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High-temperature phase relations of hydrous aluminosilicates at 22 GPa in the AlOOH-AlSiO3OH system

High-temperature phase relations of hydrous aluminosilicates at 22 GPa in the AlOOH-AlSiO3OH system AbstractThe stabilities of the minerals that can hold water are important for understanding water behavior in the Earth’s deep interior. Recent experimental studies have shown that the incorporation of aluminum enhances the thermal stabilities of hydrous minerals significantly. In this study, the phase relations of hydrous aluminosilicates in the AlOOH-AlSiO3OH system were investigated at 22 GPa and 1400–2275 K using a multi-anvil apparatus. Based on the X-ray difraction measurements and composition analysis of the recovered samples, we found that the AlSiO4H phase Egg forms a solid solution with δ-AlOOH above 1500 K. Additionally, at temperatures above 1800 K, two unknown hydrous aluminosilicates with compositions Al2.03Si0.97O6H2.03 and Al2.11Si0.88O6H2.11 appeared, depending on the bulk composition of the starting materials. Both phases can host large amounts of water, at least up to 2275 K, exceeding the typical mantle geotherm. The extreme thermal stability of hydrous aluminosilicates suggests that deep-subducted crustal rocks could be a possible reservoir of water in the mantle transition zone and the uppermost lower mantle. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png American Mineralogist de Gruyter

High-temperature phase relations of hydrous aluminosilicates at 22 GPa in the AlOOH-AlSiO3OH system

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Publisher
de Gruyter
Copyright
© 2023 by Mineralogical Society of America
ISSN
0003-004X
eISSN
1945-3027
DOI
10.2138/am-2022-8429
Publisher site
See Article on Publisher Site

Abstract

AbstractThe stabilities of the minerals that can hold water are important for understanding water behavior in the Earth’s deep interior. Recent experimental studies have shown that the incorporation of aluminum enhances the thermal stabilities of hydrous minerals significantly. In this study, the phase relations of hydrous aluminosilicates in the AlOOH-AlSiO3OH system were investigated at 22 GPa and 1400–2275 K using a multi-anvil apparatus. Based on the X-ray difraction measurements and composition analysis of the recovered samples, we found that the AlSiO4H phase Egg forms a solid solution with δ-AlOOH above 1500 K. Additionally, at temperatures above 1800 K, two unknown hydrous aluminosilicates with compositions Al2.03Si0.97O6H2.03 and Al2.11Si0.88O6H2.11 appeared, depending on the bulk composition of the starting materials. Both phases can host large amounts of water, at least up to 2275 K, exceeding the typical mantle geotherm. The extreme thermal stability of hydrous aluminosilicates suggests that deep-subducted crustal rocks could be a possible reservoir of water in the mantle transition zone and the uppermost lower mantle.

Journal

American Mineralogist – de Gruyter

Published: May 1, 2023

Keywords: Water; hydrous phase; mantle transition zone; phase Egg; phase transition; Physics and Chemistry of Earth’s Deep Mantle and Core

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