Authors
Goru Takaichi, Yu Nishihara, Kyoko N Matsukage, Masayuki Nishi, Yuji Higo, Yoshinori Tange, Noriyoshi Tsujino, Sho Kakizawa
Publication date
2024/8/15
Journal
Earth and Planetary Science Letters
Volume
640
Pages
118790
Publisher
Elsevier
Description
The stability of minerals that can hold water is important for understanding the distribution and transportation of water in the Earth's deep interior. Water distribution in the lower mantle depends on the stability of water-bearing minerals in the subducting slab because minerals in the surrounding lower mantle have low water solubility. Recent studies have reported that pure SiO2 high-pressure phases can hold large amounts of water (>3 wt%) however, their experimental results are contradictory regarding stability. In this study, the stability of hydrous SiO2 stishovite in a water-saturated system was investigated at pressures of 10–30 GPa and temperatures reaching 1300 °C by in situ X-ray observation using a multi-anvil apparatus. The experiments revealed that the unit-cell volume of stishovite was significantly greater than that of anhydrous stishovite (by 3.8 % at the maximum) below 700 °C in the studied range of …
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Scholar articles
G Takaichi, Y Nishihara, KN Matsukage, M Nishi… - Earth and Planetary Science Letters, 2024