Experimental study of Fe3+ solubility in cristobalite and its application to a metamorphosed quartz-magnetite rock from Mt. Riiser-Larsen area, Napier Complex, East Antarctica

Kawasaki, Toshisuke; Ishizuka, Hiroki

doi:10.2465/jmps.080216

Cited by 20 publications

(3 citation statements)

References 25 publications

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“…Quartz in ultrahigh-temperature granulites has been shown to contain small amounts of Fe and Ti (Kawasaki & Ishizuka 2008;Kawasaki & Osanai 2008). In the rocks from Skallevikshalsen, the trace element chemistry of quartz, especially Fe and Ti content, differs between matrix quartz and quartz inclusions within garnet (see Table 5).…”

Section: Quartzmentioning

confidence: 99%

Possible armalcolite pseudomorph-bearing garnet–sillimanite gneiss from Skallevikshalsen, Lützow-Holm Complex, East Antarctica: Implications for ultrahigh-temperature metamorphism

Kawasaki

Adachi

Nakano

et al. 2013

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A possible armalcolite pseudomorph has been identified in garnet-sillimanite gneiss from Skallevikshalsen, located c. 30 km NE of Rundvågshetta, in a terrane with the highest metamorphic grade in the Lützow-Holm Complex, East Antarctica. It occurs as an Fe-Mg-Ti compositional domain consisting of ilmenite, rutile and pseudorutile, partially mantled by rutile within ilmenite. The domain yields an average X Mg of 0.171 + 0.036 exceeding by 3 wt% TiO 2 from armalcolite stoichiometry, while the analysis closest to armalcolite stoichiometry has an X Mg value close to 0.202. Host ilmenite with 0.4 mol% hematite is in contact with prismatic sillimanite, quartz, plagioclase and K-feldspar.In run products of annealing experiments performed to investigate the origin of the pseudomorph, armalcolite-ilmenite reaction coronae were developed around relict rutile in rock fragments of quartz eclogite from the Higashi-Akaishi mass of the Sanbagawa belt, central Shikoku, Japan. The experiments were carried out at 1 atm and 960-1050 8C with wüstite-magnetite buffer and imply a minimum temperature of 1290 8C for armalcolite stability when extrapolated to Skallevikshalsen pressures of 1.0 GPa. Mineral chemistry thermobarometry for Skallevikshalsen yields a metamorphic path with P-T peak conditions of 0.88-1.1 GPa and 970-1050 8C, followed by retrograde metamorphism at 0.6 GPa and 780 8C, and finally metasomatic alteration at c. 630 8C. This P -T path matches that for similar ultrahigh-temperature metamorphic rocks from Rundvågshetta and Sri Lanka, and is markedly lower in temperature than the unreasonable estimates based on armalcolite stability. This discrepancy is inferred to reflect chemical impurities in armalcolite that lower its minimum temperature stability by more than 200 8C.

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Section: Quartzmentioning

confidence: 99%

Possible armalcolite pseudomorph-bearing garnet–sillimanite gneiss from Skallevikshalsen, Lützow-Holm Complex, East Antarctica: Implications for ultrahigh-temperature metamorphism

Kawasaki

Adachi

Nakano

et al. 2013

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“…The efficiency in cristobalite transformation may be due to the presence of argon in the atmosphere [32] or to the slow heating profile. [33] In particular, looking at the microstructure of reacted lumps of quartz at 1923 K (1650°C), amorphous areas can be found (Table IV; Figure 1). The transformation process of quartz into cristobalite takes place right up to 1923 K (1650°C).…”

Section: A Quartz Microstructure During Heatingmentioning

confidence: 99%

“…[40] The solubility of the impurities in cristobalite is therefore higher than in quartz, which stimulates partial decomposition of mineral phase and dissolution of its constituents into cristobalite. Kawasaki [33] reported that the solubility of Fe 3+ in cristobalite increases with increasing temperature. Diffusion of K, Al, and Fe into the cristobalite structure is shown in Figure 5.…”

Section: A Quartz Microstructure During Heatingmentioning

confidence: 99%

Trace Elements in the Si Furnace. Part I: Behavior of Impurities in Quartz During Reduction

