The reactions between iron and magnesite at 6 GPa and 1273–1873 K: Implication to reduction of subducted carbonate in the deep mantle
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- MARTIROSYAN Naira S.
- Novosibirsk State University V.S. Sobolev Institute of Geology and Mineralogy, SB RAS
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- LITASOV Konstantin D.
- Novosibirsk State University V.S. Sobolev Institute of Geology and Mineralogy, SB RAS
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- SHATSKIY Anton
- Novosibirsk State University V.S. Sobolev Institute of Geology and Mineralogy, SB RAS
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- OHTANI Eiji
- Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University
抄録
The interaction between Fe–metal and magnesite was studied in multianvil experiments at 6 GPa and 1273–1873 K using different capsule materials: Fe, BN, and MgO. It was observed that at subsolidus conditions reaction proceeds with the formation of Fe3C and magnesiowüstite in the stoichiometric proportions according to relation: MgCO3 + 5Fe = 3(Fe0.66Mg0.33)O + Fe3C. At melting conditions (1673–1873 K) magnesite and iron react in nearly equivalent molar proportions with formation of Mg–Fe–carbonatite melt, Fe–C alloy, magnesiowüstite and graphite. The reactions clearly show that free carbon and metallic iron phases cannot coexist in the upper mantle and presumably in transition zone and will always form Fe–carbide. The carbon content in Fe–C alloy and its coexistence with diamond will be strongly dependent on the oxygen fugacity. The studied reactions can be considered as intermediate processes in the reduced mantle domains at the contact with submerging subduction slabs and have further implication to the processes at the core–mantle boundary.
収録刊行物
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 110 (2), 49-59, 2015
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681521485184
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- NII論文ID
- 130005067160
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- ISSN
- 13493825
- 13456296
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可