| Project/Area Number |
25400516
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | Ehime University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
大和田 正明 山口大学, 創成科学研究科, 教授 (50213905)
志村 俊昭 山口大学, 創成科学研究科, 教授 (70242451)
永嶌 真理子 山口大学, 創成科学研究科, 准教授 (80580274)
齊藤 哲 愛媛大学, 理工学研究科(理学系), 講師 (00528052)
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | アーマルコライト / イルメナイト / ルチル / シュードブルッカイト / ウルボスピネル / 超高温変成作用の指標鉱物 / 高温高圧再現実験 / 酸素分圧 / 酸素分圧センサー / 地質温度計圧力計 / 圧力センサー / Fe-Mg-Ti酸化鉱物 / 超高温変成作用 / 東南極ナピア岩体リーセルラルセン山 / 変成温度圧力履歴 / チタン－鉄酸化物 |
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| Outline of Final Research Achievements |
This is the report of the investigation to clarify the P-T conditions for the armalcolite stability field through the high-pressure experiments at pressures 6～12 kbar and temperatures 900～1100℃ corresponding to the ultrahigh-temperature metamorphic conditions under controlling the oxygen fugacity (logPO2=-10～-11). In the TiO2-FeO-MgO system with bulk of 0.15<XMg<0.2, we found that the assemblage of armalcolite + ilmenite + rule is stable at 8 kbar and more than 900～950℃. This indicates Fe-rich armalcolite would be stable at pressures and temperatures conditions corresponding to the ultrahigh-temperature metamorphism under oxdising conditions (logPO2=-10～-11). We conclude the Fe-rich armalcolite would be a new index mineral for ultrahigh-temperature metamorphism.
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