ryota

  Department of Earth Science, Graduate School of Science, Tohoku University

• SHIBAZAKI Yuki

  Frontier Research Institute for Interdisciplinary Sciences, Tohoku University

• OZAWA Shin

  Department of Earth Science, Graduate School of Science, Tohoku University

• OHIRA Itaru

  Department of Earth Science, Graduate School of Science, Tohoku University

• TOBE Hiromu

  Department of Earth Science, Graduate School of Science, Tohoku University

• SUZUKI Akio

  Department of Earth Science, Graduate School of Science, Tohoku University

Abstract

In situ X–ray diffraction studies of the phase relation of Al₂SiO₄(OH)₂ were conducted within a pressure range of 19.7–32.2 GPa and a temperature range of 800–1600 °C. We observed the coexistence of δ–AlOOH and stishovite at 31.0 GPa and 1500 °C and the formation of phase Egg together with corundum at 30.6 GPa and 1600 °C. Our results indicate that phase Egg is stable at least up to 31 GPa and 1600 °C and should be the important water carrier after the avalanche of the stagnant slab to a depth of approximately 900 km in the lower mantle.

Journal

• Journal of Mineralogical and Petrological Sciences

  Journal of Mineralogical and Petrological Sciences 113 (2), 106-111, 2018

  Japan Association of Mineralogical Sciences

Keywords

• Hydrous aluminosilicate
• Synchrotron X–ray diffraction
• Lower mantle
• Subducting slab

Details

• CRID: 1390282681521789184
• NII Article ID: 130006733782
• DOI: 10.2465/jmps.170714
• ISSN: 13493825
• ISSN: 13456296
• Web Site: https://www.jstage.jst.go.jp/article/jmps/113/2/113_170714/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed