| Project/Area Number |
22244069
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geochemistry/Astrochemistry
|
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
IWAMORI Hikaru 東京工業大学, 大学院・理工学研究科, 教授 (80221795)
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|---|
| Co-Investigator(Kenkyū-buntansha) |
YOKOYAMA Tetsuya 東京工業大学, 理工学研究科, 准教授 (00467028)
HIRATA Takafumi 京都大学, 理学(系)研究科(研究院), 教授 (10251612)
NAKAMURA Hitomi 東京工業大学, 理工学研究科, 特任助教 (60572659)
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| Project Period (FY) |
2010 – 2012
|
| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥48,880,000 (Direct Cost: ¥37,600,000、Indirect Cost: ¥11,280,000)
Fiscal Year 2012: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2010: ¥43,160,000 (Direct Cost: ¥33,200,000、Indirect Cost: ¥9,960,000)
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| Keywords | 地殻 / マントル化学 / 沈み込み / 不均質 / 沈み込み帯 / マントル / 組成異常 / スラブ / 流体 / マグマ / 組成 / 独立成分 |
|---|
| Research Abstract |
We have successfully estimated the mantle isotopic compositions and their global distribution, based on the compositions of arc volcanic rocks, by evaluating the slab-derived components. A combined analysis with oceanic basalts has revealed for the first time the presence of east-west hemispherical structure: the mantle in the eastern hemisphere is enriched in subducted hydrophile components, being possibly brought into the mantle by focused subduction towards the supercontinent once existed in the eastern hemisphere, whereas that in the western hemisphere is not.
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