Understanding the solid solution effects of iron on the thermoelasticity and thermal conductivity of the lower mantle minerals
| Project/Area Number |
26287137
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial 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 |
Tsuchiya Taku 愛媛大学, 地球深部ダイナミクス研究センター, 教授 (70403863)
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| Co-Investigator(Kenkyū-buntansha) |
土屋 旬 愛媛大学, 地球深部ダイナミクス研究センター, 准教授 (00527608)
出倉 春彦 愛媛大学, 地球深部ダイナミクス研究センター, 助教 (90700146)
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| Co-Investigator(Renkei-kenkyūsha) |
DEKURA Haruhiko 愛媛大学, 地球深部ダイナミクス研究センター, 講師 (90700146)
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| Research Collaborator |
HASE Atsushi
ICHIKAWA Hiroki
WANG Xianlong
XIONG Zhihua
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2016: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2015: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
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| Keywords | 第一原理計算 / 熱弾性特性 / 熱伝導特性 / 鉄固溶効果 / 下部マントル / 含水鉱物 / 下部マントル組成 |
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| Outline of Final Research Achievements |
Original approaches to compute thermoelasticity and thermal conductivity were developed based on the harmonic and anharmonic lattice dynamics theories combined with the internally-consistent DFT+U method, high-pressure and high-temperature elasticities and lattice thermal conductivities of iron and aluminum bearing bridgmanite (Br), ferropericlase (Fp), and post-perovskite (PPv) were calculated. It was found that the pyrolitic composition can reproduce seismological properties observed in the lower mantle and that Fp has thermal conductivity several times larger than the others. The techniques were also applied to iron hydroxide, and then a new high-pressure phase with the pyrite structure was successfully discovered. These results propose new pictures of the mantle dynamics that Earth's mantle is now in the whole convection state, where the upper and lower mantles convect integrally, and the surface water can be transported down to the bottom of the mantle located at 2890 km depth.
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Report
(4 results)
Research Products
(120 results)
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[Journal Article] Constraints on Earth's inner core composition inferred from measurements of the sound velocity of hcp-iron in extreme conditions2016
Author(s)
T. Sakamaki, E. Ohtani, H. Fukui, S. Kamada, S. Takahashi, T. Sakairi, A. Takahata, T. Sakai, S. Tsutsui, D. Ishikawa, R. Shiraishi, Y. Seto, T. Tsuchiya, and A. Q. R. Baron
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Journal Title
Science Advances
Volume: 2
Issue: 2
Pages: 2-2
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] J. Tsuchiya2016
Author(s)
High pressure transition of FeOOH in the lower mantle
Organizer
Deep Carbon Observatory Extreme Physics and Chemistry Group 2016 Workshop
Place of Presentation
Stanford University (Stanford, USA)
Related Report
Int'l Joint Research
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[Presentation] フェロペリクレースのフォノン軟化2015
Author(s)
福井宏之, バロン アルフレッド, 土屋卓久, 芳野極, 小林寿夫, 大石泰生
Organizer
第56回高圧討論会
Place of Presentation
JMSアステールプラザ （広島県広島市）
Year and Date
2015-11-12
Related Report
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[Presentation] 第２大陸の役割2014
Author(s)
河合研志, 市川浩樹, 山本伸次, 土屋卓久, 丸山茂徳
Organizer
日本地球惑星科学連合
Place of Presentation
横浜市
Year and Date
2014-04-29
Related Report
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