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変成P-T経路の見積りにおける相平衡熱力学的フォワードモデリングの適用
https://ouj.repo.nii.ac.jp/records/8204
https://ouj.repo.nii.ac.jp/records/820443298a1c-3ef9-44a4-a78a-16733e6c32d2
名前 / ファイル | ライセンス | アクション |
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2014-09-05 | |||||
タイトル | ||||||
タイトル | 変成P-T経路の見積りにおける相平衡熱力学的フォワードモデリングの適用 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Application of Thermodynamic Forward-modeling to Estimation of a Metamorphic P-T Path | |||||
言語 | ||||||
言語 | jpn | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 埋没変成P-T経路 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | フォワードモデリング | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 超高圧変成岩 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 熱力学計算 | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 地質温度圧力計 | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | prograde_P-T_path | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | forward-modeling | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | ultrahigh-pressure_metamorphism | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | thermodynamic_calculation | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | geothermobarometry | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
大森, 聡一
× 大森, 聡一× 眞砂, 英樹 |
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著者別名 | ||||||
識別子Scheme | WEKO | |||||
識別子 | 10438 | |||||
姓名 | OMORI, Soichi | |||||
著者別名 | ||||||
識別子Scheme | WEKO | |||||
識別子 | 10439 | |||||
姓名 | MASAGO, Hideki | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | One of the important aims of metamorphic petrology is to unveil the physicochemical conditions of the Earth's interior. Decoding the record of metamorphism is a case of the inverse problem based on observations of stable equilibrium mineral assemblages and mineral compositions. Mineralogical forward-modeling is an alternative approach to estimate the metamorphic conditions of a rock. It enables a prediction of equilibrium composition of zoned minerals or mineral inclusions with the matrix phase assemblage. Thus, the forwardapproach tests the assumption of an equilibrium mineral assemblage, which is critical for inversion analysis.<BR>In this paper, we introduce thermodynamic forward-modeling in the field of metamorphic petrology. Then, we show an example of its application in estimating a prograde metamorphic P-T path of a whiteschist from the Kokchetav ultrahigh-pressure terrane in Kazakhstan. Garnet in the whiteschist shows prograde compositional zonation and contains mineral inclusions. We carried out geothermobarometric estimates using ilmenite-rutile composite inclusions in garnet, combined with an evaluation of the equilibrium mineral assemblage in a P-T pseudosection of the whiteschist in the K<SUB>2</SUB>O-CaO-MgO-FeO-Al<SUB>2</SUB>O<SUB>3</SUB>-SiO<SUB>2</SUB>-H<SUB>2</SUB>O system. The result yielded a counter-clockwise prograde P-T path for the rock. The amount and equilibrium composition of garnet were sequentially calculated for model P-T conditions along the P-T path, and the results were compared with a line-profile observation of the garnet. A consistency between the model and the observations was confirmed for X<SUB>Ca</SUB> in garnet, however X<SUB>Fe</SUB> and X<SUB>Mg</SUB> had a large inconsistency. Both uncertainties in the equilibrium model and nonequilibrium effects during the crystal growth are possible reasons for such a discrepancy. Hence, it must be noticed that there are complexities in estimating the equilibrium composition of a zoned garnet and matrix minerals. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | One of the important aims of metamorphic petrology is to unveil the physicochemical conditions of the Earth's interior. Decoding the record of metamorphism is a case of the inverse problem based on observations of stable equilibrium mineral assemblages and mineral compositions. Mineralogical forward-modeling is an alternative approach to estimate the metamorphic conditions of a rock. It enables a prediction of equilibrium composition of zoned minerals or mineral inclusions with the matrix phase assemblage. Thus, the forwardapproach tests the assumption of an equilibrium mineral assemblage, which is critical for inversion analysis.<BR>In this paper, we introduce thermodynamic forward-modeling in the field of metamorphic petrology. Then, we show an example of its application in estimating a prograde metamorphic P-T path of a whiteschist from the Kokchetav ultrahigh-pressure terrane in Kazakhstan. Garnet in the whiteschist shows prograde compositional zonation and contains mineral inclusions. We carried out geothermobarometric estimates using ilmenite-rutile composite inclusions in garnet, combined with an evaluation of the equilibrium mineral assemblage in a P-T pseudosection of the whiteschist in the K<SUB>2</SUB>O-CaO-MgO-FeO-Al<SUB>2</SUB>O<SUB>3</SUB>-SiO<SUB>2</SUB>-H<SUB>2</SUB>O system. The result yielded a counter-clockwise prograde P-T path for the rock. The amount and equilibrium composition of garnet were sequentially calculated for model P-T conditions along the P-T path, and the results were compared with a line-profile observation of the garnet. A consistency between the model and the observations was confirmed for X<SUB>Ca</SUB> in garnet, however X<SUB>Fe</SUB> and X<SUB>Mg</SUB> had a large inconsistency. Both uncertainties in the equilibrium model and nonequilibrium effects during the crystal growth are possible reasons for such a discrepancy. Hence, it must be noticed that there are complexities in estimating the equilibrium composition of a zoned garnet and matrix minerals. | |||||
書誌情報 |
地學雜誌 en : Journal of Geography (Chigaku Zasshi) 巻 113, 号 5, p. 647-663, 発行日 2004-10-25 |
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出版者 | ||||||
出版者 | 公益社団法人 東京地学協会 | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0022135X | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00322536 |