High temperature stability limit of phase egg, AlSiO 3 (OH)

Ono, Shigeaki

doi:10.1007/s004100050583

Cited by 67 publications

(37 citation statements)

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“…The stability of topaz-OH is restricted to lower temperatures compared to the results of Wunder et al (1993). The reaction topaz-OH + stishovite = phase egg is shifted to lower pressures compared to the results of Schmidt et al (1998) and higher pressures compared with those of Ono (1999) for the SiO 2 -Al 2 O 3 -H 2 O system. The near-solidus phase relations of hydrous phases in our experiments are schematically shown in Fig.…”

Section: Phase Relationshipsmentioning

confidence: 56%

“…Our experiments are relevant to such a scenario and provide insight into phase equilibria in subduction zones at high CO 2 and H 2 O contents. Figure 1 shows the phase relations observed in our experiments and some reactions controlling the stability of hydrous phases in model systems with a pure H 2 O fluid (Wunder et al 1993;Schmidt and Poli 1994;Schmidt et al 1998;Ono 1999). The dehydration reactions are displaced in our experiments compared to the CASH system because of the lower water activity and the presence of additional components (Fig.…”

Section: Phase Relationshipsmentioning

confidence: 82%

“…8a together with the range for volatile-free systems (silicate melts) and for silicocarbonate melts in equilibrium with clinopyroxene in peridotitic bulk compositions. Compared to these partition coefficients, our Ono (1999). The solidus of carbonated pelite (GS11) is after Grassi and Schmidt (2011b).…”

Section: Clinopyroxenementioning

confidence: 98%

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Reduced sediment melting at 7.5–12 GPa: phase relations, geochemical signals and diamond nucleation

Brey

Гирнис

Bulatov

et al. 2015

Contrib Mineral Petrol

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garnet. Clinopyroxene stability depends strongly on the Na content in the starting mixture; it remains in the Na-gloss composition up to 1600 °C at 12 GPa, but was not observed in K-gloss experiments above 1200 °C. The composition of melt or fluid changes gradually with increasing temperature from hydrous carbonate-rich (<10 wt% SiO 2 ) at 800-1000 °C to volatile-rich silicate liquids (up to 40 wt% SiO 2 ) at high temperatures. Trace elements were analyzed in melts and crystalline phases by LA ICP MS. The garnetmelt and clinopyroxene-melt partition coefficients are in general consistent with results from the literature for volatile-free systems and silicocarbonate melts derived by melting carbonated peridotites. Most trace elements are strongly incompatible in kyanite and silica polymorphs (D < 0.01), except for V, Cr and Ni, which are slightly compatible in kyanite (D > 1). Aragonite and Fe-Mg carbonate have very different REE partition coefficients (D Mst-Sd/L ~ 0.01 and D Arg/L ~ 1). Nb, Ta, Zr and Hf are strongly incompatible in both carbonates. The bearthite/melt partition coefficients are very high for LREE (>10) and decrease to ~1 for HREE. All HFSE are strongly incompatible in bearthite. In contrast, Ta, Nb, Zr and Hf are moderately to strongly compatible in ZrSiO 4 and TiO 2 phases. Based on the obtained partition coefficients, the composition of a mobile phase derived by sediment melting in deep subduction zones was calculated. This phase is strongly enriched in incompatible elements and displays a pronounced negative Ta-Nb anomaly but no Zr-Hf anomaly. Although all experiments were conducted in the diamond stability field, only graphite was observed in low-temperature experiments. Spontaneous diamond nucleation and the complete transformation of graphite to diamond were observed at temperatures above 1200-1300 °C. We speculate that the observed character of graphite-diamond transformation is controlled by relationships between the kinetics of metastable graphite Abstract Melting of carbonated sediment in the presence of graphite or diamond was experimentally investigated at 7.5-12 GPa and 800-1600 °C in a multianvil apparatus. Two starting materials similar to GLOSS of Plank and Langmuir (Chem Geol 145:325-394, 1998) were prepared from oxides, carbonates, hydroxides and graphite. One mixture (Na-gloss) was identical in major element composition to GLOSS, and the other was poorer in Na and richer in K (K-gloss). Both starting mixtures contained ~6 wt% CO 2 and 7 wt% H 2 O and were doped at a ~100 ppm level with a number of trace elements, including REE, LILE and HFSE. The near-solidus mineral assemblage contained a silica polymorph (coesite or stishovite), garnet, kyanite, clinopyroxene, carbonates (aragonite and magnesite-siderite solid solution), zircon, rutile, bearthite and hydrous phases (phengite and lawsonite at <9 GPa and the hydrous aluminosilicates topaz-OH and phase egg at >10 GPa). Hydrous phases disappear at ~900 °C, and carbonates persist up to 1000-1100 °C. At temperatures >1200 °C, the ...

