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They occur as an isolated phase and sometimes show intergrowth texture with ilmenite. Most rutile grains contain up to 3.7 wt.% Nb2O5, which shows positive correlations with Fe and trivalent elements. Niobium substitutes for Ti by a coupled substitution with the trivalent cations (M3^+) of Nb^5+M^3+Ti^4+ -2. Fine-grained rutile grains included in ilmenite are distinctly poor in Nb (\u003c0.1 wt.% as Nb2O5) and contain Fe of 1.7–3.2 wt.% as Fe2O3, suggesting vacancybearing substitution of Fe^3+ 4 Ti^4+ -3□–1, where □ indicates a vacancy. The rutile grains in the felsic phases contain high Zr contents of up to 4200 ppm, suggesting equilibrium temperatures over 800°C using the Ti-in-rutile geothermometer. These high-temperature conditions are consistent with those estimated by conventional methods reported in the literature and suggest widespread occurrences of the upperamphibolite and granulite facies metamorphic rocks in the middle segment of the Mogok metamorphic belt. 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A mechanism for Nb incorporation in rutile and application of Zr-in-rutile thermometry: A case study from granulite facies paragneisses of the Mogok metamorphic belt, Myanmar
http://hdl.handle.net/2237/00027998
http://hdl.handle.net/2237/0002799849a970cb-d270-490e-a33b-d4a166955164
名前 / ファイル | ライセンス | アクション |
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MMW2017 (2.7 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2018-05-17 | |||||
タイトル | ||||||
タイトル | A mechanism for Nb incorporation in rutile and application of Zr-in-rutile thermometry: A case study from granulite facies paragneisses of the Mogok metamorphic belt, Myanmar | |||||
言語 | en | |||||
著者 |
Maw Maw Win
× Maw Maw Win× Enami, M.× Kato, T.× Ye Kyaw Thu |
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アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
権利 | ||||||
言語 | en | |||||
権利情報 | This article has been published in a revised form in [Mineralogical Magazine] [https://doi.org/10.1180/minmag.2017.081.014]. This version is free to view and download for private research and study only. Not for re-distribution, re-sale or use in derivative works. © 2017 The Mineralogical Society of Great Britain and Ireland. | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | niobium | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | zirconium | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | rutile | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Mogok metamorphic rock | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Myanmar | |||||
抄録 | ||||||
内容記述 | Rutile grains occur extensively in host phases of biotite and quartz-feldspar aggregate in high-temperature paragneisses of the Mogok metamorphic belt of Myanmar. They occur as an isolated phase and sometimes show intergrowth texture with ilmenite. Most rutile grains contain up to 3.7 wt.% Nb2O5, which shows positive correlations with Fe and trivalent elements. Niobium substitutes for Ti by a coupled substitution with the trivalent cations (M3^+) of Nb^5+M^3+Ti^4+ -2. Fine-grained rutile grains included in ilmenite are distinctly poor in Nb (<0.1 wt.% as Nb2O5) and contain Fe of 1.7–3.2 wt.% as Fe2O3, suggesting vacancybearing substitution of Fe^3+ 4 Ti^4+ -3□–1, where □ indicates a vacancy. The rutile grains in the felsic phases contain high Zr contents of up to 4200 ppm, suggesting equilibrium temperatures over 800°C using the Ti-in-rutile geothermometer. These high-temperature conditions are consistent with those estimated by conventional methods reported in the literature and suggest widespread occurrences of the upperamphibolite and granulite facies metamorphic rocks in the middle segment of the Mogok metamorphic belt. In contrast, the Zr contents of rutile grains in biotite are usually <1000 ppm, implying equilibrium temperatures lower than 750°C. Most of the rutile grains poorer in Zr might have been included in biotite and were isolated from the zircon-bearing system during an early stage of prograde metamorphism. Some other rutile grains poorer in Zr might have been an exsolved phase from Ti-rich biotite during retrograde metamorphism, which was furthered by the infiltration of metamorphic fluid under lower-amphibolite facies conditions. | |||||
言語 | en | |||||
内容記述タイプ | Abstract | |||||
内容記述 | ||||||
内容記述 | Published online: 26 January 2018 | |||||
言語 | en | |||||
内容記述タイプ | Other | |||||
内容記述 | ||||||
内容記述 | ファイル公開:2018-07-26 | |||||
言語 | ja | |||||
内容記述タイプ | Other | |||||
出版者 | ||||||
言語 | en | |||||
出版者 | Cambridge University Press | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプresource | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
出版タイプ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1180/minmag.2017.081.014 | |||||
ISSN | ||||||
収録物識別子タイプ | PISSN | |||||
収録物識別子 | 0026-461X | |||||
書誌情報 |
en : Mineralogical Magazine 巻 81, 号 06, p. 1503-1521, 発行日 2017-12 |
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著者版フラグ | ||||||
値 | author |