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

Abe, Ryota; Shibazaki, Yuki; Ozawa, Seiji; Ohira, Itaru; Tobe, Hiromu; Suzuki, Akio

doi:10.2465/jmps.170714

Cited by 10 publications

(8 citation statements)

References 24 publications

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“…At relatively low temperatures of 1400 K and 1475 K, the back-scattered electron images and the compositional analyses of the recovered samples show the presence of δ-AlOOH and phase Egg in the bulk compositions of Al0.67−0.73 (Figure 1a; Table 1). This phase assemblage is confirmed by the corresponding XRD patterns (Figure 2a) and is consistent with the results reported by Abe et al (2018).…”

Section: Formation Of δ-Alooh−phase Egg Solid Solutionssupporting

confidence: 91%

“…The previous study might have misidentified the Al-rich phase Egg as aluminous phase D because of the similarities between these two phases in the Raman spectra (Figure S2) and chemical compositions. Our results are comparable to those of the previous studies (Abe et al 2018;Pamato et al 2015) that suggest that phase Egg is stable at the uppermost lower mantle. In addition, we found two unknown hydrous phases that are not identical to aluminous phase D, although the chemical compositions are considerably similar.…”

supporting

confidence: 92%

“…Many high-pressure hydrous phases have been found in the Al2O3-SiO2-H2O ternary system. Among them, δ-AlOOH (Suzuki et al 2000), phase Egg (Eggleton et al 1978), and aluminous phase D (Pamato et al 2015) are stable under the pressure and temperature conditions corresponding to the mantle transition zone and the uppermost lower mantle (Abe et al 2018;Fukuyama et al 2017). These phases are the key minerals for understanding the Earth's deep water cycle because they have been found as inclusions in superdeep diamonds (Kaminsky 2017;Wirth et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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

Takaichi

Nishi

Zhou

et al. 2023

American Mineralogist: Journal of Earth and Planetary Materials

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The stabilities of the minerals that can hold water are important for understanding the 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 diffraction 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 the phases can host large amount of water at least up to 2275 K, exceeding the typical mantle geotherm. The extreme thermal stability of hydrous aluminosilicates suggests that deepsubducted crustal rocks could be a possible reservoir of water in the mantle transition zone and the uppermost lower mantle.

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Section: Formation Of δ-Alooh−phase Egg Solid Solutionssupporting

confidence: 91%

supporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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

Takaichi

Nishi

Zhou

et al. 2023

American Mineralogist: Journal of Earth and Planetary Materials

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“…Hydrous ringwoodite with about 1.5 wt.% H 2 O 1 and phase egg 2–4 has been discovered in the diamond inclusions of mantle xenoliths. Ringwoodite is a high-pressure polymorph of olivine and a significant mineral in the mantle transition zone.…”

Section: Introductionmentioning

confidence: 99%

Hydrous magnesium-rich magma genesis at the top of the lower mantle

Nakajima

Sakamaki

Kawazoe

et al. 2019

Sci Rep

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Several igneous activities occur on the surface of the Earth, including island arcs, mid-ocean ridges and hot spots. Based on geophysical observations, melting phenomena in the interior also occur at the asthenosphere’s top and the upper mantle’s bottom. Additionally, a seismological low-velocity anomaly was observed at the top of the lower mantle that may result from mantle melting due to dehydration decomposition of ringwoodite to bridgmanite and ferropericlase with a downward flow. However, the corresponding high-pressure experimental data are too poor to understand the melting phenomena under the lower mantle condition. Herein, we conducted hydrous peridotite melting experiments at pressures from 23.5 to 26 GPa and at temperatures from 1300 to 1600 °C for demonstrating the melt composition and the gravitational stability of magma at the top of the lower mantle. The melt had a SiO 2 -poor and MgO-rich composition, which is completely different than that of dry peridotite melting experiments. Compared with the seismological lower mantle, the experimental melt is gravitationally lighter; thus, a similar melt could be observed as seismological low-velocity zone at the lower mantle’s top. The generated magma plays as a filter of down-welling mantle and can contribute to a formation of a silicate perovskitic lower mantle.

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“…Among these hydrous phases, phase Egg has the potential to carry water to mantle transition zone depths and as a result it has been subject of numerous investigations that elucidate its high-pressure and temperature stability and compressibility. Phase Egg was first synthesized above 10 GPa (Eggleton et al, 1978) and since then the thermodynamic stability have been investigated numerous times with the high-pressure limits ranging from 20 -30 GPa where phase Egg decomposes to δ-AlOOH and stishovite (Schmidt et al, 1998;Ono et al, 1999;Sano et a., 2004;Fukuyama et al, 2017;Abe et al, 2018). Phase Egg has also been found as inclusions in natural diamonds from Junia, Brazil indicating that crustal materials are indeed deeply subducted to the mantle transition zone and upper part of lower mantle (Wirth et al, 2007).…”

mentioning

confidence: 99%

Anomalous elastic behavior of phase Egg, AlSiO3(OH), at high pressures

2018

msam

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Phase Egg (AlSiO 3 (OH)), is an aluminosilicate hydrous mineral that is thermodynamically stable in lithological compositions represented by Al 2 O 3-SiO 2-H 2 O (ASH) ternary i.e., a simplified ternary for the mineralogy of subducted sediments and continental crustal rocks. High-pressure and high-temperature experiments on lithological compositions resembling hydrated sedimentary layers in subducting slabs show that phase Egg is stable up to pressures of 20-30 GPa which translates to transition zone to lower mantle depths. Thus phase Egg is a potential candidate for transporting water into the Earth's mantle transition zone. In this study, we use first-principles simulations based on density functional theory to explore the pressure dependence of crystal structure and how it influences energetics and elasticity. Our results indicate that phase Egg exhibits anomalous behavior of the pressure dependence of the elasticity at mantle transition zone depths (~ 15 GPa). Such anomalous behavior in the elasticity is related to changes in the This is a preprint, the final version is subject to change, of the American Mineralogist (MSA) Cite as Authors (Year) Title. American Mineralogist, in press.

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

Cited by 10 publications

References 24 publications

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

Hydrous magnesium-rich magma genesis at the top of the lower mantle

Anomalous elastic behavior of phase Egg, AlSiO3(OH), at high pressures

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