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Section: Phase Relationshipsmentioning

confidence: 56%

Section: Phase Relationshipsmentioning

confidence: 82%

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Reduced sediment melting at 7.5–12 GPa: phase relations, geochemical signals and diamond nucleation

Brey

Гирнис

Bulatov

et al. 2015

Contrib Mineral Petrol

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“…Since then, the fully hydrated endmember of topaz, Al 2 SiO 4 (OH) 2 , is termed topaz-OH. The stability of topaz-OH in the Al 2 O 3 − SiO 2 − H 2 O-system has been reported at pressures between 5.5 and 13 GPa and temperatures up to 1,500 • C (Wunder et al 1993;Ono 1999). Topaz-OH is suggested to be an important water carrier in pelitic sediments and basaltic rocks, which are subducted to depths below 150 km (Schreyer 1995;Schmidt 1995;Domanik and Holloway 1996;Ono 1998).…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the OH-stretching frequencies in topaz-OH

Watenphul

Wunder

2009

Phys Chem Minerals

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Hydrogen bonding in topaz-OH, Al 2 SiO 4 (OH) 2 , was investigated by IR spectroscopic analysis of the temperature dependence of the OH-stretching frequencies. Low-temperature spectra ranging from -196 to -160 • C prove the existence of four non-equivalent H-positions in the crystal structure from the occurrence of four different OH-bands. With increasing temperature, these bands merge first, above -160 • C, into two OH-bands and then above 400 • C into one asymmetric broad band. Shifting of the OH-bands is caused by thermally induced hydrogen order-disorder. Low temperature fixes the protons in their positions; increasing temperature induces proton movement and allows switching between the different positions. Autocorrelation analysis of the IR spectra reveals two phase transitions, one at about -155 • C from P1 to Pbn2 1 characterized as static-dynamic change and the second at about 380 • C from Pbn2 1 to Pbnm caused by disordering of the protons. The increasing symmetry with temperature is due to advanced proton movement and dynamical averages over the proton distribution densities.

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“…In fact, phase Egg has been found in natural diamonds as inclusions together with δ-AlOOH and stishovite (Wirth et al, 2007;Kaminsky, 2017), implying the possibility of water transportation into the deep mantle via hydrous aluminosilicate phases. Phase Egg was synthesized above 10 GPa and at approximately 1000°C by Eggleton et al (1978) and has been reported to be stable up to 20-24 GPa (Ono, 1999;Sano et al, 2004;Fukuyama et al, 2017). Wunder et al (1993) first synthesized topaz-OH at pressures higher than 5.5 GPa.…”

Section: Introductionmentioning

confidence: 99%

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

Abe

Shibazaki

Ozawa

et al. 2018

Journal of Mineralogical and Petrological Sciences

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In situ X-ray diffraction studies of the phase relation of Al 2 SiO 4 (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.

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High temperature stability limit of phase egg, AlSiO 3 (OH)

Cited by 67 publications

References 0 publications

Reduced sediment melting at 7.5–12 GPa: phase relations, geochemical signals and diamond nucleation

Reduced sediment melting at 7.5–12 GPa: phase relations, geochemical signals and diamond nucleation

Temperature dependence of the OH-stretching frequencies in topaz-OH

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

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