2013 Fiscal Year Final Research Report
Study on high-pressure and temperature elasticity of subducted crustal materials and lower mantle chemical heterogeneity
| Project/Area Number |
23540560
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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/Science of ore deposit
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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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| Project Period (FY) |
2011 – 2013
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| Keywords | 第一原理電子状態計算 / 沈み込んだ地殻物質 / 下部マントルの不均質性 |
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| Research Abstract |
The density and elasticity of the major crustal minerals in the deep mantle pressure condition were determined using the density functional first principles computation method. Based on the calculated results, potential subduction of the crustal materials into the deep mantle, their stable distribution in the mantle, and influences on the mantle dynamics were discussed.
It was found that each typical crustal material could reach the lowermost mantle and cause the chemical heterogeneity, but their stable stratification is less likely when considering the time scale of the basal heating from the outer core and the internal heating. Instead they would likely be involved in the global mantle convection. This suggests that while the crust formation is a differentiation process of the mantle, the subduction generally serves as an assimilation process.
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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
Year and Date
2014-04-29
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[Presentation] 第2大陸2011
Author(s)
河合研志, 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
幕張
Year and Date
2011-05-23
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