Martello

Tranell

Ostrovski

et al. 2013

Metall Mater Trans B

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Quartz and carbonaceous materials, which are used in the production of silicon as well as electrodes and refractories in the silicon furnace, contain trace elements mostly in the form of oxides. These oxides can be reduced to gaseous compounds and leave the furnace or stay in the reaction products-metal and slag. This article examines the behavior of trace elements in hydrothermal quartz and quartzite in the reaction of SiO2 with Si or SiC. Mixtures of SiO2 (quartz or quartzite), SiC, and Si in forms of lumps or pellets were heated to 1923 K and 2123 K (1650°C and 1850°C) in high purity graphite crucibles under Argon gas flow. The gaseous compounds condensed in the inner lining of the tube attached to the crucible. The phases present in the reacted charge and the collected condensates were studied quantitatively by X-ray diffraction (XRD) and qualitatively by Electron Probe Micro Analyzer (EPMA). Contaminants in the charge materials, reacted charge and condensate were analyzed by Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS). Muscovite in the mineral phase of quartz melted and formed two immiscible liquid phases: an Al-rich melt at the core of the mineral, and a SiO2-rich melt at the mineral boundaries. B, Mn, and Pb in quartz were removed during heating in reducing atmosphere at temperature above 1923 K (1650°C). Mn, Fe, Al and B diffused from quartz into silicon. P concentration was under the detection limit. Quartzite and hydrothermal quartz had different initial impurity levels: quartzite remained more impure after reduction experiment but approached purity of hydrothermal quartz upon silica reduction. Trace Elements in the Si Furnace. Part I: Behavior of Impurities in Quartz During Reduction ELENA DAL MARTELLO, GABRIELLA TRANELL, OLEG OSTROVSKI, GUANGQING ZHANG, OLA RAANESS, RUNE BERG LARSEN, KAI TANG, and PRAMOD KOSHY Quartz and carbonaceous materials, which are used in the production of silicon as well as electrodes and refractories in the silicon furnace, contain trace elements mostly in the form of oxides. These oxides can be reduced to gaseous compounds and leave the furnace or stay in the reaction products-metal and slag. This article examines the behavior of trace elements in hydrothermal quartz and quartzite in the reaction of SiO 2 with Si or SiC. Mixtures of SiO 2 (quartz or quartzite), SiC, and Si in forms of lumps or pellets were heated to 1923 K and 2123 K (1650°C and 1850°C) in high purity graphite crucibles under Argon gas flow. The gaseous compounds condensed in the inner lining of the tube attached to the crucible. The phases present in the reacted charge and the collected condensates were studied quantitatively by X-ray diffraction (XRD) and qualitatively by Electron Probe Micro Analyzer (EPMA). Contaminants in the charge materials, reacted charge and condensate were analyzed by Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS). Muscovite in the mineral phase of quartz melted and formed two immiscible liquid phases: an Al-rich melt at the core of the mineral, and a SiO ...

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Experimental Phase Equilibria Studies in the FeO-Fe2O3-CaO-SiO2 System in Air: Results for the Iron-Rich Region

Cheng

Shevchenko

Hayes

et al. 2020

Metall Mater Trans B

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Experimental study of Fe3+ solubility in cristobalite and its application to a metamorphosed quartz-magnetite rock from Mt. Riiser-Larsen area, Napier Complex, East Antarctica

Cited by 20 publications

References 25 publications

Possible armalcolite pseudomorph-bearing garnet–sillimanite gneiss from Skallevikshalsen, Lützow-Holm Complex, East Antarctica: Implications for ultrahigh-temperature metamorphism

Possible armalcolite pseudomorph-bearing garnet–sillimanite gneiss from Skallevikshalsen, Lützow-Holm Complex, East Antarctica: Implications for ultrahigh-temperature metamorphism

Trace Elements in the Si Furnace. Part I: Behavior of Impurities in Quartz During Reduction

Experimental Phase Equilibria Studies in the FeO-Fe2O3-CaO-SiO2 System in Air: Results for the Iron-Rich Region

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